I have several 12" twist 223 Rem's. Two are sub 1/4 moa rifles. One in a Rem 700 with a Douglas match barrel the other is a Weatherby Super Varmint Master with a factory barrel.
I've have extremely good results with Nosler 50 and 55 BT's with 12" twist 223's.
I've have good success with H4895, Benchmark, H335, and Varget with these bullet weights. Currently using H4895 but the others listed worked equally as well for me.
Primers: Exclusively Federal 205M match primers.
With my 8" twist 223's the 60 V max works better for me with groups in the sub 1/2 moa range. However the 55 Nosler BT's are not the far behind with about a grain lower powder charge than my 12" twist rifles.
I've have extremely good results with Nosler 50 and 55 BT's with 12" twist 223's.
I've have good success with H4895, Benchmark, H335, and Varget with these bullet weights. Currently using H4895 but the others listed worked equally as well for me.
Primers: Exclusively Federal 205M match primers.
With my 8" twist 223's the 60 V max works better for me with groups in the sub 1/2 moa range. However the 55 Nosler BT's are not the far behind with about a grain lower powder charge than my 12" twist rifles.