I have a new Katadin, 20" Pro Hunter" 45/70 barrel. I have only had time to take it to the range once, but was very suprised and pleased.
I started out shooting Federal Classic factory loads with 300 gr bullets. Got it centered up and shot a three shot group at 100 yards that measured 11/4 inches and was 2" high.
Switched to Hornady factory loads (325gr bullet) and the group dropped to 1" low and 3/4" in a cloverleaf.
I had planned to handload (this is my first 45/70) but the Hornady loads shot so well that I will probably stick with them.
The Katadin barrels make a really nice little rifle.