Re: New barrel caliber
Everybody talked all around the 25-06 but it is a really nice cartridge. Not the fastest 25 cartridge but still really fast.
Fits your bolt face, action and brass. Great long range varmint round, really good antelope, deer round. Pretty good bullet selection in 25 cal.
If you like the double radius (and I do), the 240 weatherby fits the 30-06 bolt face. Range for deer will not be quite as good as some of the larger calibers mentioned by others but will be good for the ranges you mention - 300-400yds AND THEN SOME MORE. I am using it on a F N mauser action and am happy, do not know anything about it on a Rem action. Cost of brass may be a little (or a lot) more but how often do you buy new brass.
The Smokin Fur Rifle Club