I know Alberta tactical and V Bull and Wolverine offer a mag conversion. What I am trying to find out is which one is the best taking into consideration I don't want to lose any C.O.A.L. Then availability(mags) and cost falling in that order. Also I have heard that there is a "tool" that you can use to measure the chamber and throat to get your max. C.O.A.L. I would like to seat my rounds .010+or- off the lands. Any suggestions would be great. But please don't tell me to put a round in the casing and have the lands push the bullet into the casing to measure C.O.A.L. I am simply trying to perfect what I do. Thanks