Not so sure the 6.5-284 can be considered a wildcat cartridge at this point as many maufactures are chambering for this cartridge. Having said this, what are you loading for this cartridge configuration. I am currently loading 48 gr. of IMR4350 atop a 107SMK for bbl. break in. My 284 Win. brass has been necked down to .264, neck turned, flash hole deburre, necks chamfered and primer pockets uniformed. When the weather cooperates I will get to the range to start my bbl. break in. Hope the weather is warmer where you all are. MTG