Hi Guys, I own a fine Jeffery double in 333 Flanged. It was made in 1912 and once belonged to the Maharaja of Sonepur, has a scalloped action, heel and toe plates and full scroll engraving. The bores are frosted but good and I have been able to get decent regulation using R22 and R15. The rifle is accurate (i.e. each barrel shoots to the same point of impact with consecutive shots), but it still doesn't regulate as well as I'd like it to. Am thinking of trying IMR 4831 or other powders. Any thoughts? Have any of you worked up handloads for a 333 double? Thanks for any help. Keith
PS On top of the barrels is inscribed "250 grain bullets". I think most Jeffery doubles were regulated for 250s. The proof is for 42 grains cordite and 300 grain bullets.