To Mudcat, I think your seating depth is wrong. Try 5, 3 shot groups starting on the lands and working back in 25thou increments untill you run out of bullet. In my opinion changes less than 25 thou are a waste of components. Don't change your powder charge, select one a little under max that gives you the velocity you want. Varget is a good powder and for best results in a 223 I would use Remington 7 1/2 primers and Lapua brass. If the flyers persist, try a different scope and last of all have your rifle rebedded. Hope this helps as flyers can be very annoying. One last word of advice always do load development under the very best of conditions that is very early in the morning or last thing in the afternoon when wind is less. Regards Murphy.