I maybe just thinking out loud. But need to get a confirmation.
I have a very nice Daudeteau carbine, and have started to try shooting it. Slugged the bore, which is very good shape, and it comes out to about .267/8.
At the moment I have some different boolits of Carcano style and a Lyman clone, not the 469 number, but the bore rider nose style of around 150gr. Brass is Buffalo Arms resized from 45/70.
So, I'm assuming that right there maybe my problem.
Only .264 140gr. Jwords chamber, but don't shoot worth a hoot. That was just a load of 30grs of IMR 3031. I tried Carcano dia. Jwords, bolt will not close but very hard. If I try a bigger boolit, they don't chamber well, but very hard to close the bolt if at all possible. I'm not even sure if I should try make it happen, as to possible high pressures? Maybe just pull the bullets and start over.
Being 45/70 brass is necked down that far, should I be neck turning the cases? Neck wall thickness by caliper is .015/16. Anything else I may be missing?
Thanks.