Hi there, I did a quick search on the subject and didn't specifically see what I was looking for so here it goes.

I have a 110 in 300wm that I am making a bit of a project out of.

I have pillar /glass bedded the action, floated the tang etc,

ordered a rifle basix Sav -1 trigger

will have a Farrel 20moa rail on its way this week.

I would like to order a Shilen 300rum prechamber barrel and do the swap to the Ultra, however, I need the guns magazine to still function. Will a 300Rum work in the 300Wm internal box or is there some kind of modifying I need to do to make this happen?

thanks a ton!

Mike.