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...