bruce moulds
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Being it's built on the .30-06 Springfield case rather than the .308 Winchester, when loaded to potential the 7mm-08 won't be able to keep up with it. The .280 Remington is very similar but has the added advantage of bullets selection. The only draw back to the .270, and that's a minor one, is your pretty much limited to 150 grain bullets. The .280, being a .284 caliber bullet is slightly bigger than the 270 (which uses a .277 caliber bullet). The 7mm bullets on the market are all .284 caliber, which gives you more choices and allows upwards of 175 grain loads.
But again, many people herein have said they've taken all kinds of plains game with the .270. Some PHs think it's a bit light for the bigger game, but that's mainly because they're looking for a margin of safety in case the client doesn't put the round exactly where it needs to be.
the increased killing power of the 280 IS noticeable over the 270 when comparing bullets of similar sectional density and construction.
trajectory is the same, certainly with handloads of similar working pressure.
9 1/2 twist will do 175 gn hunting bullets as long as they are not vld type, none of which are good hunting bullets for anything but smaller game.
bruce