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Old 04-29-2012, 09:37 PM
spaniel spaniel is offline
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Join Date: Jan 2012
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Do you have access to a chronograph?

1) Every gun is different. I trust the powder manufacturer's data #1, all other sources are of increasing suspicion. Even with reliable data, I start with a low range load...with every gun...and work my way up. It is surprising how different pressure can be in two different guns with the same load.

2) Better safe than sorry. I rarely approach max loads.

3) Velocity is never free. If you are expecting a certain velocity from a certain load, but you reach that velocity at a lower powder charge, chances are that that particular gun is running higher pressure than the test platform from which you are using data. A chronograph is your friend. I have a single gun...a 300WM...that I routinely load over max loads. However it consistently runs low on velocity for a given load, across a variety of data sources. For some reason it just takes a bit more powder to get the right velocity (and hence pressure).
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