Dennis1131 Posted February 17, 2012 Share Posted February 17, 2012 How do you calculate power factor that I keep reading about in the forums Link to comment Share on other sites More sharing options...
stein Posted February 17, 2012 Share Posted February 17, 2012 bullet weight(in grains) X velocity(in feet per second) / 1000 = power factor Link to comment Share on other sites More sharing options...
Csiedmond1 Posted February 17, 2012 Share Posted February 17, 2012 Thanks for asking the question, I've been to scared to ask!!! Link to comment Share on other sites More sharing options...
StravIs09 Posted February 17, 2012 Share Posted February 17, 2012 165 for major:P Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted February 17, 2012 Share Posted February 17, 2012 bullet weight(in grains) X velocity(in feet per second) / 1000 = power factor For example, a 125 grain bullet @ 1000 fps, is 125 x 1,000 - 125,000 divided by 1,000 (you just take off the last three zero's), and your PF is 125. Link to comment Share on other sites More sharing options...
Tactica Posted February 17, 2012 Share Posted February 17, 2012 To piggy-back on what was said above, It helps to have a good beam scale for weight, don't just trust the label on the box, digital scales can be tempermental and are subject to all kinds of variables that you may not wish to fiddle with. Calibrated beam scales are what I've found to be the most trustworthy. Measure several bullets to get an average weight. Velocity is measured by using a calibrted Chronograph in proper lighting. Again, fire several rounds through it to get an average velocity. When testing loads, it helps to have 10 or so rounds of each receipe in a zip lock bag or equivilent. Label each bag and start with your lighter loads. Us a log and write down your measurements per load. That way, you can Chrono all of your potential loads at once. Good luck, Link to comment Share on other sites More sharing options...
superdude Posted February 18, 2012 Share Posted February 18, 2012 http://38super.net/Pages/Major.html Link to comment Share on other sites More sharing options...
gunguru Posted February 20, 2012 Share Posted February 20, 2012 Or to show the thing with real Data (general commercial ammo figure) 9X19, 124gr @ 1090 fps : 124*1090/1000=135 40 SW, 165gr @ 1100 fps : 182 45 ACP. 230gr @ 835 fps: 192 Link to comment Share on other sites More sharing options...
spideysteve Posted February 28, 2012 Share Posted February 28, 2012 165 for major:P 170 in IPSC Standard division 160 in IPSC Open division Link to comment Share on other sites More sharing options...
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