hit the deer with a 358 win, 250 grain or 350 grain from a 450 marlin caliber rifle
and place it in that (X) you've described and you'll seldom find you have any issues,
yes the 257 roberts and 30/06 BLR work just fine , both are lethal,
but I've personally got a bit more confidence in the heavier projectile and larger caliber options.
with potential tracking, or deer running more than a few steps,
the more I hunt with the 358 win and 450 marlin chambered BLR carbines the more impressed Ive become
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I sight all my rifles in to impact 3.5" higher than the cross hair in the scope indicates at 100 yards
this allows a very easy no calculations required hold,
for consistent shot placement, in the first 150- 200 yards where an easy 75-80%,
of all the deer and elk Ive shot for decades are shot at

Last edited by 340mag; 05/16/19.