Barrel specifications/suggestions

[tractorkid]

I did some looking around at different places and I think I just may have a 72 cal made this winter. But I do have a couple questions. I would most likely be using patched roundballs the most. I was thinking to have around a 1 in 70 twist, how does that sound to you guys?? And do you guys have any recommendations as far as depth for rifling?? Any suggestions would be great Thanks Guys

 

[John Taylor]

1 in 70" may be a little fast for a 72 round ball barrel. It depends on how fast you are pushing the ball. A few years back there was a round ball calculator on the web that helped figure out twist rates for caliber using the volcity you plan on using. Some of the higher volcities for a 72 showed a twist around 1 in 140". Rifling depth around .010"- .012" should work fine. You might try calling Jim Carpenter,208-245-3693. He bought Orion Rifle barrel co. a few years back. He might have some good idears about twist on a 72.

 

[George Holton]

I think that deep rifling is best16/18 K

 

[Mike Brooks]

I've gotta ask, why a .72? Have you shot big bored rifles before? Are you recoil sensitive? Do you plan on using this only for hunting?
None of my business, but if you don't have alot of experience these big bored rifles, they will give you some bad shooting habits you may never be able to break.
I like a .62 cal rifle for big game hunting, I don't think there is an animal in north america it won't kill. As far as shooting the .62 in competition for a day, I don't think it would be a great experience. All that recoil will really add up after a while. I can only imagine what a days worth of pounding from a .72 cal rifle would be like.
All I'm saying is, a .72 cal rifle is a whole lot of gun, and may not be so cool after you've pulled the trigger. I would seroiusly consider a gun like this if I were exclusivly hunting grizzlies or was planing a safari to Africa to hunt dangerous large game, otherwise it's just not practical. In my opinion any way.

 

[Le Grand]

For info on a .72 caliber rifle barrel, talk to Oregon Barrel Co. c/o[url] www.thegunworks.com[/url]. Le Grand

 

[rich pierce]

Make sure you get at least 8 grooves. The larger the bore, the more grooves needed. The larger the bore, the greater the surface area of the contact between patched ball and barrel. It can be hard to seat the ball if you have a good patch/ball combo that gives best accuracy. Narrower lands and wider grooves than usual can help.

I'd make a wall gun in .72 and many were about that size. In a nice 35 pound gun with a swivel, this would be pleasant to shoot.