A double charge would be catastrophic.
When I was around 12, I took a pair of pliers and pulled the bullet out of a Remington .22 LR case. I noticed it was only around two thirds full of powder.
Feeling that Remington had short changed me, I pulled a couple more and dumped enough in one to fill it. I must have been a little suspicious because I used my Brothers Remington model 513 which had dual rear locking lugs instead of my model 514 which just had the bolt handle locking it.
When I fired it, there was no hole in the board I had it pointed at, just smoke everywhere. I had to beat the bolt open and there was no case in the chamber. I have no idea what happened to it or the bullet. I did find tiny pieces of brass throughout the bolt etc. It must have literally turned the shell and bullet into gas. I still don’t know for sure what happened.
Incredibly the old Remington was undamaged. This was not a double charge but about a charge and a half.
You disintegrated the bullet.
Wait until the old boy beside you touches of a 300 Weatherby that had about 10 grains of 2400 under a full load of 4350. Even the Weatherby action couldn’t keep that bolt in. It was ugly, check your equipment folk’s!