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Are you familiar with the .270? The .280 is the same except the bullet is .007 inches larger (ooooh, aaaaah). I think the SAAMI pressure spec is lower, but I should double-check that.
.270 = .277
.280 = .284 (true 7mm)
If you reload for your 7STW, any bullets you have would probably be usable in a .280.
I think most folks would recommend something a little heavier for elk, such as a 30-06.
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