I bought a used Rem 700 SPS in .223 Rem. Unfortunately it has a 12 twist barrel. Put it in a KRG bravo chassis and added a KRG SV bolt handle. KRG branded 10 round AICS mags. I tried several bullets in the 52 - 62 grain range with 4 different powders including Varget, 8208, BLc2 and H335. Using Lapua brass and BR4 primers. Didn't get very good data or groupings from anything. It seems .223 barrels are tough to come by right now... I found this https://www.bulletcentral.com/produ...-cal-b11-medium-palma-7-75-twist-31-blank-5r/ and think it is placed in the wrong category. They have it listed as a .22 blank. I called Bullet Central and the guy seemed to think I was right. Any input on whether this barrel is the correct one for use with .223 Rem? I went ahead and ordered it. My intention is to use it as a trainer on our 600 yard range. Will chamber in .223 Wylde. I hope to use 68 gr BTHP's as I have a bunch and a good load worked up for an AR using them. Do any of the polymer mags feed well in .223 bolt guns? Would truing the action be worthwhile? I am just hoping for sub MOA at this point. Wasted a bunch of bullets and powder trying to make it work. Time to move on.