Sensible loads in match chambers NEVER require fls or bumping. I don’t own a full length sizing die and neck-size only with a Wilson collet that barely touches the case neck. Neck clearance is .005″.

I replace my cases with each new barrel, and get over 100 firings in the 6mmBR. The bolt opens and closes like butter!
David.

Editor: Glad your system works for you. However, you talk about “Match Chamber”. That suggests tight tolerances. It IS wise to bump shoulders. About not owning a FL die — that’s highly unusual. We would say that 90+% of short-range, 600yd, and 100 0 yard Benchrest shooters full-length size all the time. With top F-Class shooters we’d say the number is approaching 99%. I don’t know ANY PRS shooter that neck sizes only for match loads. With any gas gun you MUST FL size.

Regarding the 6mmBR cartridge. I started this site as 6mmBR.com 15 years ago. I’ve shot that cartridge with just about every powder and bullet you can imagine. Accuracy was always “as good or better” with FL sizing, and ES/SD was better with full-length sizing. It is important to use the proper case lube and have a die that is a very good fit for your brass.