Hello all. New guy here needs help. I just bought my first double rifle and I want to duplicate, as closely as possible, the cartridge it was meant to use.
Left barrel is inscribed:"450 3 1/4" Solid Taper Case"
Right barrel has: "120 Gr. C & H no.6 Powder 270 Gr. Papered Express Bullet"

I'm trying to find an original 270 grain PP cartridge, or two, to dismantle so I can find out what the actual diameter of the bullet is and to see the wad arrangement. The only ones I've found so far are in a bunch of 20 for $20 apiece. I don't mind paying 20 or 30 bucks apiece but I don't need twenty of them. I'm still looking but in the meantime, does anybody know what the actual diameter of an original 270 gr PP bullet is for the 450 3 1/4 BPE cartridge?

Any info is very much appreciated.
Thanks.
Hank