Re: Best DBM for WSM?
A-max's on a whole have fairly short bearing surface. Even with the short neck of the 300 WSM cartridge, seating the 178 that short is robbing performance inherent of the cartridge design. If you are stuck running this COAL due to a short throat you should be fine with the standard bottom metal and mag offerings though I couldn't tell you if the WSM cases will fit the 308 style mag and follower.
Never asked, are you running a short or long action?