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Old 09-09-2013, 13:54   #26
fredj338
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Originally Posted by steve4102 View Post
Velocity "Modified for barrel length", How much for each inch of barrel? Is this the same for rifle as it is for pistol. Where did you get your "Modified for barrel length" number? Is there a hard and fast rule for this or is it an educated Guess?
There are few hard & fast rules in reloading. For rifles, 40-50fps is the avg vel loss per 1" of bbl. Yeah, it's based on various tests through out the year, but it is a guide line. For handguns 30-40fps +/-, again, based on past tests. My point, you can't look at book data for say the 223 w/ 24" bbl & try to get sim results w/ a 16" bbl AR or 44mag loads in a 4" from 7 1/2" data. None of this is new, w/ QL just being a better WAG. The only true numbers come from a chrono & pressure test in your gun. Even pressure tested data in the books is good for ONLY that gun & those exact components.
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Old 09-09-2013, 16:06   #27
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Right, so following published data is pretty much a WAG as is Quickload.
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Old 09-09-2013, 16:13   #28
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delete double post
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Old 09-09-2013, 16:54   #29
fredj338
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Originally Posted by steve4102 View Post
Right, so following published data is pretty much a WAG as is Quickload.
Both are educated WAG. QL, no gun, no actual testing, just average numbers. In a manual loads are tested in a single gun. So your results will vary, sometimes quite a lot. The only way to accurately work up loads is in your gun, chrono & pressure testing. Since none of us do that, we have some extrapolating to do, but you can never, with finality, say what the pressure is in your load/gun combo.
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