Which of these calibers for a pair of long range rifles?

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I have been scanning the 6mmbr.com site a bit and another 7mm option is to skip necking down to 6.5-284 and just going with the .284.

This guy built a dual purpose long range paper puncher and elk/moose rifle. I'm not sure I would go with the short action and be forced to seat the bullets so deep but to each their own:
http://www.6mmbr.com/gunweek095.html

I can see why you would pick 6.5 or 7mm. I can see why you would pick brass that takes little prep and is available. Outside of that I am still looking for the optimum 6.5 or 7mm chambering. There are a lot of good options out there in both, though I think 6.5mm fits the target range better and the 7mm fits the hunt better. It really is a matter of which you see doing more of the two, if they are to be the same chambering. I think the better target rounds for 600 yards are probably going to be on the soft side for elk/moose at the longer ranges. The better elk/moose rounds are going to be a bit more at 600 yards than optimal. It is a bit of a balancing act that you personally have to decide what to weigh heavier.
 
I don't have any experience with the listed cartridges, but I think the earlier post regarding cartridge interchangeability bears revisiting.

If you're going to have to tailor a load for each rifle, you may very well not get much efficiency out of identical chamberings. You may discover you need to stock two different bullets, separate your brass, and possibly even use two different powders (the target rifle may have stringent requirements, yes?).

I went through the same thing with my .38's/.357. I've currently got 3 kinds of bullets, 3 powders, two types of brass, and two sets of dies. I CAN press many combinations into different service, which is nice but with cast bullets you have to match pressure to hardness which limits their versatility btw .38 and .357 except in a pinch. Jacketed is more forgiving, but also more expensive blah blah.

So beware that you may end up in the same situation and frustrated that you didn't achieve the simplicity that I think you desire (seems to be a theme in your threads). It might be more satisfying to have one chambering each, tailored for the purpose, and develop the perfect load for each. Stock 1 powder and bullet for each and be done. You might even get away with the same powder for both!

-Daizee
 
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