Try Win 748 powder with CCI mag primers .. had 5 shot group with CZ that could be covered with a dime at 100 yrds with 52gr Sierra hpbt - 28gr pwd .. great little shooter .. MB

Assuming you are performing other tedious brass preparations as well, I would sort/keep brass that aggrees within 1%-2% of the average for the best loads. In practice though, this may not make much difference unless your weights are very non-uniform.

A couple of thousanths should be fine, but stick with one OAL while you are playing with powder charges.

Belive it or not,,de-burring the flash holes had the most pronounced effect on accuracy than anything else in my .223's.With 40 gr. pills,,,you ought to try a pound of imr4198 wth rem.7 1/2 primers through it.After you get over the crunching while dropping the charge,,,You may be pleasantly surprised at the range,,Clay

You know, I did deburr and clean the flash hole -- just forgot to mention it. I've heard great things about 4198 for the 223. The reason I chose H335 is that I have a muzzle brake put on my Tikka, and I have been told by fairly experienced people that H335 is a slow burning powder and thus the brake is more effective with that powder.

Kory