Different OAL for 9mm pistols?


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Shrinkmd
January 24, 2010, 11:58 PM
I was determining the longest OAL I could load a 124 gr LRN (Dardascast, bevel base, single lube band) and I got different max OAL which would allow the loaded dummy round to drop neatly into the barrel.

I had a range from 1.111 in an old 5906TSW, 1.077 in a 952-2, and 1.046 in an M&P9c. According to Lyman 49th Ed, the minimum OAL should be 1.060, but in a different shaped bullet of the same weight.

Do I need to work up different loads for each gun? How much of a difference in pressure/expected velocity is there between 1.046 and 1.111? Has anyone else had difficulty loading for the M&P9c?

I would love to be able to load one OAL which all pistols would feed nicely, but I can already hear the chorus of replies saying that the best accuracy (especially for the target gun) would only come by loading to the max allowable OAL for each gun Am I assuming correctly?

Would I be safe starting at 5.0 gr of Power Pistol at the 1.046 OAL, or should I start lower?

Help!

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