Trey Veston
Member
Got an 8lb jug of IMR 4227 from my dad and loaded up some .45 Colt loads for my Henry Black rifle.
Used 22 grains and 250 grain Hornady XTP bullet.
Based on the Hogdon data, using just 20 grains of powder, fired from a 7.250" barrel, should get 1150 fps using the exact same bullet.
I fired mine out of a 16" barrel and got right around 1150 fps, using 2 extra grains of powder.
Max load is 24.6 grains and gets 1343 fps out of the same 7" barrel.
Why would my loads be so much slower? Shooting at 32 degrees? Crimp too severe? Henry barrel too tight?
Shot another load using 10.5 grains of Unique and got 1200 fps and great 1" groups. 4227 loads were 1 3/4" groups.
Used 22 grains and 250 grain Hornady XTP bullet.
Based on the Hogdon data, using just 20 grains of powder, fired from a 7.250" barrel, should get 1150 fps using the exact same bullet.
I fired mine out of a 16" barrel and got right around 1150 fps, using 2 extra grains of powder.
Max load is 24.6 grains and gets 1343 fps out of the same 7" barrel.
Why would my loads be so much slower? Shooting at 32 degrees? Crimp too severe? Henry barrel too tight?
Shot another load using 10.5 grains of Unique and got 1200 fps and great 1" groups. 4227 loads were 1 3/4" groups.