Advice needed in brass neck down from 30-06 to 6mm-06

[L.Sherm]

If you don't have the dies to neck them down call bullberrys and have them make you a double ended forming die you may need 2 if your coming down from 30 cal

 

[Hoosier]

I have necked down 308 brass to 243. I would set the lock ring for a full length sized 243, and back
the die out about 3 or 4 turns. Lube the case, and run it in the die. Each pass I would turn down the
die until it reaches the desired 243. I have done it in one pass, but at the time I was necking down

military brass, so I did it in several passes.​

 

[#40Fan]

For a coyote gun, I would just shoot Winchester 25-06 brass. 25-06 die with a 6mm bushing and call it good. You'd probably end up with a slightly tighter necked case that would actually be beneficial. Laser beam out to 300+ yards.

 

[Homerange]

What are your numbers with your 6mm rem? Light and heavy bullets? Thx.

A buddy gets 3250 with Berger 105's in front of RL17 for 1 1/4" 5 shot groups @500.
Enough accuracy for rabbits @ 800+
'Off the shelf' Win 6mm Rem cases.

It would fair mess up yotes !

 

[370bc]

Impressive numbers, for sure! I have loaded and had great results from win brass myself. (I talked to an employees that makes win brass the other day @ the health club. He said they also make rem & fed brass too, just with different head stamps).
My black magic fears are rooted in uniform neck tension. Although i anneal every time, for this build, i want to avoid the possible neck tension quagmire.