I have a Siace 45-70 double and its a great gun. I have a 405 grain load at 1650 fps that shoots about a 1.5 inch group. I have a 300 grain load that shoots the same point of impact as 405 grain but I haven't chronoed it yet. Load is probably around 1850 fps or more. I stopped at these loads because they shot so well I didn't need to improve any. These guns are very nice and very well built. I think they would handle a heavier load and might even shoot better alittle faster. I like the gun so much that I just ordered another in the EL version which is the side plate higher grade with ejectors.

Sam