I sort by +/-0.001 thou. Once you find the mean of the lot of bullets you have, if they are good quality, most often 80-90% of them will fall within this range. The reason I will reserve for fouling shots.
I have found it interesting that the more extreme a chambering is, the more baring surface will show up down range. WHen I was shooting the 200 gr ULD RBBT Wildcat bullet in my 7mm AM loaded to just under 3300 fps.
At 500 yards, there was no real difference in impact no matter what the baring surface variation was, within reason.
At 1/2 mile you could start to see the effects of it if bullets were not sorted by BSL. At 1000 yards, you could cut groups by 1/2 moa by shooting sorted bullets. At 1500 yards, it could be easily 1 moa veritical stringing.
That said, in a 270 Allen Xpress(300 Dakota) and the 169.5 gr ULD RBBT, there was not nearly as noticable stringing, even with same BSL variation........
This brings me to the following conclusions:
A. The shorter the baring surface length, the less effect this variation will have down range.
B. The lower the expansion ratio of a given cartridge, the more baring surface variation will effect down range stringing.
Now this certainly may not be the case in every situation but its repeated itself enough to make me believe it.
Simply put, sorting by BSL is easy to do, why not do it just because.
Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.
I have both the Buhay unit and the two stoney point set-up. they both have their advantages.
The two stoney point OAL checkers on a dial caliper is way faster and way less expensive, the downside is that if you think you are sorting by .001" you are kidding yourself. in reality it might be as good as .002"-.003"
The Buhay unit is slower and much more expensive but is capable of sorting to .001"
In most cases .002"-.003" is good enough and the stoney point set-up is a good place to start you can up-grade later if needed.
It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.