Chronographed velocities.
04-09-2008, 10:38 AM
#1
Boone & Crockett
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Join Date: Jan 2004
Location: Eastern PA
Posts: 12,747
Chronographed velocities.
Has anyone chronographed MV for 54 cal PRB using 80 gr Pyrodex? Or 50 cal 275 gr Maxihunters with 80 gr Pyrodex?
If you did, can you please tell me what the fps is?
If you did, can you please tell me what the fps is?
04-09-2008, 11:55 AM
#3
Boone & Crockett
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Join Date: Jan 2004
Location: Eastern PA
Posts: 12,747
RE: Chronographed velocities.
Dave - your the man! I figured you would be the one to come through. Just one thing though, I think you calculation for the 50 cal 275 gr Maxi is a bit off for the ME. I calculated it out to be 1363 FtLbs. Your figures for the 54 cal PRB are right on the money.
((1494*1494)275)/450000= 1364
PS: thanks - you saved me from buying a chrony. At least for now.
((1494*1494)275)/450000= 1364
PS: thanks - you saved me from buying a chrony. At least for now.
04-09-2008, 06:29 PM
#5
Boone & Crockett
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Join Date: Jan 2004
Location: Eastern PA
Posts: 12,747
RE: Chronographed velocities.
OK - I see where they came up with the 1586 ME. They used the 320 gr bullet. Surprisingly that 45 extra grains of bullet at the same velocity can account for a tad over 120 FtLbs of energy.
I know the formula for computing energy from my archery days. I just didn't know the velocity.
FYI and anyone else following this th formula for computing ME is Einstein's formula E=M(C*C)/450,000 where M=bullet wt in gr. and C=velocity. The 450,000 is a constant.
I know the formula for computing energy from my archery days. I just didn't know the velocity.
FYI and anyone else following this th formula for computing ME is Einstein's formula E=M(C*C)/450,000 where M=bullet wt in gr. and C=velocity. The 450,000 is a constant.
