Depending on the range you are shooting on, I have a Parker Hale 0.451 2 band volunteer that I used at 200 & 300 yards although I have seen the same model used at 500 yds. This is a very accurate rifle.
Also available is my recent posting of a 0.45 Scheutzen target rifle that I use at 50 metres but I am sure it will go out to 100 metres without a problem.
I have moulds and loading gear for each and I am in white rose county so not that far away if you are interested.
HM