56-50 carbine acuracy compared to 56-50 rifle acuracy at 100yds

[Herbert]

I have been noticing 56-50 carbine users seem to be geting good acuracy at a 100yds with 350 gr bullets,and rifle users including me are geting terable acuracy with the same bullet,I know the twist rate in the carbine is 25% slower in the carbine but i thort this is to fast oversly somthing else is helping the carbine,the rifle has excesive freebore i havent examand a AP carbine so would somone with one mind checking the freebore on the carbine,somthing seems to be working in its favor

[Four Sixes]

Hi Herbert,

I am not sure if excessive freebore between the carbine vs rifle is the problem. I have a rifle and the key is annealing the brass! I holy believing it. Before I had annealled the brass, my grouping was horrible in my rifle and the chamber was dirty as hell. After the annealling, I can see a 180 degree improvement in my grouping and chamber cleaningness.

I used 35 gr vol FFFg Goex powder, used either 0.06" or 0.09" wad behind the Lee bullet from widowmarker mold. I lubed the outside of the bullet and I am very happy with the set up right now. I don't even resize the brass anymore and they chambered perfectly in my rifle. Please see the grouping pictures I had posted in other topic. I got pretty good grouping even after reloading the same brass 4 times without re-annealing. And the chamber and breech block are still spotlessly clean after 30-50rds. I did heighten the front blade and lightened the trigger pull. Got to love my Spencer rifle

Hope this information help. Good luck and all the best.

4-Sixes

[Herbert]

I have always anealed my cases,have tried 4 difrent moulds, with the only one that even aceptable acuract at a 100yds being the lyman 515-141 this bullet is .975 inch long so it fits with the therory of harving the greenhill formular for a twist rate for a given bullet lenth,greenhill recomends a 1-40.3 for this bullet harve that and you have 1-20.15 just on the limit for stabilising this bullet,it seems to work,now with the carbine yousing the same theroy and the rapine 512-350T bullet you have a greenhill 1-52.9 recomended twist rate harve that and you have a 1-26.45 rate ,the carbine having a 1-26 twist rate and the rifle having a 1-20 twist rate should come close to stabilising the bullets mentiond for each twist rate,but youse a shorter bullet in eather twist rate and acuracy will disapear going on my tests with the rifle,with the carbine i think you will notice a big drop in acuracy by yousing the lyman 515-139 bullet which is .733 inch long ,and a big inpovment by yousing the bufalow arms .775 inch long bullet, my experince with the greenhill formular tends to say formular is the uper end of twist rate go above it and you loose acuracy ,go below 1/2 greenhill and acuracy goes out the window,over the years me and some fellow shooters have come to the conclusion that if you go between the uper and lower figers you will get best acuracy,so the best acuracy you will get yousing a .733 inch bullet will be with a 1-39 twist rate ,if the bullet is longer you can speed up the twist rate as in a .775 long bullet preforms very well in original bernside carbine with a 1-34 twist rate,in BP rifles freeboar seems to make a difrence in acuracy as dose the lead into the rifling,slitly taperd seems to work best and cuts down on leading