What powder for 223 rem

Bit of a Necro, i use N133 for everything from 55 - 77 Grains. its very Economic with heavier bullets and i get amazing consistency and spread with

75 Grain PPU HPBT.
21.8 Grains, 2600 FPS out of an 16" Barrel

Had 55 Grains up to 24 Grains, they werent chronoed but they were supposed to be screaming out at about 3200 fps in a 24 inch barrel.
 
Opening paragraphs on N133 from Vhit website

VIHTAVUORI N133,​

Originally developed for 5.56 Nato cartridge, Vihtavuori’s N133 is a multipurpose rifle powder for centerfire .22 cartridges and PPC caliber cartridges.

N133 is a tubular powder with grain dimensions of 1,1 mm length and 0,8 mm diameter. The burn rate is medium in the scale of our rifle powders, and it works like a charm with .223 Remington,
 
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