Hi,
I had the 1861 Musketoon Parker Hale replica which I used to shoot regularly at Shoreham in kent with the Seal & Sevenoaks R&PC. I used 70 grns of powder which was medium grade, ad it worke well out to 400 yds. I do remember doing some work on the Lyman Minee mould as it cast a little small for my guns barrel. I machined the grooves out a few thou then made a sizing die such that the bullet just ran the rifling when loading. I also made quite a deep plug for the base. I used to lube with lard and also fill the base of the bullet with lard. Once all this was done it shot very consistently and trouble free - a well made gun compared to some of the rubbish replicas out there.
Many hours of enjoyment.
Allan