Neck Trimming ?

[wkdickinson]

OK, I've been reloading and competing (various disciplines) for a long time. I totally get neck trimming to make sure your case isn't to long for the chamber. But for "accuracy" does having a consistent neck length really matter? If so, how much difference is too much and why?

 

[60723]

Inconsistent neck length means inconsistent neck tension. Probably means higher ES. Depends on how much vertical you can accept.

 

[Bill Norris]

OK, I've been reloading and competing (various disciplines) for a long time. I totally get neck trimming to make sure your case isn't to long for the chamber. But for "accuracy" does having a consistent neck length really matter? If so, how much difference is too much and why?

He did not mention accuracy but in a podcast "Believe the Target" with Erik Cortina Lou Murdica said with pressure testing in the tunnel he saw differences with only a few thousandths of neck length.

 

[SeabeeKen]

Another issue i watch for, if one side of the neck is longer than the other, the bullet can still be touching one side while the other is unsupported upon bullet exit. This can be seen after fireforming new shoulders etc. i trim enough to keep them squared up when necessary

 

[Straightshooter1]

Inconsistent neck length means inconsistent neck tension. Probably means higher ES. Depends on how much vertical you can accept.

In addition to that neck tension, there'll be a difference in the timing for the blow by effecting pressures.