Input for new action for 300 RUM

robert l

Well-Known Member
Feb 28, 2016
manatee county florida
I am looking into building a new 300 RUM.

My goal is to use the 181 Hammers.

I have a Montana Arms 300 Rum, but the bullets need to be seated so deep in the case, I loose allot of case capacity.

Ideally, I would like the seat the bullet with the top of the boat tail at the neck/shoulder junction.
Ends up being 3.850" OAL.

Who makes an action that will accommodate a loaded round up to 3.900"?

Currently, I am considering Kelby's Atlas, but I am open to other recomendations.
I built a 338 edge with a borden timberline action stainless. And it came with 3.850 mag. and the bottom metal. i bought directly from borden. I have used alot or most other actions. And borden ranks at the top of the pile. check them out it may be the way to go.

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