shank length

MagnumManiac said:

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.

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bill123 said:

What's a Knox form?

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ARlife4me said:

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

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sable tireur said:

Unless you exceed the standard length of the barrel maker's steel, there should be any additional cost. I've been ordering and making barrels with longer shanks for 20+ years with no cost increase. The only difference can fall into the category of additional weight and maybe a little bit with balance.

I have found that if set backs are required, that extra length in the tenon allows me to cut off that threaded section and start relatively fresh. From short mag to long mag, you achieve a reasonable clean up on the throat, not complete in some cases but some anyway.

It becomes required for me when you examine RUM chambers and those of the larger, longer cartridges when that extra length can contain most of those cartridge cases. The 1.25" diameter improves the overall when compared to the 1.200" diameter. Some of those bigger cases have me reaching for the 1.35" diameter steel to make those barrels.

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