300 Win Mag / 7 Rem Mag magazine question

I want to build a 300 win mag and 7mm rem mag switch barrel rifle on a Stevens 200 long action with staggered feed blind magazine. My questions are:

1. Will the 300 win mag magazine support the 7mm rem mag without any changes?
2. Any other modifications necessary?

Thank You.

1. Yes
2. No (other than the barrel)

Both the .300 win mag and 7mm rem mag are based on the .375 H&H, and the magazine should be able to support any COAL that you want to shoot through it.

Literally building the same exact rifle right now down to the action, although it's going to stay as a .300 win mag for a while.

Thanks for the info!

+1👍
Only problem with staggerfeed is the max oal is 3.4-3.42"
That's to short for the heavy secant ogive type bullets. That's why I sold my staggerfeed 300wm and am doing my "NEW" 300wm build on a centerfeed action.