Good load for 223 with 1:7 twist?
Just wondering if anyone has a favorite load for long range accuracy for the 223 with 1:7 twist. I worked up a load with Hornady 75BTHP and 26gns of BLC2 and went to the range today and tried it but I can't get it to group better than about 1.75 MOA. I'm shooting them from a White Oak Varmint upper which should be very accurate. I'm currently using Magtech primers as they are all I could find at the time and I think this might be part of the problem. Anyone else tested these and if so what were your results. I want to eliminate them from the load but I'll have to find some other small rifle primers first and we all know that can be a problem right now.
I checked the scope and the rings just to be sure and all is tight. Scope is brand new and I don't think it is a problem. I don't think I'm the problem either as I can usually easily shoot sub MOA as long as the rifle is accurate and I was really concentrating hard today but just couldn't make it group. I've got some Varget on hand so if anyone has a pet load developed with it and heavier bullets please share.