Lot to lot variations is the ONLY reason for the differences seen from lately manufactured powder, um, period.
Here is a test you can do to see if that is true or not. Go 40 miles away from where you usually buy your powder. Or 100 for that matter, buy a can of the same kind of powder as you now use ONLY make sure you get a different lot. There is a number on the can, don't buy one that has the same one!
Then, load them side by side, through the same press, same weights, same bullets, same primers same everything except lots of powder, go to the range and shoot them like you always do, because that is all that will ever matter to any of us, how WE shoot OUR loads, and take your data the same way. Make careful notes, take some pictures, share.
Simple, and I would like to know how things work out for you. Oh, make sure you have a chronograph too. That would be useful information as well!
Take pictures of the case heads and primers, that is always good to look at.
This is not a satirical post either. Do it and let's see the report.
Do one for W296 and one for H110, that would be interesting as well. Different lots then compared to each other.
I think I am talking myself into something I don't have time for! I will resist, you do it!
