Ed's gun shop has been selling these for awhile now, Carlos did a Video of the XP's and the 300 gr .458 subsonic CF.

XP'S 250 GR. .452----- ( USE HARVESTER SHORT BLACK EASY LOAD SABOT)

305 GR. .458 CF'S----- ( THREE PETAL) (USED THE ORANGE SABOT ITEM NUMBER 0457-.458)

300 GR. .458 SUBSONIC CF'S---- ( FOUR PETAL) (USES THE SAME SABOT AS ABOVE)

Have been testing the XP's sabotless, out of my 45 cal Kodiak, and they have been very accurate.
Carlos also took a deer with the XP bullet out of his SML rifle.

Dave