The Hogdon extreme line of powders seems quite temp stable, saw this test repeated with 4350 and superformance and the results were similar to yours. What I don't understand is why folks test the powder in the bullet but not the whole platform as it would be in the field. It's beyond me how after sitting in the bush at -20C and lower how your ammo can cool down but your barrel and action aren't frozen - completely changing your rifle's harmonics. I'd be willing to bet you will get more variance from any of those load combinations if you put the rifle in the freezer for half a day and then repeated your test... these are real world shooting conditions for some of us up north.
I did just that but instead waited for winter to come so everything was at the same temp. Just for hunting temps though I didn’t freeze my rifle in a freezer just outside temp
Good test! A way to make it easier on yourself would be to get a small cooler and a small plug in or battery powered "warmer lunch box/bag". Pre load mags, put them in the containers for a few hours, or overnight or whatever, then just take the 2 containers to the bench with you. Keep ice or dry ice in the cooler, and keep the warmer turned on. Then just grab the pre loaded mags from the containers at the bench and send it. Your method clearly works, but this has been the least pain in the butt method that I have heard of for doing this kind of temp testing. Keep up the good work.
I tried this in my 35 whelen this year. Varget and CFE223. The CFE223 being very unstable supposedly. Tests at 20 degrees up to 50 degrees no change in either powder. I just tested at 87 degrees, varget stayed the same CFE increased 25 fps on average. Much less than i expected for temps I use this rifle. I also noticed out to 300 yards it really didn’t matter for accuracy, beyond that I’m sure it gets worse as you Extend but I’ve slowly been using some of the ball powders even though many guys say they are not a good choice
Another point of interest is that the faster group of Superformance is lower, so folks adjust their zero, if they know their velocities for the temperature. Makes sense that the impact is lower, since the barrel doesn't have as much time to rise before the bullet leaves. What confuses me is that I've seen POI also go up on some loads.
Not sure that impact will always go up or down based on higher or lower velocity. It seems to me it could go either way. If u believe in the vertical or up and down vibration of the muzzle as the round is fired depending on speed it could go up or down.
It appeared to me that you shot the Vargat right after the super performance. And did not give the gun 15 minutes to cool down. Regardless of the temperature instability, super performance held a tighter group. Both groups seem to hit the same elevation at the same point regardless of the instability with super performance.
Good stuff my friend. Any info on six millimeter calibers is greatly appreciated. Me And my shooting partner are currently into the six millimeter craze.😮😮😮
I know Superformance is very temp sensitive, but I have a 6mm creedmoor load using 115 DTAC’s, that consistently group under 1/2 moa. Just have to be careful to stay under max charges and keep an eye on pressure signs.
It's not probably not temperature stable, but LEVERevolution looks ideal for this cartridge with 105 grain Berger. It fills the case, 99.46% burned, and just over 3000 fps with under 60,000 PSI. *Work up to 37.3.*
I have very little lever evolution left and in the past with other cartridges it really was never a great performer. I also haven't really pushed the GT for velocity. It has been very happy around 2900fps. They need a Staball lever evolution.
First time viewer, I appreciate the test. However with the current price difference of the two, I'd take Superformance all day. Varget is literally 2x the cost. Unless you're shooting competitively past 300yd, I don't think you'll notice a difference other than your wallet being lighter 🤣Besides you can always zero your gun with a "cold load", and keep your rounds in a cooler with some ice packs prior to shooting a stage in competition.
