What can I do with an old AW barrel?

[Mr_Happyface]

.300 Winmag bolt face caliber.

I have the replacement in hand and I'll be installing it later this month. I was thinking about taking the old one and getting it installed on some other rifle so I can use it to fireform brass.

Problem is I'd have to have it re-threaded, which means I'll have to have it chambered as well (I have a reamer). Don't GAF about accuracy or anything else, seems like a good idea to me as I'll save on the life of my new barrel, but I don't know if the math adds up. Also, not sure what donor action I'd use. (Bartlein MTU profile)

Has anyone done this?

 

[Entropicitis]

Tomato stakes in the garden

 

[Ronin22]

There’s a guy that teaches barrel chambering to the youth shooters. He’s in Austin. I send my old barrels for them to learn on. PM for info.

 

[Wannashootit]

I don't know if the math adds up.

Not even close IMO.
Never owned a belted magnum- but seems like a bad idea to me to fireform the brass in a completely different rifle.
While the belt to shoulder datum dimension would be consistent from the same reamer, the belt to boltface dimension is most certainly going to vary. If you've got five thou clearance to the boltface in the "fireforming" rifle/barrel, and one thou in the new one you aren't going to be able to chamber that ammo. Brass stretches both ways...

I'd fireform to blow out the shoulders in the rifle you'll be shooting with a reduced load.

 

[Mr_Happyface]

Not even close IMO.
Never owned a belted magnum- but seems like a bad idea to me to fireform the brass in a completely different rifle.
While the belt to shoulder datum dimension would be consistent from the same reamer, the belt to boltface dimension is most certainly going to vary. If you've got five thou clearance to the boltface in the "fireforming" rifle/barrel, and one thou in the new one you aren't going to be able to chamber that ammo. Brass stretches both ways...

I'd fireform to blow out the shoulders in the rifle you'll be shooting with a reduced load.

Yeah that's kind of what I'm thinking. Although this is just a .300winmag sized bolt face, it's a non-belted wildcat. The brass I have is factory made, but it's super small for my chamber and the first firing is more or less a throw away.

Maybe I'd be better off firing all the brass I have through the current barrel, then changing it.