I have a remington 5 r in .223 and every review says 69 gr smk are the best.Well I have tried 53,55,62,69,75,77 grain bullets and so far the only 2 thats will shoot under 1 inch are the 53 grain hornady superformance (.860) and the 77 grain smk black hills and federal shooting (.600) I just cant seem to find a happy medium between 53 to 77 and it is really hard trying to find a bullet to start reloading.Every test has been done with factory ammo and 2 different 77 smk brands performed great.
69 smk federal
77 smk federal
53 v-max superformance
All were fired from 100 yards 5 shot groups
All were fired from 100 yards 5 shot groups