I have a Pedersoli .45-70 and when I was shooting it, I used grease groove bullets (.459) and 65 grains 2f Goex and would consistently get a 4 inch or so group at 100 yards even with that Lawrence sight, don't panic I can't hit a school bus at 200 yards. So my impression is that your gun will shoot as good if not better than you. The .45-70 is a very forgiving cartridge to load, you really have to work to screw it up. You will have a great time.