When you send Tom your reloads to test, you detail for him what powder, primer, hull, size shot and wad you used, plus grains and payload. With factory loads Tom doesn't know all the detailed components used and factory loads can vary from time to time. With factory loads the fps may average the same but if components vary, the pressures can change. As long as pressures fall within the standards, manufacturers don't care.
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"Life is short and you're dead an awful long time." Destry L. Hoffard
"Oh Christ, just shoot the damn thing."
Destry L. Hoffard
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