spaniel
Just had another thought... that new X7 might have one of the real tight TC bores and if so it might be really tough to get the .458/Orange sabot down the barrel... If so not all is lost got to the .451 Nosler and a HPH-3p-EZ load sabot or even maybe the "crush rib"
What sabot bullet combination are you using now? That would tell me a lot about your bore...