45 -70 rifling and twist

[oops]

I am a bit unsure ....

If I am building a 45-70 that is going to shoot nothing but cast bullets....are there barrels out there that have deeper rifling for this sort of thing and what twist should look at..

All I seem to find is 16 twist and .010 grooves....wouldnt 20 twist and 15 thou grooves be better


TKS


OH ya........black powder only, possibility duplex loads

 

[Brutus]

Faster twist should favour heavier bullets. My best guess says the 1 in 16 should work fine with bullets of 400 grain and upwards. That's all I have to say on this matter as there are far more knowledgeable heavy cast BP shooters than myself on this forum.

Cheers

 

[ben hunchak]

The Marlin "Ballard" cut rifling barrels are very good, for after market, Badger barrels are tops esp. for cast bullets, my Badgers are all 1-18" with deep cut rifling and very accurate. I haven't had as much luck as some with button rifled big bore barrels, my Douglas and Green Mountain barrels are just not as accurate as the Badgers. The other alternative is a Ron Smith Barrel from Alta., although he is about 6 months or more behind.

 

[Aries-]

i use a 1-18 twist for my 45cal muzzy shooting 530 grain bullets. and it groups very very well at +100 yards (1-2 inches at 50 yards before full stability with 120 grains of ff blackpowder, with a paper wad between bullet and powder.)

 

[Ol' Flinter]

My Pedersoli Sharps 45-90 has 1:18 twist and does well with the cast bullets I have tried from 405 gr to 525 gr. I load for best possible accuracy and use 65 to 75 gr FFg, depending on the slug.