Hey. Like the plain talk video. I have a 24" ARC and just did some SD testing. With a Barnes 105 Match Burner, hit 2813fps with 28.9gr LVR. Brass was still looking good with only slight ejector marks. I was down into the single digit SD at 28.6 and 28.9 with good groups. Now comes the accuracy dial-in and will use 28.6gr(2777fps) as the load and change seating depth by .003" at a time. Keep up the good work. One day this summer going to make it out to high altitude/low humidity out in Colorado and see how it goes. Oh, as others state about the effect on the harmonics of the Sporter, I canceled that out with a mount from Wiser Precision. Thanks for the videos.
@@blakemonroe5431 Scopes are a whole discussion to themselves. 1. For an AR-15, buy a more tactical/compact type scope in the 4-16 adjustment range. 2. Choose a reticle that is comfortable for your eye and not to intrusive. 3. Stay within your budget/affordability range.
That’s crazy I’m Running 29.3 in my 6 arc with the same powder and get 2806 FPS out of a 20in barrel. Only difference is if 2.260 overall length and my rifle runs fine
Hey Dave ,does not the magnetospeed effect the barrel harmonics? I use one for my velocity but remove it for shooting my groups. I think you are very knowledgeable and do enjoy your experience
Thanks for the kind words. I have not experienced much change in bullet point of impact with the magnetospeed sporter. But you are wise to first gather data for precision, then fine tune for accuracy without barrel hindrance.
Nice video. The wind noise was a little bit loud but I could understand what you were saying. I also didn’t catch how far you were shooting? I may have missed it and I assume it was a hundred yards but not sure. I know it is probably windy there on a regular basis but a gust while shooting is going to affect the group. Thank you for the video!
Yes, 100 yards, wind affects everything. Groups are only important for load development or competitive shooting sports. When hunting, one is likely to encounter all types of environmental conditions, ( wind, rain, snow, etc). While these conditions do not lend well for video making, they are real world practice and do build confidence in ones ability to take the shot or not to take the shot while hunting.
@@davestrohmeyer-saddleupsho8009 oh I absolutely agree with you about hunting in all conditions. And I know from many videos the 6mm arc does very well in windy conditions. But in my opinion if you are predicting how a round will group in various wind conditions, three rounds is not enough to get a good measure. One round could abandon the group from wind and more shots down range would help determine a wind blow shot. Just my two cents. I also agree with the guy who brought the potential harmonics concern. Would you have different results using a chronograph versus your magneto speed? Great stuff!
@@justflylow Over a beverage or two or three, we could have a great discussion about all the minutia concerning internal, external and terminal ballistics and the factors that affect precision and accuracy. In fact volumes of books have been written by people who forgot more about precision and accuracy than I will ever know. I still fall into the category of shooter/hunter, whereby practice makes perfect and hopefully only one shot (the first shot) is the most important.
Have you tried CFE223? I just got my reloading machine back in action, and worked up my first set of loads for the 108s. I’ve only been able to Chrono and check for pressure signs so far. I’ll get out to check accuracy later, but seems promising with an SD of 11. 20 inch barrel getting 2635, spot on with the Hornady manual. I started at 27 grains, then jumped to 28.8, and stopped there. My scale must not be that accurate, because I’m getting results you should get for the max load of 29.1. Cases looked good. I think I’m gonna leave my powder measure set up where it’s at, so I can put 105s or 103s without making an adjustment or worrying about pressure.
@@davestrohmeyer-saddleupsho8009 Thanks for the reply. I’m running at max COAL for the 108s, I’ll just have to seat a little deeper/shorter COAL for the lighter bullets. I’ll give em a try. Have you tried 110s?
@@jcnikoley No I have not. For me the ARC is a in-between cartridge. Grendel-ARC are to close in most bullet weights for varmints up to deer. Then for speed increase, long range and terminal performance on medium game it is the 25-06 and 6.5 Creedmoor.
My old old load for my .243 in a 788 Remington is not much faster then that at 42.5 gr imr4350 with 95gr nosler partition, best hunting round for my rifle, probably been using this load for 40 years lol
Yes it is. But the case burrs and the high velocity reading from the magnetto speed don't lie. The contributing factor was the case overall being too long for my chamber therefore the bullet was jammed in the lands. I have since reduced the load and set the 103's deeper by 20 thousands. My follow up video shows the improvement.
Seems like that bayonet clamped on the barrel would affect the harmonics/accuracy ? May help or hurt but definitely changes the harmonics. Why not attach on the forearm instead of barrel?
I have seen a forearm adapter and may look into it. My experience has been a marginal effect when gathering reloading data. Velocity, SD's and extreme spreads data validates the consistency of my handloads. With that data, I'll then move on to fine tuning for accuracy without the magnettospeed attached. Thanks for your comment.
Maybe I missed it but what length barrel? I love this cartridge. Got a Barrett REC7 DI that I put a CMMG 20” nitride barrel and build a billet Wilson Combat with MosTek 21” nitride barrel. Went all out on that gun. SLR titanium gas block, 2A titanium brake, titanium BCG.
what magazine are you using? Ive got an ASC one made for the 6mm arc in 25rd capacity, might get a 10 or 5rd. Also Im still new to reloading and was wondering why you say its too high of a velocity?
Thanks for your questions. I use 10 round e-Landers for both the Grendel and the ARC. Velocity and case or chamber pressure go hand and glove and is a primary indicator during load development. The ARC is new (2020) so the main source of reloading data is Hornady. When Hornady publishes velocity data with their max powder charges and my rifle exceeds those numbers further evaluation of the components and rifle need to be inspected. A catastrophic failure cannot be undone but can be prevented. So we need to follow the guidelines and work up cautiously.
