I also weight each and every load...I have never found a powder measure I trusted enough not to weight each load...and I know how you feel, last summer I loaded 7500 rounds of .223 over a 3 month period.

I use Win 748 as my primary primary powder for my .223...but I don't load anything that light. All my .223 rounds are 50g Nosler Ballistic Tips (the varmint ones)...for this load I use 25.5g of W748 with Remington 7 1/2 primers.