armednfree
New member
17 years ago I had a Winchester 22-250 Coyote, laminate stock, rebarreled in 284 Winchester. I had a 28 inch Douglas heavy barrel put on. I first tried to load 145 grain Speer match bullets but quickly went to 168 Matchking's when 145's were neither very accurate nor carried well beyond 800 yards. I tried several powders but ended up with H4831sc. I could not go beyond 56grains, max book is 58, in the Winchester brass. The Winchester brass would expand it's primer pockets at 56.5 grains and beyond. The Winchester brass was not really good requiring heavy sorting. Weights ran as much as 3 grains difference and neck walls were all over the place. I moved on to other rifles for long range and the 284 mostly sat in the safe.
I got other brass, Peterson, which is very consistent. I got it in my head to try and push that 168 to 3000fps using R17. At first I used the Winchester brass in case there was some sacrifice. I did hit 3024fps average but accuracy was dismal running in the 1.2" to 1.7" range. A switch to the Peterson brass brought that down to 1"-1.3", still not good. I abandoned the R17 pursuit.
Back to H4831sc. 56 grains in the Peterson brass far outclassed the same in the Winchester brass running groups of .7 to .9. Then I decided to bump it up to 56.5. The brass took it with no issue, pockets still tight. Groups shrank to .5-.6 and velocity averaged 2874fps. ES was only 57 fps with an SD of 17 on a 10 shot string (I forgot to reset the chronograph).
This next set, more 56.5 grains of H4831sc and then 57 grains IMR7828scc.
I'm not making 3000 fps with any accuracy but I'm only 125 or so FPS short of that. The 1-10 twist is marginal according to Berger's program. They want 1.5 and mine is 1.48. Close enough I'd say.
I got other brass, Peterson, which is very consistent. I got it in my head to try and push that 168 to 3000fps using R17. At first I used the Winchester brass in case there was some sacrifice. I did hit 3024fps average but accuracy was dismal running in the 1.2" to 1.7" range. A switch to the Peterson brass brought that down to 1"-1.3", still not good. I abandoned the R17 pursuit.
Back to H4831sc. 56 grains in the Peterson brass far outclassed the same in the Winchester brass running groups of .7 to .9. Then I decided to bump it up to 56.5. The brass took it with no issue, pockets still tight. Groups shrank to .5-.6 and velocity averaged 2874fps. ES was only 57 fps with an SD of 17 on a 10 shot string (I forgot to reset the chronograph).
This next set, more 56.5 grains of H4831sc and then 57 grains IMR7828scc.
I'm not making 3000 fps with any accuracy but I'm only 125 or so FPS short of that. The 1-10 twist is marginal according to Berger's program. They want 1.5 and mine is 1.48. Close enough I'd say.