That's how I do it, I read about it a while ago and it made sense to me.
Now a days it wouldnt make a big difference to me but I was loading for Fclass before and round counts down the barrel change groups and when all groups are pretty dang good anyways I think it gives the fairest showing of all charges to be shot through the whole barrel temperature range instead of starting with a cold barrel and light load and finishing with a hot barrel and hot load, or vise versa if you like excitment.
