Hey Varmint guy, always enjoy your posts!
I'm not a Spring chicken! I was shooting p.dogs back when you could still see the Buffalo wallows on the dog towns! Hee Hee!
I know that you have a boat load of guns. Many of the reloading manuals are crap today....lawyers killed the ballisticians!
I am shooting the 50's at 3600+ out of my Hart barrel'd 223 with a minimum spec chamber with zero freebore using 133, IMI brass, and CCI BR -4's. My buddy shoots the exact same loads in is several customs, so I know that it is no fluke. On the calm days, groups in the high 1's and low 2's are no big deal with the 8-32 that rides the rifle...shore nuff BR competitive...then again, I had rather turn queer than to shoot another Registered Benchrest match.
I'm loading the 55's at 3500+ fps with N-135 and so is my buddy in his 3 customs...again, no big deal in IMI brass.
The reloading manuals are only a guide, you have to rely on your rifle to tell you what is the max load...and it can't read! Hee Hee!
Keep the posts coming...love them all!
Send my a PM and I'll give you more info...I know you are no dummy.