usmc1974 Posted January 27, 2006 Share Posted January 27, 2006 I am not a rocket scientist so I need to know or try and understand, IPSC power factors. A 115 going 1300 has 431 pounds energy but don't make major. A 147 going 1125 makes major but only has 413 pounds of energy. Am I missing something?Thanks usmc1974 PF=VxW/1000 ENERGY=VxVxW/450240 115x1300/1000=149.500 PF=149.50 115x1300x1300/450240=431.658 ftlb energy=431.658 147x1125/1000=165.375 PF=165.375 147x1125x1125/450240=413.217 ftlb energy=413.217 Link to comment Share on other sites More sharing options...
shred Posted January 27, 2006 Share Posted January 27, 2006 Nope. PF does not equal KE, it's a measure of momentum. The reason Open shooters shoot light bullets is to get the powder gas to work the comp. PD shooters like 147's for the low powder charges and lower KE. Search around.. there's a ton here on "is recoil related to KE or PF?", and various technical discussions thereof one way and the other. Link to comment Share on other sites More sharing options...
revchuck Posted January 27, 2006 Share Posted January 27, 2006 (edited) Power factor was never designed to class ammo as to energy. It measures momentum. It came about to group handguns with similar amounts of recoil, so that lighter recoiling guns (for instance, BHPs and S&W M39s) would be scored together (peripheral hits get fewer points), and heavier recoiling guns - in those times, Colt Government Models in .45 ACP - would get more points for less-than-center hits. In those days, with the carry ammo that was commonly available, it was a decent approximation of their relative effectiveness for self-defense. Edited January 27, 2006 by revchuck Link to comment Share on other sites More sharing options...
shred Posted January 27, 2006 Share Posted January 27, 2006 Mod: Merged the topics back together since there were responses starting in both places. Link to comment Share on other sites More sharing options...
Ameiza Posted January 27, 2006 Share Posted January 27, 2006 There was an exellent discussion on the IPSC Global Village Forums some time ago. I suggest you read it. You will have to register, though... http://ipsc.invisionzone.com/index.php?showtopic=2498&hl= Link to comment Share on other sites More sharing options...
Harmon Posted January 27, 2006 Share Posted January 27, 2006 and a major load with a 230 grain bullet has only 263 foot pound of KE. how does that open pistola shoot with 147s? Link to comment Share on other sites More sharing options...
usmc1974 Posted January 27, 2006 Author Share Posted January 27, 2006 harmongreer It is a para p18 frame caspian slide briley ranped comp barrel I load them 1.180 AOL it rocks 5.7 grain Alliant power pistol powder Link to comment Share on other sites More sharing options...
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