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The last lot of Remington UMC I shot through my chronograph showed 3110-3125 fps from a 20" barreled AR. To duplicate similiar velocity with H335 powder you'd need in the range of 24.6 to 25 grains. Start just a little lower in the 24 grain range and work up to the above charges. The most often said accurate 55 fmj bullet is the Hornady 55 fmj. Use a recommended primer for semi-automatic rifles. Don't use RP 6 1/2 primers in .223 loads. I use RP 7 1/2 primers in .223 loading with the above charges. Overall lengths using 55 fmj bullets range from 2.200 up to a maximum oal of 2.250". It depends on which bullet you use. Some are long sharp pointed and 2.250" would be correct while others have blunter rounded tips and they usually end up from 2.200-2.230". It's sometimes hard to duplicate factory load accuracy but experimenting can duplicate or better factory load accuracy. H335 is the perfect powder for 55 grain .223 loads. I seat Hornady 55 fmj's at 2.220" oal and they work in my AR's from 2.215 to 2.230".
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