Thread: Crimping ?
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Old 09-30-2012, 13:06   #77
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Originally Posted by Gpruitt54 View Post
I think you are saying that I should always for the max OAL? Is that basically it?
YEs, the OAL in most manuals is a tested OAL or minimum. Going below that will increase pressures, loaded longer reduces pressures. So think of a longer OAL as insurance. My point about measuring a factory round is it's a dangerous assumption that it is correct or safe. Load a faster powder, like AA#2 to the top end & then load it at shorter OAL, you are pushing over pressure. Since most powders do NOT build pressure in a linear fashion, there is really no "a little over max". Some powders spike as you go over the top end, some spike badly enough to cause a KB (Clays, TG), so just plugging in a factory OAL can get you into trouble with wrong loads.
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Last edited by fredj338; 09-30-2012 at 13:08..
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