I have no idea. I know that this particular batch of ammo was loaded so hot that on multiple occasions the casings swelled so badly that you had to allow them to cool to extract them and in one case the casing split. I took it back and got a refund and that was the only problem I ever had with the rifle. perhaps they loaded the wrong propellant into them or these were just ultra compressed loads. I have no idea.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
I never said half the stuff people said I did-Albert Einstein
You can't believe everything you read on the internet-Benjamin Franklin