Try loading them up and leaving them that way for a few days in the gun. I only had one CMC 10 rounder that was that tight but leaving it in the gun resolved the problem for that mag. Some of them were/are much tighter than others but for the most part insert and seat nice and smooth in my Kimbers.
Yes, I do have a mag well, but, nothing like that comes on a SV or STI... I checked the fit @ the mag well, no problems there, plenty of room...
I will have to try loading up the mags with rounds to see if that helps..
Thanks for the heads up guys...
Finely broke out thee mikes and took somer dim's of the 10 rounders... Let's just something wasn't right with them, called CMC and talked to customer service and they said to 'send em back', they started the trip yesterday... I was real supprised they didn't work, I have used CMC 8 rounders for a long time now and like them...