.357 xtp rounds

[.356luger]

I started hand loading several years ago and have maxed out several rounds for multiple guns and the old adage stands more isnt always better. and i recently purchased a rossi 92 src (pre safety) in .357 for my deer hunting needs rough little action till i put a gun slinger spring kit in it to calm and smooth ejection. Now to the reasoni started this thread i also have a ruger gp100 with 6 in barrel and with a full house 158 grain xtp loaded with accurate no.9 it is super hard hitting little round, but with the 20 inch barrel i am gaining approx 350 fps and my xtps are exploading on impact with a milk jug of water does any one know of a solid coper or partitioned bullet for the .357