I dont.....cause my mate made me some .223 loads at 24.5grns of 2206h 25 years ago and my rifle poked them into group smaller than an inch..so thats what I duplicated for 20 years...and used same charge with 50grn too... only in last 5 years when loading some barnes have I tweaked powder charge up a little...its accurate and it kills ,my brass lasts well so I leave things alone.
Ive been lucky in that I can throw a mixture of loads through rifle and they will still group together... makes life really easy.... think about your end game,how accurate do you really need??? unless your headshooting bunnies at 250 yards you can get by with much less than thumbnail size grouping.... by going inch or below it does anything I want out to 200 yards with ease.
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