I am not a 1000 yard shooter, and.....I don't shoot enough so do not have the need to purchase powder 8 pounds at a time; more like a 300 yard shooter. I have been reloading for many years and I do strive for the best groups that I can develop from all of the cartridges that I shoot; and...usually will do just that. I reload for a .270 AI, do not get the 3 shot groups that you have photos on due to the lighter barrel, but will consistently get two shot overlaps at 300 yards (Alliant Reloader 19); and I don't take lot numbers into consideration when I purchase powder because today I am glad to find it! I go from one pound can to one pound can of powder, lot numbers have been all over the place, never issues with this process. Especially with the shortages of components today, unless the purchase is like 24 pounds at a time so the same lot numbers can be had, I think it is almost impossible/unrealistic to try to keep the load/powders with the same lot number. If I were you I would mix the powders and enjoy the shoot on Saturday. Perhaps some day I may be recanting this posting, however presently this is my position on lot numbers or mixing powders; good luck with your shoot.I have a 1100 grains of H1000 in one can, and 3400 grains in another. Which will load roughly 60 shells at 72.5g from my 7-300 win mag. I need to load a batch of 50 shells up. What say you about putting it in a bowl and mixing it all together? Yay or nay? I worked up a super accurate load with the one can that had little over 1/2#...I have a 1000 yard shoot saturday and need to load up 50 shells, so that lies my dilemma. I am going to hit the range at least once, if not twice to see what it's going to do before I head out saturday to the 1K shoot. I need to start buying 8# kegs of this $hitt...I realize I'll probably have to fine tune a couple few tenths of a grain here or there, that's why I'm going to hit the range a couple times before I head out. Just wanted to hear some of your guys thoughts anyway.