Use 405Grn from bulletbarn
http://www.thebulletbarn.com/
I have shot the 405grn tripple and single lube gas checks for years and years about 5 years ago i bought like 600 from them lol.
Such great bullets to shoot.
The gas checks worked much better then non gas checks fyi. looks like they have differnt grain choices now too. 525 / 390 / 405 / 450 and even 350's now.
These are hard casts and will not deform on impact with practically anything.
You can shoot through a 3 foot tree block with it and the exit hole will be 45 Caliber heh.
good rounds and very accurate and consistent.
Those new 390 grn Gas Checks look good to me.