Ok, I had an old McMillan stock laying around and decided to get an "Origin" action for it. I then picked up a pre fit Benchmark barrel. The problem was the only one I could find was a 1-8 twist. I actually wanted a 1-7.5 twist. I was assured that it would still shoot an 80gr bullet with no issues. My goal was to be able to shoot the 70 to 80gr bullets at 3000+fps out of a 22" barrel. This was going to be my coyote rifle, so I didn't want a heavy barrel and went with a Rem. Varmint style barrel.
When I started my load testing, I started off with CFE and it shot really well with all the bullets I tried. It also hit my velocity goals and even exceed them!! Since it was a temp sensitive powder, I decided to try IMR8208 it shot really well too and gave me nearly identical velocities. The only problem is 8208 is really hard to find!! I tired the 73ELDs, they shot really well too probably the 2nd best shooting one. Then the 80VLD and 80.5 Bergers and they also shot really well. But the best most consistent shooting bullet was the 77MKs. Almost all of the 5 shot groups were in the .4s to .2s!! And this was with both powders. I honestly have other powders to try but at this point, and the way it is shooting, I am pretty much done wasting components. Since this will be a 600yd varmint rifle I ran ballistic programs on all of the bullets that I shot and even others that I could not find to see what the difference would be at 600yds with the different BCs. It was actually only right at one MOA difference between all the different bullets. If I was going to shoot to 1000yds I might play with some different bullets.
Now for the loads, I found the best results (So far) with 28.5 grs of 8208 with the 80 and 80.5 Bergers and the 77SMKs. With the CFE it was 30.5grs and the same bullets with the 73ELD also really shooting well with it. My last trip out I bumped these up .3 and they shot about the same. I didn't have the chronograph so didn't get a speed. Speed with the CFE load and the 77s averages 3113fps. With the 8208 load it averages 3116fps!! 30.8 of CFE with the 73ELDs was 3182fps. With the 80 and 80.5 Bergers and 28.5grs of 8208 I was getting 3058fps, and 3016fps with 30.0 of CFE. I use the CCI 450s for all my loads. I hope this answers all of your questions and thank you for the nice comments. You should see how my heavy barrel 6ARC shoots!! It is a solid .2 or better gun with 90 Bergers doing 3040fps!!!
When I started my load testing, I started off with CFE and it shot really well with all the bullets I tried. It also hit my velocity goals and even exceed them!! Since it was a temp sensitive powder, I decided to try IMR8208 it shot really well too and gave me nearly identical velocities. The only problem is 8208 is really hard to find!! I tired the 73ELDs, they shot really well too probably the 2nd best shooting one. Then the 80VLD and 80.5 Bergers and they also shot really well. But the best most consistent shooting bullet was the 77MKs. Almost all of the 5 shot groups were in the .4s to .2s!! And this was with both powders. I honestly have other powders to try but at this point, and the way it is shooting, I am pretty much done wasting components. Since this will be a 600yd varmint rifle I ran ballistic programs on all of the bullets that I shot and even others that I could not find to see what the difference would be at 600yds with the different BCs. It was actually only right at one MOA difference between all the different bullets. If I was going to shoot to 1000yds I might play with some different bullets.
Now for the loads, I found the best results (So far) with 28.5 grs of 8208 with the 80 and 80.5 Bergers and the 77SMKs. With the CFE it was 30.5grs and the same bullets with the 73ELD also really shooting well with it. My last trip out I bumped these up .3 and they shot about the same. I didn't have the chronograph so didn't get a speed. Speed with the CFE load and the 77s averages 3113fps. With the 8208 load it averages 3116fps!! 30.8 of CFE with the 73ELDs was 3182fps. With the 80 and 80.5 Bergers and 28.5grs of 8208 I was getting 3058fps, and 3016fps with 30.0 of CFE. I use the CCI 450s for all my loads. I hope this answers all of your questions and thank you for the nice comments. You should see how my heavy barrel 6ARC shoots!! It is a solid .2 or better gun with 90 Bergers doing 3040fps!!!