I have a 7 rounder and a 10 round 300 wsm magazine. These are factory 300 wsm not others that have been "tweaked" by me. The 7 round has been used and is an accurate the 10 rounder is brand new and came from mile high shooting.
7 rounder - $50
10 rounder -$60
Never can have to many sold the 7 rounder I'll make a good deal on the 10 I also have 400 pieces of brass to get rid of and 500 190 smk's if you reload