Recent 7 Rem Mag play time has involved these rifles:
M70 Classic action, Brux #2 9 twist,std that and box. Bansner stock.
M70 Classic action, Brux #2 9 twist, std throat.RBorden RR stock, 6X SS MQ
Interesting thing is that both these cut rifle barrels will show markedly different max charges than my custom 7 Rem Mag which uses a Douglas barrel, despite throats being more or less standard for all three.