I have a Katahdin barrel in 45/70, and I love it. I have heard a lot of people complain about muzzle blast, but any added muzzle blast from the brake dosn't bother me. The load I shoot most, and hunt with is a 300gr. remington over 50grs of RL7. I do not find the recoil with this load any more than a 30/06. When I first got the barrel I wasn't real happy with the groups that it shot. It shot well enough for deer hunting, but I expect a little better than 4 inches at 100 yards. I had the barrel throated and it improved the groups a good bit. It will now do three shots touching at 100 yards. I never really tried to many differant loads because the one mentioned shot well enough to please me. I have a leupold 2x7 on it. I have taken a number of deer with it and the remington bullet does a great job. One buck I shot that was faceing me at 40 yards, the bullet entered his brisket glanced off his spine, traveled on through its hind quarter, and ended up just under the hide at its back end. I think it was dead before it hit the ground. I can't ask for much better performance from a bullet then that. The recovered bullet weighed 208grs.
The 300gr. Rems are fairly cheap compared to other bullets. As I mentioned I love this barrel on my Encore. It is light weight, and it nice handling. Most of the hunting I do is in crab apple thickets where 75 yards is the longest shot. I have also done some open field hunting with it. The longest distance I've taken a deer with it is 175 yards. I never hunted with a 45/70 untill I got this barrel, and I find it hard to leave it in the safe when deer season rolls around.