Been using 1/2 gr. increments for years, and will continue to do so. I tried the 1 gr. inc. deal once, and then went back to the 1/2 gr. loads, and guess what!! A 1/2 gr. inc. load was the one that shot best with consistency. I felt I may be missing something at a full grain increment, and was right. The full grain loads on either side shot fair, but it was that "one in the middle" that I'd been searching for.
Do what you want, and good luck. Just wanted to pass on some of my experience, for what it's worth..................