Model 12 savage in 223 rem.

[jinx-)]

having 1:9 twist you should try 69 gr bullets

Why? It will shoot the lighter bullets just fine. In fact for short range work, the flat-base bullets are usually more accurate regardless of twist.

My 12FV in .223 hated every factory round I've fed it, but handloads from 50gn-75gn shot well.

sure go for it try some 35 grains why not