I have only shot my 45-70 offhand but it was sufficiently accurate. I have just purchased the Talley mount and mounted a scope, but I have not had it to the range yet (busy with work and family life plus it is miserably hot and humid now).
The only complaint I have is not the gun's fault. Some of my reloads dont extract well. I have determined that is is due to old (read untrimmed) brass. This brass has 6-8 reloads on them without a retrim. Plus all of that shooting was in my Handi or in a Browing 1885 I used to have, not the KP-1 chamber. I have had no such problems with factory loads. Love the gun over all and I hope to add a 44 mag and 308 barrel in the future.