Mark X with strange barrel.
Many, many moons ago I acquired an Interarms Mark X in 264 Win mag. It has a Bell & Carson fiberglass stock w/built in sling. Barrel length was 23" in a light sporter profile.
Despite all attempts I could not get it to group decently at the range. Reloading for it also was fraught with problems. Popping primers and stretched primer pockets on the first reload, hard to turn bolt etc. at the starting loads listed in the Lyman guide.
Finally dawned on me that the barrel was badly fouled by bullet jacket material. This was despite the fact it looked OK when viewed with the unaided eye in good light.
Rigged up an electrical copper removal system w 3 v. battery charger, brass rod insulated every three inches with short (3/16" long) sections of shrink tubing. Used vinegar & ammonia solution as the electrolyte.
Plugged her in and within minutes black gunk was bubbling out of the bore. I thought that was a good sign so I left her cook overnight.
Things went wrong overnight because when I cleaned it the next day it showed signs of the steel in the land and groove been eaten away.
Ordered a Adams & Bennett heavy sporter barrel from Midway in 7mm Rem mag and drug it to a gunsmith and had it rebarreled.
The 7mm mag is much easier to get along with.
The original(?) barrel is nothing like I've seen before. The rifling is 12 groove and the relief cut between the threads and the shoulder is 1/4" wide. That left only 3 1/2 full threads holding it in the receiver.
Two questions that I have are:
1. Do you all think this is a made up gun starting with an action?
2. Who or what outfit used 12 groove rifling in their barrels?
Thanks in advance.
Carl in St. Joe, Mo.
Delta co. 1st Bn 8th Inf. 1969.
Plei Trap Valley Duck and Dodge Club.