re: Reloading question 270wsm 300wsm

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I'm sure you're aware of it, but even loads less than book max can still have high pressures. Rarely my personal loads exceed the max load (at least in one of my handloading book, but not all); sometimes they're less than the max. It depends on a lot of variables.

ETA: How many loads are you getting from Win brass?

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I dont have a chronograph. I thought about getting one, but I figured whats on paper will tell me when i find a good load. It would probably be ideal

Also I loaded .5 to 1 gr over book max before I saw pressure signs on the case, which was flattened primers and some bolt face on the rear of the case. I gradually worked up to that inspecting each case starting at the minimum book rec.

I never loaded any brass until failure so I dont know. I do know that the primer pockets hold up better in Winchester and Rem over Federal.

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As far as my load development, I load up 5-6 rounds in 1/2 grain increments using the same bullet, but usually 1-2 powders. I chronograph the loads and watch pressure signs closely. If accuracy looks promising, I then shoot 3 shot groups w/ the loads that meet my velocity goal. It's worked pretty well and has saved me lots of time and energy.

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So you only load 5 or 6 rounds at like
60.0
60.5
61.0
61.5
62.0 and then only use the velocity you like before getting a group?