niroth81 Posted October 9, 2013 Share Posted October 9, 2013 I've only been shooting IPSC for about 6 months now. Finally have my own gun (CZ 75 SP01 Shadow) and have worked up a load for it. I'm getting fairly consistent 1030-1040 fps with a 125gr pill, with the odd running just below 1000fps. I'm curious to see how close other shooters run their handloads to power factor requirement. Either for major or minor, do you only sit a few points above power factor, ie 128PF, or do you make sure you reach 130PF+ to give that fudge factor? Jase Link to comment Share on other sites More sharing options...
ParaGunner Posted October 9, 2013 Share Posted October 9, 2013 I try to hit 5-10pf over the requirement. Link to comment Share on other sites More sharing options...
TH3180 Posted October 9, 2013 Share Posted October 9, 2013 171ish for major. 135ish in minor. I'd run a little slow but I'm shooting a 147gr bullet. From everything I've read they like to go right around 135. Link to comment Share on other sites More sharing options...
cbrconst Posted October 9, 2013 Share Posted October 9, 2013 I cut it a little close at 166 at last match. Like to run about 170. Link to comment Share on other sites More sharing options...
Sean Gaines Posted October 9, 2013 Share Posted October 9, 2013 I think you will find a consensus of +5pf over the minimum power factor for that division, whether it be minor or major. Link to comment Share on other sites More sharing options...
DWFAN Posted October 9, 2013 Share Posted October 9, 2013 I run 132 or higher PF depending on the powder I'm using. (more buffer if the powder is temp sensitive) Link to comment Share on other sites More sharing options...
Prov1x Posted October 9, 2013 Share Posted October 9, 2013 (edited) I tend to set mine up at 130 for minor and 170 for major. Although I cut it real close this past match at 125.2! The temp and conditions changed drastically from when I chronoed at home and at the match. Although my powder is not supposed to be temp sensitive it dropped. I chronoed in 83* sunny temps at home and the match was a cool 65* breezy and raining. A safe bet would be at least a +5 over minimum pf. Edited October 9, 2013 by Prov1x Link to comment Share on other sites More sharing options...
blueorb Posted October 9, 2013 Share Posted October 9, 2013 I run a CZ75 and shoot 147gr Bayou Bullets over 4.1gr of WSF. At the GA sectional last month I was 135.5, At the NC Sectional this past weekend I was 139. Quite a bit over min PF but I like how it shoots. I get good groups at 25 yrds. Link to comment Share on other sites More sharing options...
Sarge Posted October 9, 2013 Share Posted October 9, 2013 7-10 over Link to comment Share on other sites More sharing options...
Cy Soto Posted October 9, 2013 Share Posted October 9, 2013 Power Factor is irrelevant if your accuracy is mediocre. Most 9mm Production guns will peak in accuracy at 135 to 140 PF. Link to comment Share on other sites More sharing options...
vluc Posted October 9, 2013 Share Posted October 9, 2013 My g34 likes hotter, so for production (USPSA) I run at 137-139 PF. After a certain point, you can't tell a difference. Like mentioned above, I'd recommend 135. Link to comment Share on other sites More sharing options...
Sean Gaines Posted October 9, 2013 Share Posted October 9, 2013 7-10 over Perfect! In limited I am at 172pf, in production I run 135pf (just feels better) Link to comment Share on other sites More sharing options...
seanc Posted October 9, 2013 Share Posted October 9, 2013 8-10 over, if the trip is particularly costly, I go more like 12 over. I got burned at area 7, thought it turned out to not matter because gun broke, but the last thing I want is excitement about making it at chrono. Link to comment Share on other sites More sharing options...
TwoShot Posted October 9, 2013 Share Posted October 9, 2013 170 for local matches, 175 for bigger matches in major 9. Link to comment Share on other sites More sharing options...
GuildSF4 Posted October 9, 2013 Share Posted October 9, 2013 7-10 over Kind of this, although it does depend on the gun. My old open gun ran the best at about a 200pf (9x25), The one I use now works best at about 175pf. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted October 9, 2013 Share Posted October 9, 2013 I'm getting 1030-1040 fps with a 125gr pill, with the odd running just below 1000fps. Jase, I fire at least 20 shots and take The Lowest Velocity - use that as my PF. In your case, the "odd running below 1,000" is too low for me. I'd make sure that none of 20 - 30 rounds run "below the 1,000 mark". Link to comment Share on other sites More sharing options...
JonSnow Posted October 9, 2013 Share Posted October 9, 2013 (edited) Just to make things complicated for myself, when I chrono a new load I aim for bullet weight times velocity minus one standard deviation to be at or above 165 PF. That way I know that even if I get unlucky with the rounds pulled for chrono I SHOULD still be fine. (And of course the load has to be accurate and reliable). Edited October 9, 2013 by JonSnow Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted October 9, 2013 Share Posted October 9, 2013 I aim for bullet weight times velocity minus one standard deviation to be at or above 165 PF. What is "one std dev"? Link to comment Share on other sites More sharing options...
PKT1106 Posted October 9, 2013 Share Posted October 9, 2013 I am for 169-170 for major and 130-131 for minor. Link to comment Share on other sites More sharing options...
PKT1106 Posted October 9, 2013 Share Posted October 9, 2013 I aim for bullet weight times velocity minus one standard deviation to be at or above 165 PF. What is "one std dev"? One standard deviation is a statistics term that helps to evaluate the different values of a test and see how they disperse around the average. One standard deviation means that roughly 84% of your test loads should be above your acceptable threshold. Link to comment Share on other sites More sharing options...
EkuJustice Posted October 9, 2013 Share Posted October 9, 2013 For limited major Im shooting for 173, for SS/production Minor I am shooting for 135. For open I am in the 179-180 range I am never worried walking up to the chrono like several I have seen are that cut it way too close Link to comment Share on other sites More sharing options...
Flexmoney Posted October 9, 2013 Share Posted October 9, 2013 If you aren't running +10pf, check the math. http://www.brianenos.com/forums/index.php?showtopic=182623#entry2015920 Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted October 9, 2013 Share Posted October 9, 2013 I aim for one standard deviation at or above 165 PF. What is "one std dev"? means that roughly 84% of your test loads should be above your acceptable threshold. Not sure how large a sample you're using (number of shots over chrono), but I like to shoot at least 20 shots (sample size) and have NONE of them below acceptable PF. Link to comment Share on other sites More sharing options...
PKT1106 Posted October 9, 2013 Share Posted October 9, 2013 Doesn't matter how large or small he sample is, standard deviation is calculated off of the numbers you get. Sample could be 5 or 500. The lower end of his standard deviation is 165PF. Out of 100 test loads, he expects 84 to make 165 or above. Link to comment Share on other sites More sharing options...
JonSnow Posted October 9, 2013 Share Posted October 9, 2013 I aim for one standard deviation at or above 165 PF. What is "one std dev"? means that roughly 84% of your test loads should be above your acceptable threshold. Not sure how large a sample you're using (number of shots over chrono), but I like to shoot at least 20 shots (sample size) and have NONE of them below acceptable PF. I shoot minimum 40 rounds over the chrono, throw out the highest and lowest, and calculate PF based on average velocity - one std dev. Many chronos will give you the std dev automatically, if not Excel can do it for you or I'm sure you can find an online calculator. Wiki article here: http://en.wikipedia.org/wiki/Standard_deviation Link to comment Share on other sites More sharing options...
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