Isn't that what sporterizing is? Modifying or converting?
https://en.wikipedia.org/wiki/Sporterising.
Anyway I took the Warren Caster affair to that other thread.
Jeeez Jerry!..... Yes sporterizing is the act of converting a military rifle into a high powered big game hunting rifle. BUT nobody would simply change the barrel to convert a 7.65 Mauser and leave the rest of the rifle with the military trappings.
If Warren Caster had a sporterized military rifle that was customized to utilize the 30.06 cartridge .... Then you can bet that the rifle no longer looked like military rifle.
Mr. BALL. And what kind of guns were they?
Mr. CASTER. One gun was a Remington, single-shot, .22 rifle, and the other was a .30-06 sporterized Mauser.
the other was a .30-06 sporterized Mauser.I guess I read that differently than you.... As I see it that says.... The rifle was a 30.06 Mauser that was sporterized.... While you apparent interpret it as saying The rifle was a metric mauser that had been sporterized ( converted ) to fire the 30.06 cartridge. ( and honestly I do believe that is what Caster intended to say...But it certainly is not what he said.)