10mm vs .357 mag Underwood Xtreme Penetrators for Bear Protection? 

I appreciate seeing another RU-vid channel that actually treats 10mm with respect and gives credibility to the caliber instead of acting like 10mm is only a niche round. In my opinion, 10mm is actually a beast of a round, it has a rather flat trajectory, plenty of power, and some very impressive ballistic performance. It seems almost as if 10mm can do it all and is almost perfect in every way, but that's just my opinion though.

It's all about breaking bones and incapacitation not bleeding out. 10 mm, more rounds. Hard cast, flat faced with frac capability. Chest rig and spray. When you're face down, hoping she's going to let go, spray had a way of making you taste bad. The best way to survive a bear encounter is to not have one!

When I was in Alaska about a decade ago, our guide had 3 guns with him. A 10mm 1911, a S&W .500 and a 12ga loaded with solid copper slugs. He said he preferred the 10mm because of the capacity. That’s mostly what he carried while we were fishing. He actually fired a warning shot when a bear got too close. That bear high tailed it away from the creek and we went back to the seaplane lol

Another great video and I am a .357 guy

Clearly waiting 14 weeks for a 7 inch KKM barrel is well worth the wait. If being attacked One could get twice as many rounds of with the Glock than with the revolver, unless you are Jerry Miculek.Thank you for this up load.Nice Job.

For me the 10mm with heavy hard cast would be the way to. I cast so I would be able to match the load and practice with the same power ammo for much cheaper that would slow me more practice. Plus I know how well I shoot a revolver compared to how well I shoot a semi. Another cool video dude thanks for taking the time to do it

After watching you and Chuke I went to the G40. I’ve got both hard cast and penetrators. I really like the penetrators. This is rapidly becoming my favorite handgun especially for hunting and hiking.

I personally think 9mm+P+, 40+P, 357 mag, 45+p and 10mm are all great choices. Bullet type seems to me to be far more important than the caliber of the weapon.

If had to choose: 10mm in a G20… But either way those rounds would put more than a dint on a bear

Another excellent video Chuck. You know I am a fan of the .357 mag, but 16 rounds of 10mm would be fine for me too. The big difference I noted between the two rounds was at the end of the video. The price difference printed on the boxes! On a side note - congrats on getting the 4 wheeler up and running!

I've noticed that the newer made ammo is having more issues like primer falling out , powder amount incorrect ect. I think is cause they running to fast trying meet demands. So for new ammo check them out very good and expect possible failers of done kind.

That's a great looking gp100 you got there! I'm in Anchorage as well and also have a stainless 4" gp100 and 2 g20's 1 g40! I keep all my 10mm's loaded with Underwood hard cast the gp100 stays in the safe.

I chest carry a S&W TRR8 during hunting season in Wyoming and other states, where I'm likely to encounter anything interested in gettin' a chunk-o'-my-ass. Eight .357 Magnum handloads of 158 gr. Nosler Jacketed Handgun bullets moving at about 1580 ft/ps, is more than enough to convince both four and two legged menaces that they may have just made the worst decision of what's left of their lives.

Love them both. But more rounds down range-faster I think I will still use my Glock 20+40's. Videos are awesome 😎

I really enjoy the vs video. Especially when it's done by someone like yourself that's well versed in guns, hunting , ect. The tactical videos are ok but not do to much good in the bush. There 2 different animals . I kinda get excited when I see you have new video up.

The .44 Mag: Leaving the efficacy of the .357 vs. 10mm for others to ponder. BTW, I love that bronze finish on the revolver.

41 Mag, because I don't have a 10mm. I do have a 357 Mag and have carried it for turkey season back east as well as during bow season in case of a black bear encounter.

Great video as always - I appreciate the content!!! This would also be interesting to see in a shorter barrel gun like the Glock 29 vs a Snub nose .357… I know often I’m trying to carry the smallest backup gun when out hunting and usually that’s my Ruger SP101 but also considering getting the new Springfield 10mm once it’s available (and I know many who think the same way).

I like that you carry both. I as well have a set up and can carry 2 side arms when needed.

I'm not ready to give up on my 357's just yet. Good video !

10mm, because I have a Springfield XDM 5.25. If I was on a vehicle I would probably take with my Ithaca with slugs or my Kel-Tek RFB with lake city .308.

G20 with 10mm would be my choice as well. That`s a hard combo to beat.

Love that .357 My Ruger GP100 Will keep me from being bear food😆 Hope u n the fam are well

Underwood ammo - good stuff. Performance is as advertised (usually better) and the components are top notch.

Seeing the nose distortion afterward, I have to wonder if the flutes survive contact with major bones in an animal, either. If not, then what's the point of the flutes? I guess they still do help to focus the impact force on first contact, helping to break through the barrier. But it seems like they would lose all of the special flesh-swirling effect that is supposed to be a signature of Lehigh Xtreme bullets, too. Still, 8 jugs after those barriers? Mighty fine.

Those may produce a larger cavity than hardcast,in gel the path looks like more than a rathole wound like buckshot or fmj.

G20 with the underwood is my Backcountry go to combo. Nice video!

I have a Glock 20 with a 6in KKM barrel, barrel sticks out about 2in so should help from going out of battery in close encounters! I can shoot a magazine in about 10 seconds accurately, so imho its the better option! my wheel gun is a 7.5in Ruger Super Redhawk in .480 Love all of your content, very well done!

Great test 👍🏻 I will say performance was about equal here.

I live in New Zealand, we have no bear or predators that we would need protection from a gun. Watching your videos makes me wish we did. Love your channel.

Thanks for the vid Chuck!

Those two are good for Saturday night in north side Ft Worth. I wouldn’t get out of the pickup in “bear country” if that’s all I had to save life. If I didn’t already have a .460 S&W I would save my money and go buy one before I spent any time thinking about that kind of trip.

I love my .357. It will put down anything I run into in the Pennsylvania woods, plus there is always the option of.38 snake shot rounds. Cool video

I have a .357 with hardcast rounds. Problem is next shot and next shot. Bears don't just go down in a fight. I don't have one yet but 10mm with penetrators makes most sense in a life or death situation. Recent class I took, an instructor relayed a story that a man survived an attack with an auto on his back driving every round he could into the bears neck under the chin. I believe one part of his survival is that autos are compact and good on close combat situations.

I’ve got a 6” Glock barrel in my G20. I had a KKM Precision barrel in it but it’s such a precise tight barrel that once in a while a round would catch going into the barrel. I don’t even consider my .357. I either grab the G20 or the Ruger Alaskan .44.

Always a great watch brother. I would like to see this same test with a stone stock average 10mm vs that standard revo. More people by far carry a std 10 than one with a longer barrel

I think either will work. I have the 10mm now and should have bought one a lot earlier.

I went in to this video wanting the .357 mag to win as I’m a huge fan of that cartridge. But I’d take the 10mm based on those tests.

Bears…great Dan, now the whole station is in jeopardy! That aside… I have the G20 and run the 200 grain Underwood. Good stuff.

Outstanding. I have both and have wondered this. Honestly, I would pick up my 454 Casull. Because I do not own a S&W 500. But if out of the two you tested. 10mm All the way. Even if it fell behind the 357. Reason being. That Glock carries more than 6 rounds. LOL. Good job.

Thanks for the video. Since I own a 357magnum and do not own a 10mm, I use the 357magnum for bear defense. On the other hand, since I own a 45acp, I am now willing to try the 200grain Underwood Extreme Penetrator for bear defense.

Well toss up go to in are family always been 357mag. But moder semi autos 10mm is not a bad choice. But revolver is always going to be the better option with bad weather or if bear get u pull down ground revolver still go off push in to it where auto may not cycle. Plus got remember not ever state allows semi auto as hunting firearm. Here in Pennsylvania auto are allowed be carry but only for self defense for 2 leg attakers better have good reason on 4 leg attacker.

Interesting test, both are good cartridges, I wonder how do they stack up while being fired from a rifle instead of a pistol.

Love my G20 so much I got a G29 for edc. I’ve got a couple loads in 155gr and 180gr that are below max charge that are well over 600ft lbs.

It's hard to wrap my mind around either of these calibers being good for bear protection. From what I have learned so far is, penetration is king.

Thank you. I enjoyed it. On the side note...the standard deviation (SD) is absolutely irrelevant unless you are shooting past 500 yrds. For handgun ammo to be used as a potential bear defense, SD plays zero role. As far as caliber, 10mm or 357 would be the bare minimum for a bear.

Love your precision testing, star wars graphics, funny music. Title should have been " 10 mm is better than .357" because it's metric" good job guys 👍💥☮️🇺🇲. 72 in New Hampshire.

I have changed over from hard cast .44 mags to ext penetrators for my bear protection needs this year

I haven’t found any under wood ammo in 10mm anywhere. I’d like to get some 200gn hardcast I’m patiently waiting. Cool test thou.

I tried them in both caliber same, they don’t penetrate any better than standard round ball FMJ or flat nose in same caliber’s.

If I can find that 10mm I am going to pick them up. I do love both of those calibers.

I guess it would boil down to which type firearm I was more comfortable with. Never shot a 10mm but my Dan Wesson 6" is certainly pretty snappy. On a side note, the .357 in 20" lever action is intriguing from what I've seen. I haven't measured .357 in mine yet but did measure .38 special 158gr. Federal; box says 770fps and I got over 980fps and it was louder than I expected, lol.

Another issue manufacturers have now is supply of copper is in shortages. The factory 3rd shift has shut down on all manufacturers. Before it was primers.

Both , they Both work great ! 10 mm is good in better loading but falls short in most . 357 is more consistent in most loadings and offers more options in reloads , can be loaded better . In a Semi auto round the 357 sig has had some impressive outcomes for me too . Most ammo brands are more consistent in that load too. The grip size , speed on target, reliability and accuracy in that round is very good 👍 all awesome guns and rounds .

Good stuff brother!

I think it would depend on whether you want to carry a revolver or a semi auto. Especially with those rounds I think that either would work well.

With the choice of 357 mag or 10mm the choice for me 10mm hands down 👍🏻 It would be nice to have an autoloader in 41mag...that would be a awesome choice 😀 👌 🇨🇱 ☆ Good video Chuck 👍

I have a box I haven’t shot yet for my Glock 40. Thanks for posting

That 10mm is an incredible round! I am amazed that its not become a near standard in a lot of situations? I'll admit that i actually thought the .357 Magnum was the better round across the board but its clearly same ways behind performance wise. Great test!

Great video 👍 I have both rounds in multiple guns. I say ether round has great benefits in the woods down here in the lower 48.

I think I like hardcast more. It slower but hits hard! The penetrator faster and punches hole quick. Also they deflect more when hit bone ect. As the hardcast stays closer to its original path

Nice! I like the 10mm but I’d say .357 or 10mm would do the trick, depends what you shoot best. I could see packing the Glock as main side arm and maybe a snub/2-3” .357 for a backup gun. I only get close to black bears in Smokey mtns so I just go with 10mm, .357 sig, or a .40 S&w. And then pack a smaller 9mm for edc and switch from deep penetrators to HP’s when in town.

Thanks for doing a 10mm video Nutnfancy is the only other guy who does a good job of representing the 10. I just bought a Glock 20 for bear 🐻 and self defense! Thanks again good video.

I use my s&w model 629 8 " barrel 44 mag when I'm in bear country. 12 g 00 is a great choice also 👌

10mm continues to impress!

I dont have a 10mm but I like the heavy 180 grain hardcast for my .357. Im not really sure what to think of these xtreme penetrators/ other "gimmick" type rounds.

Thank you for this video. Rev

When I lived in the PA mountains in black bear country I carried a 380 loaded with Buffalo Bore 100 grain plus P hardcast flat nose rounds. Never needed the gun, but I have chased big 600 lb black bears down the street with a flashlight.

10 MM is that really a question !! I don't own a 357 I have 3- 10mm pistols & a 10mm AR . I would like a Stainless 357 Marlin & your Ruger is Cool !!! My first handgun was a Ruger 357 Blackhawk 4 5/8" Great Gun !

I'll carry my 357 in bear country if I have to and with hardcast ammo, btw that 10 mm is a pretty sweet gun. I think both are decent choices and you get faster follow up shots. The 10 mm has more capacity though so definitely something to consider. I did a test with some medium fast burning powder and I found a sweet spot with unique and the Lee 158 gr RF. I am pushing it 1200 fps out of a 4 inch ruger and it penetrated a dinner plate and 4 milk jugs. Also went through 8.5 inches of 2x4s. Recoil was pretty mild it just felt like a hot 38 special tbh.

It boils down to more reliable or more shots. Both serve you well

I have both and have been range shooting both in 4", 5" and 6" barrel lengths. If my life is on the line, I'm not sure I can fully trust a 1911 or striker/fire in the heat on the moment. Feeding issues and jam ups/stove pipe happen with ALL of them, sometimes ammo out of spec related, though Underwood has never failed me. My 357 Python revolver will always fire, and I personally seem to hit the target at distance a little better with it. In some cases you may only get off 3 to 4 rounds a big game charging is on you. Draw speed and accuracy is vital. Through heavy brush its 10mm Dan Wesson with 9 rd mag, but as a backup in more open territory - such as an injured bear you shot charging - I'm going 357 mag in revolver.

Shot to shot, it looks like either pushes an individual round deep enough.

Either would work but would prefer the 357 revolver👍👍

Brutha love the videos, the pressure...😮

.... very well presented young man .....

Holy shit! $11 price hike for the .357 over the 10mm

Been carrying a .357 for over 30 years and not switching but enjoyable test. In all honesty both will ruin someone's day. Lol.

recoil management was so nice on these out my witness 10mm polimor functioned fine idk why you would want to carry anything else in the woods

Great video, very educational 😎👍

I’d like to see you test that Federal Solid Core 10mm 200 grain! I did some testing on my own with it and so far I think it might be decent but I’m not 100% convinced. I don’t own a chronograph and I ran out of water jugs before I was able capture a round that penetrated water. They did penetrate 9.5” of 2x4s stacked and I was able to retain that bullet. With my last 6 water jugs they penetrated all 6, split them all down the middle and exited (I did not have anything in front of them). Any interest in that round?

Definitely would go with the 10mm too.

I grew up in Alaska and a 44mag & a 12g slugs would be the order of business. However I kinda like a 10mm, always wanted one. I understand the Finland ski patrol carry glock 20's for polar bear defense. I would certainly choose a 10mm before a 357mag for bear. Though I do have a box of 180g hard cast for my 357 mag.

I use a XDM 5.25 with underwood 220g hard cast. Didn’t go with the G40 because I didn’t want to need get a second barrel for hard cast.

I have both but carry the Glock 29 10mm for EDC!!!!

Awesome Bullets !!!!!!!!!!!!! I would still take the 357 magnum in my S&W 686-Plus TALO edition.

Extreme penetrators have extremely sharp edges and the fluting will do much more terminal damage than hard cast. You got to buy some and find out for yourself. They are awesome. Just wish I could find some for my 357 SIG!

Have you tried the Buffalo Bore .357 mag. load featuring a 180gr. hard cast projectile with gas check, called the "Heavy 357 mag Outdoorsman"? It's rated @ 1400 fps out of a 4" bbl. That's over 780 ft/lbs of energy and it has such a high sectional density that I have not been able to observe anything from "Extreme Penetrator" that even comes close. Of course, the recoil is something else, but I get what I paid for here in Wyoming where we also, like you, occasionally run into some fairly large critters with teeth, claws and a bad attitude.

The real question is has a 357 Magnum which full power loads ever been to Africa and taken down a cape buffalo in two shots. If not then it's no match against the 10mm whatsoever, because Razor Dobbs has with his Dan Wesson 5 inch barrel 10mm. He killed 2 cape buffalo with his 10mm

I'd have to go 10mm. Carry G20 for EDC

Thank you for the video

I’ll take the semi auto every time! Simply for capacity and speed. I carry a S&W 460 mag some times just because it’s way cool but usually I carry a HK VP9 9mm with the extreme penetrators.

That’s not particleboard that’s oriented strand board OSB.

10mm is the way to go and more has more rounds.

Great video ! My g20 with 6"KKM any day in the wild, and in da hoood.

In the old days similar bullets were made of bronze but the forces of evil have put a stop to that. What a shame, performance would be even better. I have a very similar Glock 21 and am putting together a Glock 41 in 460 Rowland. Just waiting for the barrel kit. You are making excellent videos for this purpose.

10 mm is a beast

100% Glock 10mm you get 15 rounds compared to 5-6 I'm the 357 with equal or greater ballistic performance

Rough choice. All others being equal revolvers are not as tempermental if they get dumped in the dirt or dropped or banged. They may be lighter , depending on what they are being compared with, but then the 16 rounds of ammo in the pistol adds a lot of weight as does the square shape of a pistol. But assuming I take really good care to make sure my gun is clean, and Im man enough to heft it, I like the idea of having more shots against a charging bear. Not that you would have enough time to shoot that many, but I would hate to RUN OUT and have that be my last thought. There is some logic behind a LARGER revolver like a .44 which might not need as many shots, provided you could control it, and again, weight. But in my opinion, all of these are GOOD options. Any of these weapons would ease the mind. At least we aren't arguing about 9mm and .45 anymore when it comes to bears. Don't mean to offend if THOSE are your choices, but based on what I know, they are bad choices indeed unless the idea is to shoot yourself so you don't suffer as much. Databyter

Are there any 9mm or 40 cal rounds that you would trust for bear protection? Ive got a glock 19 and a 27. I was looking for something i could use in one of those, or do you think i really need something bigger?