re: Reloading question 270wsm 300wsm

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Lapua only makes Military and BR calibers. Not many hunting calibers. Norma is expensive.

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In the last couple of years Lapua has expanded their line of brass to include a number of common hunting calibers as well. And yes, Norma and Lapua are expensive, but that can be relative. For example, when it's available, 221 Fireball brass by Rem runs about $50/100. Lapus is $73/100. Brass prep steps I take w/ Rem to improve accuracy (uniforming the primer pocket and deburring the flash hole) don't need to be done w/ Lapua. W/ Rem brass, I cull about 20% of the brass because of unacceptable neck thickness variation; w/ Lapua it's 4%. One batch of 221 brass from Rem had poorly annealed necks so that on the second loading I lost 40/50 pieces of brass due to split necks. Sadly, neither Normal nor Lapua make 270 WSM brass.

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Explain please.

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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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I am loading under a full grain from book max and 4-5 shots is all I could get with Federal. Winchester has lasted longer.

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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?