Loading heavier bullets in .223

[Tony k]

So far I've tried IMR4064, WIN748, and H335 with Sierra Game 65gr.

Bushmaster AR carbine with 1:9 twist

4064 22.9grains=1.5" five shot group bolt failed fully cycle on every shot
4064 23.9grains= 1.25" five shot group
4064 24.7grains=1" five shot group

748 24.3 grains= 1.5" five shot group
748 25.1 grains=1.5" five shot group
748 25.7 grains=1.5" five shot group

H335 24.4 grain=1.25" five shot group
H335 24.8 grains=0.75" five shot group
H335 25.2 grains= 1.75" five shot group
H335 25.6 grains= 2.25" five shot group

With this gun, I'm suspicous of anything better than 1.25" groups. Five shots is not exactly conclusive, but take it for what it's worth.

 

[joustin]

I've read that with a reduced charge the 75gr AMAX can be loaded to mag length. It looks weird with part of the ogive below the case neck. The range reports were very good and the load was compressed the potential loss of neck tension / surface area seemed to be negated. The guy that got the info said the person ran 500 or so through a match and scored very well. I am not sure of the load data as I am not really willing to try it lol

 

[Walkalong]

Well, it shot the Hornady 52 gr HPBT Match bullet great, and I haven't tweaked it yet, and it shot the 55 Gr V Max really well with no tweaking yet. (H322)

I haven't loaded the 68 Gr SMKs yet, and have failed to get any 75s or 77s yet. Maybe I'll get a chance to shoot some 68s today, but work just called, and so it won't be first thing for sure.