7saum in weatherby feed issues

[jayran]

So I decided to turn a 257 accumark collecting dust into a 7 Saum. Proof 1-9 twist, problem I'm having is I can't seem to get the saum case to feed properly. Tried several modified followers with no success. Any suggestions?

 

[shortgrass]

The MV wouldn't have been my first choice to convert. The SAUM case is larger in diameter than the .257. Therein lies the problem. With a R700, the UM use a different mag box, andddd, the feed rails are farther apart, anddd, the feed ramp is a bit wider to accommodate the larger dia. of the UM case. Got a UM or .378 box for your MV? Just because it can easily be done with a R700 doesn't mean it can easily be done using any other action.