I have both Caldwell bags and like the one that uses the mount and not the Velcro strap.
Have not had much trouble fitting it to rifles with different scope mounts,never shot more than 20 rounds before emptying the bag.
I got 2 bags and several of the mounts to put on other rifles.
Did find that the velcro bag works but you have to bend the steel bars to really get a snug fit around the handguard.
