The Firing Line Forums trying to understand power factor.
 User Name Remember Me? Password
 Forum Rules Firearms Safety Firearms Photos Links Library Lost Password Email Changes
 Register FAQ Calendar Search Today's Posts Mark Forums Read

 April 26, 2011, 01:05 AM #1 Madball6 Senior Member   Join Date: March 30, 2011 Posts: 206 trying to understand power factor. Can someone give me the "Idiots guide to Power Factor."? I'm interested in trying to get involved with defensive practical shooting competitions, but i dont understand the whole power factor consideration. Hoping to get an explanation in laymans terms although im not afraid of the math that may or may not be involved. I'm just confused about 9mm vs 40S&W vs 45acp. Im looking at starting in a production division, but not necessarily staying there. Just looking to get my feet wet. But i have several handguns and was just wondering about power factor and if i should bring one over another due to scoring. I'm honestly not trying to win anything, im a decent shot with all my pistols, but i think getting into some of these competitions may make me a better shooter. Just want more info into what i may be getting into. -Keith
 April 26, 2011, 01:17 AM #2 gunrobot Senior Member   Join Date: August 29, 2009 Posts: 414 Power factor is really simple. Bullet weight x Velocity you'll measure bullet weight by grains, typical weight for 9mm is 115gr, 124gr and 147gr, 45 ACP 200gr and 230grs. Velocity is measured using a chronograph, shoot 5-10 rounds through a chrono and get the average feet per second (FPS). As an example, I'll use my 45 ACP load, 230gr, average fps is 750. 230x750 = 172,500 or 172pf.Depending on which game you're playing, IDPA refers to it as 172,000pf and USPSA 172 pf. There are two types of power factor that are used in competition shooting : MAJOR and MINOR. Minor is 125 to 164 pf, Major is anything greater than or equal to 165. so my 172pf load makes Major powerfactor. If you're shooting production, you only have to worry about making Minor pf, so anything above 125pf. hope that helps. here's a wiki entry on PowerFactor : http://en.wikipedia.org/wiki/Power_factor_(pistol) __________________ [ http://gunbot.org | http://www.youtube.com/user/gunrobot ]
 April 26, 2011, 08:55 AM #3 Don P Senior Member   Join Date: December 17, 2005 Location: Florida Posts: 5,106 Major and minor(caliber) are for scoring purposes in USPSA. If you choose to shoot IDPA caliber will have NO bearing with regards to scoring. In both disciplines IF you re-load your ammo must meet the minimum required feet per second or power factor. At the local level ammo is not checked. At a state or national match ammo is checked using a chrono to see how fast your ammo is moving. If your ammo passes you are good to go. If your ammo fails you are DQ'ed and your shooting is all done for the match. __________________ NRA Life Member, NRA Range Safety Officer, NRA Certified Pistol Instructor, IDPA Safety Officer, USPSA NROI Range Officer, ICORE Range Officer As you are, I once was, As I am, You will be.

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Hogan's Alley     Tactics and Training     Handguns: The Semi-automatic Forum     Handguns: The Revolver Forum     Handguns: General Handgun Forum The Hide     The Art of the Rifle: Bolt, Lever, and Pump Action     The Art of the Rifle: Semi-automatics     The Art of the Rifle: General     The Dave McCracken Memorial Shotgun Forum     NFA Guns and Gear     The Hunt The North Corral     Lock and Load: Live Fire Exercises     Competition Shooting     Curios and Relics     Black Powder and Cowboy Action Shooting The Skunkworks     Gear and Accessories     The Smithy     Handloading, Reloading, and Bullet Casting         Bullet Casting     The Harley Nolden Memorial Institute for Firearms Research The Conference Center     General Discussion Forum         TFL Photo Contest     Law and Civil Rights         Legal and Political     S.W.A.T. Magazine The Firing Line Gun Show     S.W.A.T. Exchange     Retail Deals and Feedback Forum Support     Site Questions and Tech Support (NO FIREARMS QUESTIONS)     Software and Function Testing

All times are GMT -5. The time now is 01:10 AM.

 -- vBulletin 3 ---- vBulletin 3 - variable fonts ---- Low profile (unsupported) Forum Home Page - Archive - Top