I noticed some information on the 6X39 cartridge and I want to give a little of the history that I know. About 1984 I bought a heavy bench rifle built on a Hart #4 action from Allan King. King has apparently been involved in the design of this cartridge along with Jim Stekl and possibly Mike Walker from Remington. The cartridge was written up in Rifle magazine, but I do not have a copy of that article. Maybe someone on here has one.
The cartridge was based on the 308 case, shortened and necked to 6mm. It differed from the 6BR, which it predated by a number of years, by having a radiused (ala Weatherby) 45 degree shoulder. I am really not sure what the case length spec was since my cases measured a good 40 mm and there was never any sign of the excess pressure one would expect from too long cases.
Unfortunately I sold the gun with its 308 barrel (it was a switch barrel gun) and keeping the 6 mm barrel, had it rethreaded and chambered to 6 PPC. Due to a variety of circumstances I have not fired that barrel since.
The very nicely made sizing and seating dies just disappeared over the years.
Another interesting fact is that King apparently preferred a 1 in 16 twist for this caliber and that is what this barrel is. I have never actually confirmed that.
Apparently there was a set of forming dies made by RCBS around somewhere, but I was never able to put my hands on them. They were supposed to have cost $250 which was a fair amount of cash back then.
The cartridge was based on the 308 case, shortened and necked to 6mm. It differed from the 6BR, which it predated by a number of years, by having a radiused (ala Weatherby) 45 degree shoulder. I am really not sure what the case length spec was since my cases measured a good 40 mm and there was never any sign of the excess pressure one would expect from too long cases.
Unfortunately I sold the gun with its 308 barrel (it was a switch barrel gun) and keeping the 6 mm barrel, had it rethreaded and chambered to 6 PPC. Due to a variety of circumstances I have not fired that barrel since.
The very nicely made sizing and seating dies just disappeared over the years.
Another interesting fact is that King apparently preferred a 1 in 16 twist for this caliber and that is what this barrel is. I have never actually confirmed that.
Apparently there was a set of forming dies made by RCBS around somewhere, but I was never able to put my hands on them. They were supposed to have cost $250 which was a fair amount of cash back then.
