denton
10-30-2006, 10:33 PM
Made it back to the range for an hour today, and collected a bit more "adult load" data for my 7x57.
This rifle has a long throat. 162 grain Hornadys are about .050" off the lands. That may produce lower pressure and speed than other rifles. Also note that your rifle will be different, and your jar of powder will be different, so this data is for reference and comparison only:
Powder: H414
Bullet: 150 grain Sierra BTSP
COL: 3.090"
Primer: CCI 200
Today's temperature at the range: 52F
I kept the ammo in an inside jacket pocket, and warmed up the barrel with some other loads. I did the shots fairly rapidly, to keep the barrel warm.
Grains.....PSI..........FPS
45..........35,645.....2508
46..........38,993.....2564
47..........42,339.....2620
48..........45,686.....2675
49..........49,032.....2731
Results projected for another grain:
50.........52,379.....2787
56 FPS and 3346 PSI per additional grain.
So this is an OK load. H4350 can do a little better, within safe pressure limits.
This rifle has a long throat. 162 grain Hornadys are about .050" off the lands. That may produce lower pressure and speed than other rifles. Also note that your rifle will be different, and your jar of powder will be different, so this data is for reference and comparison only:
Powder: H414
Bullet: 150 grain Sierra BTSP
COL: 3.090"
Primer: CCI 200
Today's temperature at the range: 52F
I kept the ammo in an inside jacket pocket, and warmed up the barrel with some other loads. I did the shots fairly rapidly, to keep the barrel warm.
Grains.....PSI..........FPS
45..........35,645.....2508
46..........38,993.....2564
47..........42,339.....2620
48..........45,686.....2675
49..........49,032.....2731
Results projected for another grain:
50.........52,379.....2787
56 FPS and 3346 PSI per additional grain.
So this is an OK load. H4350 can do a little better, within safe pressure limits.