Velocity junkies unite.
This reminds me of a guy I used to see at our range. I did not know his real name but everyone called him "Magnum Matt".
I was shooting a lot of rifle in those days and had some 22-250's that would shoot 1/2" at 200 yds if I did my part. Magnum Matt always was shooting 220 Swifts and laughed at my rifles. Matt did not care if he could hit a refrigerator at 50 feet as long as the bullet got there fast.
I was watching him shoot one of his Swifts one day with some of his super hot 40 grain loads. On about half the shots, the lead core was melting out of the bullet as it flew and left a smoke trail similar to the contrails airplanes leave. Magnum Matt was pleased as punch.
Later I was talking to my Gunsmith who knew Matt and he told me some other stories. Matt loaded up some super hot loads to go prairie dog shooting. He gets up to South Dakota and it was about 105 degrees out. The first afternoon a case rupters and blows the mag well out of his rifle, so he has to come home.
My Gunsmith also told me he stretched the frame on a K frame Smith with his 357 hand loads and ruined it. Neither I or my Gunsmith had ever heard of that being done.
Magnum Matt, a true Velocity Junkie.