.58, Tapered Vs. Straight Depth Grooves

[nkbj]

Thinking about getting a barrel rebored to .58 for hollow and plain base bullets, lubed as well as paper patched.
Has anyone noticed substantial benefits to going with the tapered groove depth rifling?
Good points?
Bad points?

 

[rafterob]

I have not even heard of that so I am curious to knowledgeable replies to this post.

 

[Billy Boy]

Thinking about getting a barrel rebored to .58 for hollow and plain base bullets, lubed as well as paper patched.
Has anyone noticed substantial benefits to going with the tapered groove depth rifling?
Good points?
Bad points?

Are you referring to a choke bored rifle barrel ?

 

[nkbj]

The groove depth greater at the rear than at the muzzle.
Bore diameter remains the same.

 

[hawkeye2]

Are you referring to a choke bored rifle barrel ?

No he's not. The Springfields had progressive depth rifling starting with groves .015" deep at the breech and tapering to .005" at the muzzle. The twist was constant at 1 turn in 72". Not to be confused with gain twist rifling where the rate of twist changes, usually from slow to a faster rate. I only know of one person doing progressive rifling and he only makes new complete barrels for Civil War guns. I am not aware of any benefits over conventional rifling though the original Springfields do shoot minies very well. The barrels made by Whitacre (progressive) have a great reputation for accuracy but so do the more conventional jobs by Hoyt.