MM, That should perform a lot like the 6.5-300 WBY. It's a great shooter as long as you have at least 2" of rifling left in the barrel. Anything less than that and you'll loose too much velocity to retain any accuracy. You'll need at least 28 inches of barrel to achieve the best velocities from that monster. I would imagine you should be able to get about 3300 fps with a 140 Nosler. I suggest you start with something like H 870 if you can find it and then move to slower powders. Anything much faster and you'll hit that magic point where pressures rise so fast you won't be able to control them. Good luck and post some results. PLEASE!