I’ve been using it for a couple of years and I’ve never seen this. Either only thing I can think of is, I opened a new bottle, but the lot was the same. Maybe I did something that I didn’t know that I did but that’s pretty rough to deal with 75 feet a second when it’s already slow at 2525 of course it’s a 16 inch barrel but still I can’t handle 2450 that’s just way slow.
I shot it again yesterday and it was almost identical but while I was there, I had some loaded with H 4350 started at 37 grains because my chambers tight and ran all the way to 40 gr and in half gr increments. I was getting close on pressure at 40 grains, but it did throw a group of three at 2550 with an SD of 10 At 40gr of H4350. I think there’s still some more meat on the bone so I loaded up some more with 40.5 and 41.0. I’m gonna try today. I still have a few of the others that showed the original issue. I’m gonna shoot them again today as well. I to mix all my bottles together. When I buy em mainly because there’s so much room in those reloader bottles, you can easily put 2 pounds in one of them. I’ve got a 8 pound jug of 16 that’s never been opened. I might get a few out of it and see if it’s doing the same thing.When you think about it’s only 51 mph
But on a serious note it could just the relative humidity of the powder.
When I have multiple 1lb bottles of the same lot I usually combine them into one container to avoid unwanted issues. 75 fps is still quite a lot for just changing bottles.
I’d run the test again and see if you can duplicate it. If so bump the charge up until you are back at your 2525.
