It's called finding the right load.
What I've always been told on my side by side front end stuffers. Equal volume of shot to powder.
So I started with 50/50 and adjusted there to either 60/40 powder to shot ( which at times can blow holes in patterns) to 45/55.
And it all changes with wad thickness and/or the use of a shot cup.
Once you find consistent load and I mean every load don't fiddle with it.
And then add a 2nd barrel sitting right next door. And you start all over again as with all my side by sides.

Ive spent hours/days developing loads for what I own. In 2020 shot turkeys with all 3. Even flat out missed too.
Head scratcher on that one.

JW