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Old March 12, 2012, 11:34 AM   #7
Senior Member
Join Date: January 29, 2012
Location: Devon England
Posts: 177
Looked at your profile

Don't Know how to put up a profile of my own so:.I am a retied Electrical/electronic engineer. More importantly I am a Brit and don't own guns although I'm very interested. I wanted the formula so I could do in my head what you can do in practice (with your chrono). Somewhere on this sight I found a link to a site which calculates Muzzle velocity but needed "a published load", case capacities, lengths etc, and gave no formulas. When I tried to use it with what Info I had it seemed very inaccurate. It gave a velocity which was supposed to be 65% of the shots. The string deviation was always about 50ft/sec or more above and below the 65% value. I always thought published figures were about average for a string, perhaps plus or minus 25-30ft/sec.
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