The 6UM

[Ryan Avery]

How bout this, let's not even associate 6um 30° with 6saum, because they're not the same thing. Headspace for the saum family of cases has been saami spec's since 2001.

After near 25 years UM says that their version of a 6saum isn't the same headspace as 6.5 7 and 300s have been using. Reasoning for this, UM get to set the standard since nobody has ever made brass for a 6mm version of saum(Jake's exact words). Decisions were made at UM to make them not interchangeable, why, well we can all makes guess on that.

The purpose of the brass wasn't to get 6 Saum brass. It was to get 6UM brass. The spec is where the shoulder sits when ADG necks it down.

 

[Tx_300wsm]

I’m wondering if I should change my 6um brass order to 6.5 saum and neck it down the …old fashioned way? I’ve had my prefit 6um barrel for a while now. Will I have issues using the 6 um brass or will I be good to go with fire forming?

 

[The Guide]

I’m wondering if I should change my 6um brass order to 6.5 saum and neck it down the …old fashioned way? I’ve had my prefit 6um barrel for a while now. Will I have issues using the 6 um brass or will I be good to go with fire forming?

I believe the 30⁰ 6UM is the one they are waiting on the reamer for. The 40⁰ that needs to be fire formed is completed and unchanged.

Jay