Will 7mm Rem Mag blind mag fit 300 Win Mag ammo

[neohiojohn]

I have a 110 in 7mm Rem Mag with a synthetic blind mag stock. Can I just rebarrel to a 300 WIn Mag and have the blind mag work? Thanks.

[RustyShackle]

I believe they are identical. I have a detachable mag sitting around here someswhere, I think it’s good for either.

[PhilC]

300WM case is only .12" longer than the 7RM so don't believe it would be an issue.