Reading in my new Speer #14. It says;
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Bearing surface is a major player. [in pressure.]
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I'm not looking for specific information for a specific load, I'm just wondering how much of a "major player" bearing surface is, in terms of starting load calculation?
For example; I am trying to figure up a starting load for a generic pistol bullet, for which there is no load data. The nearest load data I find is for a Speer pistol bullet of the same weight and jacket material, but the bearing surface on the Speer bullet is is significantly shorter than on the generic for my load. Is there anything more specific about this that anyone can tell me, other than to reduce my starting load by ten percent.