Heavy bullets for that caliber

I have used a few heavy for caliber projectiles.

I've tried 200 gr in 38spl and 357 Mag. I didn't really see anything make me keep doing it, so I stopped.
I do regularly shoot 185gr lead in 357 Mag, it's a big meplat round flatnose.

I have an NEF rifle in 357 Mag that will chamber the 360DW brass easily, I plan to play with those 200gr in 360DW in that rifle.

In 44 Mag I've gone no heavier than 310gr. I see no reason to go heavier, the 310gr will kill anything I'm likely to shoot at. Probably pass completely through end-to-end, at that.

Sorry, I have not. I'm not a fan of heavy bullets. I also do not like light bullet either. I use the bullet weight which was used to develop the ammo. (158/160gr 38/357, 124/125gr 9mm)

I'm sure there are used for heavy for caliber bullets but I find wisdom in the creators like John Browing.

I don't think you'll be able to get a 320 grain 44 special to 750 fps. It would just require too much pressure . if you try it had better be in a robust revolver, I think however you'll run out of room for powder.

357 RUGER BH 6 5/8 barrel
I like heavy for caliber, but heavy for caliber will reduce case capacity. So it’s somewhat of a trade off somewhere down the line. Good thing about BH is 1.710 available chamber length and I use most of it!
I use them for hunting mostly, but the heaviest I have tested is 172 gr Kieth LSWC. That is WHEN I get time to hunt!
But I AM looking at the 180+ WFN as we speak. That flat nose is the ticket! I call them Flying Trash Cans!
For Target, I use 158 LSWC.

Maybe no correlation here, but I usually run 115 gr Lead in my Tokarev.
Pretty dang accurate & flies at 1300+fps.
(I run 'em mainly cuz that's what I could get during the last obamanation scare.

Although I should go back to 85gr & run 'em a bit slower.
My load's pretty hard on the gun.