Shot the following powders: BL-C(2), Benchmark, H322, H335, H4198, H4895, and Varget. In a nutshell, the two contenders by a long shot are H322 and H4198. They both are very accurate and fast. I'm done with the load work for the H322, 36.5-grains is chunking the 250-grain bullet toward the target at 2035 FPS. The average pressure is 38.5K PSI with a SD of 883 PSI so the up side of the deviation is tickling 40.0K PSI. That is it for this powder. I only shoot at 50 yards with the pressure trace equipment and spend more time concentrating on the shot and not tearing anything up but the accuracy good. 1.54". It will tighten up when I shoot for accuracy without all the gear hooked up.
H4198 produced a 1.128" 5 shot group with 31.8-grains at 34.6K PSI and 1965 FPS. I'm going to throw a little more wood on the fire and bring it up to the same pressure level as the H322 to see if it will match the velocity. I'm actually expecting the accuracy of this load to tighten up with a bit more pressure on it as the was the trend in the load work and the pressure trace indicates it will move toward optimum barrel timing with the increased charge. Once this is done tomorrow. I will start working on 100 and then 200 yard accuracy. This is going to make a very good deer rifle!
This is a big pill to pop out of this carbine!
