AICS Magnum magazines/Bergara HMR

[Jesse Jaymes]

Hopefully easy question. Have a Bergara HMR in 300 WM. I am waaaay off lands with both 215 Berger and 212 ELD-X. I know the PMAGs that come with the rifle are relatively short COAL. And I THINK internet research states an Accurate Mag AICS Magazine would net me a decent amount of added COAL. But which one will fit in a Bergara? Seems there are 3 different internal mag COAL sizes for Magnums. Anyone have a clue:

Which size will fit in the Bergara?
What the COAL of that magazine allowed?

 

[XLR]

If the HMR is using Magpul AICS magazines then you have a 3.715" magwell. Magpul only offeres LA magazines in that length, so you will be looking at the Accurate 3.715" 300 WM.
Will still allow you to gain about .115" of internal OAL.

 

[Jesse Jaymes]

The info I needed. Thank you

 

[Jesse Jaymes]

Believe that will accommodate my 212 ELD load COAL but unfortunately the 215 Bergers are shooting great -.010” off and still would require a fair bit more latitude. Now to pony up the $100 bill...ouch

 

[metroplex]

I have a HMR Pro in 300WM and the Bergara branded polymer mag that comes with is about 3.73" width measured from the outside, and seems to accept COAL up to 3.6"
I see the Magpul AICS Magnum Long Action mags list a COAL up to 3.5" and seem to be of a slightly different design. There's more webbing at the feed lip area. Maybe I measured the COAL wrong with the Bergara mag. I'm in the same boat and wanted to know if Magpul's ACIS Magnum LA mags would be GTG for my HMR Pro.