7 saum brass vs 300 saum necked down.

[rhovee]

I have read and searched for all the previous threads reguarding this subject. I am having a 7 saum built that will have a .321 no turn neck. Loaded round on 7 saum brass is .3145. Looks like I have enough clearance to run necked down 300 saum brass. I read some comments about 300 saum brass being tougher in the primer pockets. I can get a pretty good deal on (250) 300 saum brass and this should last the barrel. 7 saum brass is hard to come come by right now. What’s been your pro’s and con’s for necking down 300 saum brass?

 

[moondog]

I have just started fire forming some this fall.
So far , the results have been excellent.
I don't know how it's going to hold up.
I've not done any load work on the formed brass yet.
My early lot of Nosler 7SAUM brass lasted
2 firings. Not happy. My Remington brass has been good on my other SAUM.

 

[rhovee]

With the cases being the same size except the neck, is it necessary to fire form them?

 

[moondog]

Well, yes. You want them to fill out to your chamber. That being said, I'm getting very good Accuracy with the sized brass. The Norma 300 SAUM Brass is a bit shorter
OAL. I don't see it as a problem, just a note.
A bit less capacity before fired once.

 

[rhovee]

I don’t have a neck turned and have not been down that road before. I got such a good deal on the 300 Norma brass that I couldn’t pass it up. But I would regret it if I end up having to turn necks and have doughnut issues. Norma 7 saum brass has been out of stock for so long. Maybe I’ll wait tell my rifle is finished (2 months) then see how desperate I am to mess around with 300 saum brass.