My buddy has a Whelen and I have a x62. I've killed with mine and he has yet to. Up to DG they are likely equal but the x62 probably ly off err s better penetration unless super heavies are used and then they probably even up again. The 286 vs 250 but the 320 and 310s probably compare favorably. I think the 9.3 250s may fly a little bett et at long distances. Who knows though I dont shoot far.
I like the 286 NP as a standard at 2450.
