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How close are your loads to minmum power factor?


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I am working on my wild bunch loads and was just wondering how close you run to minimum power factor?  Also, if I am ever checked, how many loads will they test?  The way I have been doing it is to shoot ten shots of a load through my chronograph, average the ten loads and then calculate power factor.  Is that the correct way of doing it or do I keep upping the powder until all ten are above power factor? 
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They will commonly take 6 rounds, pull one apart to weigh the bullet, then fire 5 and average power factor.  150.0 passes.  149.9 does not.  And a 180 grain bullet passes.  A 179.9 grain does not.

 

Of course, testing at any given match depends upon the crew performing the work.

 

I load to 168 PF in 1911 loads.  About 185-190 PF in .45 Colt rifle loads.

 

good luck, GJ

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The reason I am testing is I came across a deal too good to pass up and now have 10k 200 grain round nose bullets.  I am very happy with my 230 grain load but wanted to try these 200's.  I will go with the load that puts my power factor in the 160's.  Thanks GJ! 
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HI Gang; When I test PF all loads MUST pass the 150. WHAT IF you happen to get three low shots of ten thousand and there the ones tested? Muffery was a optimist!

All my loads test over 155 PF at the low end using 200 grain lead. Tested at a few match's load is mostly 158 or more, That is close. IF I were to invest a few thousand dollars to go to EOT, the first thing I would do is increase the powder to 160 plus PF. I have test and proven load for any big match just to be sure that I feel may need the extra. Temperature, altitude, weather, screwed up machine, it all needs to be considered.

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162 to 165 PF seems to be my magic number.

In the past, for me, they have pulled 10 rounds of each. They will test 5 of each and if you pass you can get the others back. If not, they will come get you and fire the remainder through your firearm. A couple of times I have had a bullet pulled and weighed. Every match is different. You can see the recommendations in the Match Directors Manual on this site.

The most interesting method I encountered was in Texas. You took 100 rounds to the tester. 1 round was randomly selected from the 100, if it was sufficiently high you passed. If not, Dusty Boddoms would pick 4 more and do a complete test.

JFN

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