Thread: 6mm BR Norma.

6BR is great. 1:8 barrel, AR2208, Small rifle primer and a 105 Amax. I had one that I ruined and am gutted about it.
Its popular so you're not overly custom for dies and accessories.
Its efficient and inherently accurate.
Its fairly cheap to run if you don't lose too much brass.
It won't feed reliably from a magazine in most rifles. I think the T3 might work better than the Rem700 clones.
Its that good theres a website 6mmbr.com dedicated to it and other accurate cartridges
Theres great bullets available. I had a good run with Hornady 105 Amax and 87 Vmax. The VMax was a great goat and bunny killer.
Id get another in a heartbeat if I could justify it and had more time.