I'm looking at a 1956 (SN 3738XX) Winchester Model 70 Standard Grade that has been rebarreled. The left side of the barrel just ahead of the receiver is stamped in two lines: Chas. Tebor / .220-250
The lettering is about 1/8 inch high, sans serif, and appears professionally done. No provision on the barrel for either front or rear sight. Excellent bright blue finish on the barrel that contrasts with the matte finished receiver. Receiver is tapped for scope mounts, but no scope present.

Google yields nothing on either Tebor or .220-250. A genealogical search finds a couple of Tebors, but no gunsmiths. Given the time frame, my guess is this may be one of the wildcats that eventually led to standardization of the .22-250? Or perhaps a post .22-250 "improvement"?

The firearm is in the collection of a local museum, so I'm only seeking information on the gunsmith or barrel maker and the caliber. It isn't for sale, of course, and I don't have the facilities or permission to do a chamber cast.

Thanks in advance for any information you may have, or any speculation you wish to indulge in.

Is it possibly a .25 caliber bore bbl ?
If it is maybe the cartridge is a .220Swift necked up to .25cal wildcat.
In Brit-gun-speak,,the caliber would then be a 220/250.


I'm not familiar with the name at all, and it may just be a 22-250 caliber chamber. The stamping done with a bit of flair by adding the extra 0.

I'll check the bore next time I have access to the firearm and post a response.

The 225 Winchester replaced the 220 Swift in the Winchester line up somewhere around 1964. I'm thinking a .220-250 might have been a development wildcat/name prior to the introduction of the 225 Winchester. I'm not sure, but it makes sense to me.

Maybe British? They like expressing calibers using three digits. If it was done anytime around 1956, it would have been one of the multiple .22-250 wildcats as that caliber wasn't standardized by Remington until the mid-60s.