I had contradictory information and didn’t study it out. I will reach out to Stefan about it.
The bushing included will fit the long mags. Per specs, the opening is .543. 300 win mag is .532. It has clearance of .011.
Here are the dimensions off the internet I just pulled. I don’t know more than this at this point.
Body size:
300 mag. .532
300 wsm. .555
7 saum .5512
6.5 prc. .532
7 prc. .532
300 prc. .5230
Personally, I will drill, sand out my mag bushing to fit my saum and run everything with it.
But, I will get details and order and stock the necessary bushings for whatever we need.
I will update the order form. You can add the bushings you want to the order. Stefan can do the bushings and it won’t delay your shipping by more than a week or so.