The 7 mag is a lot easier to reload. The 300 loads that are the most accurate are compressed loads and that means you have to tap the brass to get all the powder in. The 7 mag is also double charge proof pretty much
I think you'd better go back to reloading school there billo. Not all loads in the 300 are accurate when compressed loads and if you think just because it is a 7mm mag it can handle all the powder you can put in it you are going to be very surprised if not dead.
This post is 2 years old! That's digging deep.
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