Hey Mike,
Are using ADI powder in your 223 loads? What twist is your barrel?
I have been really struggling to get decent accuracy out of my Rem LVSF (1 in 12 twist) with either the 53gr TSX or the 60gr partition. Expected as much with the partition as the twist is on the slow side but don't know what the deal is with the TSX - have tried both AR2206H and AR2208 with little success. Keen to try the heavier Sierra's that you're using.
The rifle is a bug-holer with 52gr BTHP, 55gr Vmax etc.
Cheers.
