I have played with 500 grain paper patched bullets in my 458. They shoot very well with full power loads. If I decide to reload for my 505 I will get Hoch to make me an adjustable weight mold for paper patch in that caliber. I don't know if they will hold up to the speed of the 505 in it's normal weight. If not I'll jump the weight to 600 grains, as I already know the bullet can stand that speed.