shank length

[ARlife4me]

i'll start by saying about a custom barrel w/ a linger shank (say and extra 1"). if going from a short mag to a long mag cartridge within the same action (so thread pitch and diameter don't change) would you still 6have or be able to keep the same used length? or would some shank need to be cut off?

going a different route by needing it chambered again w/the same cartridge after the throat is shot out, how much would probably needed to be cut off to have enough shank to thread? would a shouldered barrel have more usable room compared to a barrel nut type?

asking to find out if it's worth paying the price for having the extended shank?

 

[MagnumManiac]

If we are talking hunting rifle contour, then it depends on the length of the Knox form AND diameter.
If you have two distinct cartridges, one longer than the other, always err on the longer cartridges needs. My rifle, a REM 700 custom switch barrel, has 3 identical barrels and profiles, the longest is the 7STW, the shortest is the 264WM and 257 Weatherby, identical rifle, has 300WM, 6.5-300 Weatherby and 338WM. I find REM 700 LA the easiest to build switch barrel rifles on if you want different case lengths in the same rifle.
The Winchester Model 70 needs to have ALL standard lengths in the standard action and ALL H&H length cartridges in the Magnum action. Mine has 375 Weatherby, 300 Weatherby and 340 Weatherby barrels. Tried to use it for 270 Weatherby, it won't feed that short case, hits the front of the action and jams.

Just to give you a few examples, a Win Model 70 Magnum (375H&H) uses a Knox form measuring substantially longer and larger diameter barrel than a Model EW in 300/338WM. the Magnum could have a few threads cut and re-chambered, but the EW can't.

When we build LR/ELR TARGET guns, we either choose a light or heavy barrel which means a light barrel may be 1.25" at the receiver and 1.25" at the muzzle. A heavy barrel may be 1.5" at the receiver and 1.5" at the muzzle, or a slight taper ending at an inch at the muzzle that begins a distance from the receiver.
This ensures we can cut and re-chamber at least 4 times, losing about an inch at a time.

Doing this on a tapered hunting barrel becomes dicey and I wouldn't do the job to be honest.

I hope this is what you were asking?

Cheers.

 

[bill123]

If we are talking hunting rifle contour, then it depends on the length of the Knox form AND diameter.
If you have two distinct cartridges, one longer than the other, always err on the longer cartridges needs. My rifle, a REM 700 custom switch barrel, has 3 identical barrels and profiles, the longest is the 7STW, the shortest is the 264WM and 257 Weatherby, identical rifle, has 300WM, 6.5-300 Weatherby and 338WM. I find REM 700 LA the easiest to build switch barrel rifles on if you want different case lengths in the same rifle.
The Winchester Model 70 needs to have ALL standard lengths in the standard action and ALL H&H length cartridges in the Magnum action. Mine has 375 Weatherby, 300 Weatherby and 340 Weatherby barrels. Tried to use it for 270 Weatherby, it won't feed that short case, hits the front of the action and jams.

Just to give you a few examples, a Win Model 70 Magnum (375H&H) uses a Knox form measuring substantially longer and larger diameter barrel than a Model EW in 300/338WM. the Magnum could have a few threads cut and re-chambered, but the EW can't.

When we build LR/ELR TARGET guns, we either choose a light or heavy barrel which means a light barrel may be 1.25" at the receiver and 1.25" at the muzzle. A heavy barrel may be 1.5" at the receiver and 1.5" at the muzzle, or a slight taper ending at an inch at the muzzle that begins a distance from the receiver.
This ensures we can cut and re-chamber at least 4 times, losing about an inch at a time.

Doing this on a tapered hunting barrel becomes dicey and I wouldn't do the job to be honest.

I hope this is what you were asking?

Cheers.

What's a Knox form?

 

[Tiny Tim]

Following

 

[MagnumManiac]

What's a Knox form?

The area larger above the chamber on a barrel, this is the technical term. Of course, no taper barrels don't have one.
This term describes the reinforcement of the barrel for the chamber dimension.

Cheers.