WOW..Will a 7 rem approach/equal 7mm weatherby performance?

Yes,IME with 26" barreled, long throat 7RM,VS my 24" 7wby, the RM will duplicate it.I have no idea what the pressures are tho.

Using Wby data in the RM? absolute horseshit. As BOBNH knows, some 7wby data will redline a Mashburn, think what thats going to do in your RM.

I load a lot for both, NEVER has the RM max been within 3 grains of what i've used in my WBY. My personal info is based on heavy bullets tho, maybe data on lighter bullets is closer, i dont know..But if you plan on using WBY data in your RM, you better be packing along a hammer to open the bolt.