That would be up to you, most 223 Handi owners load to SAAMI recommended COLs, Barnes recommends .050" off the lands with all of their X-bullets, and doesn't list COLs for any of their loads, that doesn't help much in the deep throated H&R .223 barrels, there's no reaching the lands until you get up in the 70+gr bullets for the most part, which don't shoot in the 1:12" barrels, and most 1:9" barrels don't do well with them either. :-\
Tim