Velocity ES

[paul o']

Easy way to help you is : -https://www.gunsandammo.com/editorial/long-range-shooting-understanding-extreme-spread-and-standard-deviation/247510

 

[Selous]

There is a pretty strong consensus now that this is a pointless exercise.

If you are 'uniforming' the primer pocket, where is your reference/datum line?

The extraction groove/rim or case head?

Even then, commericial tools that advertise this feature and actually cut into the pockets are not consistent enough.

I'd listen to Primal Rights regarding this, as he has developed tools to measure such variances and says just start out with good (Lapua, ADG, Alpha Munitions) brass.





'Improving' in such a way = ruined!

Plus weight sorting ≠ differentiating based on internal volume.

Haven’t come across those, thanks for the heads up

 

[User00040]

Haven’t come across those, thanks for the heads up

No worries, his techniques are beyond my skills (and budget! ) but he does have evidence to back his claims up and puts his money where his mouth is!

 

[Sharpie]

If you want to reduce it you could try changing charge weight slightly (both up and down) as you may not have identified the centre of the velocity node, and try a different primer. Otherwise anneal your cases, trim to length and smear a touch of imperial wax on a Q tip inside the case neck before bullet seating. It wouldn’t hurt (much) to measure your case neck thickness, uniform if necessary and deburr flash holes and cut the primer pockets to a uniform dimension. Then you just need to weight sort them! What make of brass are you using?

Ha haah, quite a windup. You didn't mention maybe trying them at say 200 yards/metres or more. 100 metres, to me, is a very short distance. Which I would have done. Oh dear. Though another has jumped in with the usual "Lee dies are cr@p), buy a better one" nonsense.

The effect of ES on vertical is easily simulated with any online calculator or app. At hunting ranges it is of almost no significance, in these magnitudes.

Measure less, shoot more. Unless you also want to compete in target shooting at distant paper targets.