Charls,
Rigby sounds a nice rifle. Surely the proof marks had the weight of bullet it regulated or, perhaps, the Rigby records can help?
Couldn't regulate my H&H with either IMR4895 or IMR4350 and the 215 gr. bullet. Couldn't get better than 3+ inches composite group at 50 yards, totally unacceptable with a .303, so it's now with JJ Perodeau at Champlin arms for regulation and a few other touches including extra strikers, foresight and a few other matters. Hopefully it will be ready to go to South AFrica and Namibia with me in mid-July.
Best for the New Year, Tim
