Remington 700 26" 1/12 twist .223:
25.0 gr Benchmark
CCI 400
Hornady 55 gr VMAX
2.255 OAL
LC Brass
3,207 fps

Tikka T3 22.5" 1/10 twist .223:
26.4 gr Benchmark (26.4-26.5 gr is a well known load with 50gr slugs. Work up to this as it's a max load)
CCI 400
Sierra 50 gr Blitzking
2.255 OAL
LC Brass
3,344 fps