Action question

[bushwackr]

I currently have a montana 99 action chambered in 300 win mag with a 3.650 mag box. Does anyone know if I can have the action opened up and use a wyatt mag box for the stw?

 

[Lefty7mmstw]

I currently have a montana 99 action chambered in 300 win mag with a 3.650 mag box. Does anyone know if I can have the action opened up and use a wyatt mag box for the stw?

If you have a 3.650" box you will actually be sitting rather well with a simple re-barrel to 7stw. The 7stw rifles I've seen are throated to 3.800".

 

[bushwackr]

Oh ya duh for some reason I was thinking the round was longer. Ok and does any one know if i can headspace with the same gauge.

 

[Lefty7mmstw]

belted = belted

BELTED MAGNUM CARTRIDGE HEADSPACE GAUGES | Brownells