Originally Posted by
sharps4590
Venturino covered that as well, usrca, when working with I think an original 44-77 Sharps, a cartridge quite similar to the 11.15 X
Go, and whoever posted firs, I couldn't find your reply. I apologize.
It's 1870's, MAYBE 1880's and is definitely a BP rifle. The difficulty was attaining enough velocity to bring the barrels together. Grahame Wright in his book, "Shooting the British Double Rifle" gives examples of several BP doubles that had to use duplex loads to achieve enough velocity to regulate. Well, ballistics don't care if they're British, German or American so I ended up with a duplex load of 5 grs. of SR-4759 under 68 grs. of the old GOEX cartridge, ignited by Federal 215 primers. All that under the Lyman bullet at 350 grs., not sized but lubed only. Swiss wouldn't regulate either and Old Eynsford came the closest but they weren't good enough to hunt with...and barely to plink with and hit anything. I have about 1 1/2 lbs. left of the old GOEX Ctg. If I outlive it, I guess I'll have to try to work up a load with the few pounds of Old Eynsford I've hoarded. Schuetzen has showed promise as well.
I'll say this, those duplex loads shoot about as clean as smokeless, even at that low percentage.