7mm-300win mag

[HillBilly_Sniper]

Im building a 7mm-300 win mag on a rem 700. I want to shoot 180gr Bergers vld with Norma brass. Is anyone using this combination? What is your fired case neck diameter, your loaded round neck diameter and your re sized neck diameter? Im trying to figure out what my reamer neck clearance should be? Does anyone have a reamer setup for the 180? Any info regarding the round would be greatly appreciated!

 

[matleez]

I cant help you with the norma brass but I run a neck bushing .314 with 180s and then I run a expander manderal through just to ensure the necks are perfect. I can message my Smith about the reamer specs

 

[matleez]

This is what he just sent me for specs not sure it will help on freebore.

 

[HillBilly_Sniper]

Thanks Matleez it’s a start. May I ask what powder you went with and what kind of speeds your seeing?

 

[matleez]

im using retumbo with 180s at 3100 out of a 24 inch bbl

 

[W54/XM-388]

Here is a good article all about that wildcat:

https://www.ballisticstudies.com/Knowledgebase/7mm+Practical.html

 

[Bradu]

Here is a good article all about that wildcat:

https://www.ballisticstudies.com/Knowledgebase/7mm+Practical.html

Isn't the practical an improved version?

 

[swhiteh3]

Definitely read that article and consider the 7mm Practical. It's definitely a mild improvement on the traditional 7/300.