Re: 7-300 win mag Why not?
In my judgement, you have a weak motive. Sell your dies on ebay or similiar, and chamber a barrel for one of several 7MM cases. if that's what you must have.
Years ago, I thought I desperately needed a 7MMRemMag. But, I got a deal on a 300 Winchester. After comparing all the data, I wondered what I thought was so great about the 7? Now, like everybody else, I can (and do) select numbers that favor the 300.
I firmly believe that there is not, one best solution. There are a number of solutions. Unless you are the type that needs something different, at any cost, I'd stick with what you have. It's a good one.
Good hunting. LB