Re: 6.5 ulta mag
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I suspect their BC from bullet drop will be in the .85 to .875 range, vastly superior to any 30 cal bullet out there
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By using published BC's, yes. I shoot a Lilja 27.25" 12x in 300 RUM and the 178 AMAX. Published BC is .495 I zero my rifle in at 300 yards (dead zero) and she drops right at 34" in starndard air density at 600 yards. This is rediculously flat. Sure it works out to a BC of .495, on the G7 drag function. If you calculate that with the G1 function, its over 1.000. Oh and did I mention that is at 3100 FPS muzzle velocity?
Unfourtunatly, I dont get the same results with my 308. I dont even get quite the published BC even using the G1 function. It is also unfortunate that this particular bullet is not well suited for big bears or moose or elk. It is a good deer sized critter bullet though.
The point is, sometimes paper ballistics just dont cut the mustard.
Please dont get me wrong, the overall ballistic capabilities of the 6.5 RUM are truly amazing. This is in no way intended to be an agument. Just pointing out some of the natural phenomenons that sometimes occur in this art.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.