Building a rifle...

I agree that the 6br is not good for quick kills at long range (beyond 800 yards) or even closer.

If I was building a specialty long range rockchuck gun. I personally would build a braked 300WSM. The idea is the bigger bullet diameter will put a bigger hole in the varmint. Bullets tend not to open up well at these low velocities.

I use the 8.5-25x50 right now, it works well for this purpose. You might check into the new Sightron 8-32, its bigger and heavier. But its less money and seems to have alot of good features.

If you get a chance, read the book "PRECISION SHOOTING AT 1000 YARDS" there's a real cool article solely on shooting long range rockhchucks.
 
Your ducks need to be lined up better than they are. You need to decide just how this gun will be used and how completely you want to do the job. Rockchucks at 500 are one thing. Get out past 600 and to 1,000yds, it becomes a whole different ballgame. To really do it can take you into another league of big cartridges. Again, this isn't the same as putting holes in paper. You want mayhem out there, not just a hole. People like to throw these long range numbers around casually, but in real life and those distances you'll be shooting at them a lot more than you'll be hitting them.

The Rem. short action magazine box is about 2.850" inside and there should be a bit of wiggle room. The .284 case is about .050" shorter than a 6mm case, but length to neck/shoulder junction is the same. So the length difference is in the neck. With a 0 freebore chamber, a 70gr bullet seated to the lands in either case will fit the magazine just fine. So will an 87gr Vmax, but it goes well below the neck/shoulder of a 6mm case and even further with the shorter-necked 6-284 case. If you have a chamber throated for heavier bullets and seat an 87Vmax to the base of the neck, neither case will fit the magazine.

Now, if this is a 6mm on either the 6mm or 284 case and you use it single shot with loading block, fine. If you go to something with longer heavier 6.5mm (.264") bullets, even single shot forget it. My .257AI (same case as 6mm) is on a short 700 action. Used as a single shot with 87gr bullets seated deep for a 0 freebore chamber, those cartridges are much longer than the loading port. An unfired round doesn't easily eject. Doing it over, no question I'd use a long action. If when the time comes you decide on something like a 6-06 or 6.5-06, you'll absolutely want a long action. If you want a gun that'll shoot flat and make the guts fly, have a .257Wby reamer made with minimum spec's and 0 freebore....100's at 4000 do a real good number on rockchucks.

The Savage short action is considerably longer than a Remington short action, it's closer in length to a Remington long action.

Again, you need to get your ducks more in a row.
 
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