The good news is that you have three components that make getting accurate reloads easy; H335, A gun in 223 Rem, and a good weight bullet. All that's missing is that scale! Last year I had a very interesting experience with max loads and H335. A few years ago I bought a heavy barrel 223 that shot incredible groups with charges more on the min than max side. Last year I picked up a light 223 CZ rifle for a coyote and walking varmiter rifle. 1.5" 5 shot groups with everything but a close to max load (27.0g H335, depends on what manual you look into regarding max). That hot load gives me group sizes from .27" to .75" for 5 shot groups. I don't understand it, but I'm glad I kept testing!