.500 MDM Ultra Sep 22, 2010 | News & Updates This is the caliber shown in the “Bigger Gun” video clip and this monster is the first animal taken with it. If you like BIG guns, check out Michael’s selection at www.b-mriflesandcartridges.com. Facebook Twitter Pinterest Google+ 2 Comments Michael McCourry on September 23, 2010 at 7:01 AM This is gun #1 of the 500 MDM rifles! I tried a couple of standard Winchester stocks on this rifle before going to a Accurate Innovations stock. I busted both of those stocks, 1 stock cracked in 18 rounds, the second one in 4 rounds. Time for an Accurate Innovations stock! This one is my first Myrtle stock and it now has well over 500 rounds through it without any issues at all. All rifles built in 500 MDM now get an Accurate Innovations stock as standard. Michael Michael S. on October 31, 2010 at 3:09 PM Looks like that rifle and that stock both do their jobs just dandy!!! (Well over 500 rounds – your shoulder OK? 🙂 ) Submit a CommentYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Notify me of follow-up comments by email. Notify me of new posts by email.