I don't have any problem with the 240 or 300 XTP MAG Hornady bullets. They group well over a wide range of loads and powders.
I use H110 typically with the 240 XTP MAG but have used A9, 2400, N110, and LilGun with good result.
I use IMR4227 with the 300 XTP MAG for the past several years with my hunting load. Good results also with the same group of powders mentioned above.
Note the regular XTP are not rate for the velocities achievable with the 460. I had several jacket separation with the 250 XTP before I did a little research. I would only use them with Trailboss now.
I have also used Barnes and Cutting Edge bullets also with no problems while hunting.
I have shoot the 300 Speer and Swift bullets on paper and they behave just like the Hornady XTP MAGs. I suspect terminal performance would be similar.
I only used the FTX 200 Hornady bullet on 1 pig and will not use them again on game animals. Opened way to fast and fragmented, ruined a lot of meat. To top it off it was out of my 5" - would of been worse out of a longer barrel. Know others whom have had same experience.
All the areas I hunt require expanding bullets so I cannot comment on terminal performance on lead. I have tested several different weight HC gas checked bullets from Matts Bullet and they also group well from my guns except my 10.5" were I think they need to be sized a little smaller (tighter throat). I hope to actual try these in Alaska this fall- going to use the 355 with 65% meplat.
Which 460 do you have?
What distance you shooting?
What Hornady bullet was he reloading for you?
Good luck and be safe
Ruggy
Going to use the 300 XTP MAG tomorrow morning on pig - if I can find them, last outing below (240 Cutting Edge bullet on H110)