trimming ackley improved cases

[RW]

I was wondering if there was a formula for the trim to length on Ackley improved cases? 250 sav imp., 6.5-06 imp. are they the same as the parent case? Thanks, RW

 

[Joe O]

I use a Sinclair case length gage ($7) to determine the length of each chamber, and trim no more than .010-.015 shorter.I don't trim until after the first firing,and find most new brass to be shorter than I plan to trim to,in which case I just square up the mouths,and use any short cases for foulers/sighters.

 

[Bulseyetom]

I find on my Ackley cases they always shorten upon fireforming to the point that they are always shorter than the parent case by quite a bit. I measure them up after fireforming, pick out the shortest or close to the shortest and trim to that length. Tom

 

[RW]

Thank You, I appreciate you taking the time to give you knowledge!
RW

 

[Randfal]

I find on my Ackley cases they always shorten upon fireforming to the point that they are always shorter than the parent case by quite a bit. I measure them up after fireforming, pick out the shortest or close to the shortest and trim to that length. Tom

Plus 1 on that.