This a common thing. I do like Hornady. My very first round I loaded was a 150 GT 270 Hornady spire point. Shot lots of deer and coyotes until I had enough money to buy a 22-250. Now I usually only use their V max on
varmints. I have progressed to Partitiions and finally settled on Barnes for hunting.
Long range requires different parameters.
My closed pal I shoot F Class with thought he would try these out. He bought 1000 from the same lot and weighed each bullet. They varied plus or minus 3 grains. He proceeded to separate them in 1 grain increments and only shot them that way. When he was done with the 1000 bullets he went back to Berger.
Now my experience is similar with Lapua 155 GT scenars regarding ogive differences. They are all +/- 1 grain weight wise. My first 5000 from the same lot shot great. When they were done I ordered 5000 more. I did not change seating depth on the forester seating die and they shot terrible. I got out my comparator and the difference was drastic. I tuned the load and then successfully shot those off. Last year I had to order another 5000 be the first thing I did is used the comparator. Again this lot was different. I went to the range to test knowing this. After a bit of tuning, they would shoot well too.
All this goes to show that tooling changes, tools wear and even the best manufactures can have variations between lots.
I liked the comment by someone in this thread who suggested buying enough of one lot to last the barrel.
Also all manufacturers have improved their quality over my 40+ years of loading.
Good luck and keep experimenting. That is one of the most enjoyable parts of our great hobby.