re: Reloading question 270wsm 300wsm

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Depending on the brass, it will not last a lifetime.

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Sure, there are a number of factors in play, but when dealing w/ a big game rifle, as long as the pressures are not excessive and the brass is high quality, #100 pieces of brass would last me a lifetime. Once I have an established load, a #20 round box of hunting ammo will last a couple years.

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You have to develop the load which means shooting 3 shot groups minimum with different powder weights in half grain increments. Next you have to play with the bullet seating. Which is more 3 shot minimum groups until you find the one your gun likes.

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Through the years, I've refined my load development process so that I don't shoot nearly as many rounds as I used to. I don't shoot 3 shot groups until the final stages. I pick the ONE bullet I'm going to use and load it w/ 2-3 appropriate powders. I don't try different primers. Very rarely do I play w/ bullet seating depth. I usually have a final load after shooting <25 rounds.

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Some Federal cases wont hold a primer anymore after 4-5 shots in my experience and that brass has to be thrown away.

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You're right to trash brass w/ loose primer pockets. I've not personally used Fed brass, but it's apparently known for developing loose primer pockets. Loose primer pockets after only 4-5 loads would suggest either poor quality brass or a load generating excessive pressures. When I started handloading i used either Rem or Win brass. A few years ago I started loading for a 6 Rem BR handgun that required Lapua brass. That stuff is GOOD. Now I find myself using more Lapua. Norma brass also has a really good reputation.