I was wondering how much accuracy one can typically gain by setting up their dies to head space off the shoulder on belted mag handloads

I don't know if there is any "Proof" that the accuracy will suffer or gain but, the brass will sure last longer.

It cut my groups almost in half with my 375

Hey CC, I P-FLR all my bottleneck cartridges because I'm not Hunting in what is normally considered Dangerous Game country.

About every 5 years or so I'll run a Blind Comparison Test with P-FLRed cases vs. Neck Sized Cases. So far, the P-FLR has always shot better "for me" in my rifles. Someone else doing the same Test might have totally different results, but I doubt it.

No idea how much difference there is between FLR(Headspace off the Belt) and good old P-FLR. I have seen some posts by folks who claim their very best groups always come with brand new cases. I have no reason to think they were pulling a clinton on us, but that does seem quite strange to me.

But, I have no idea how much better P-FLR shoots in my rifles, because that is what I use 99.9% of the time. I just proved it to myself many years ago.

Best of luck to you.

quote:

Originally posted by cummins cowboy:
I was wondering how much accuracy one can typically gain by setting up their dies to head space off the shoulder on belted mag handloads

Don't know about accuracy so much, but it sure extends the life of your brass!