thanks for that greg. you've answered most of what i was looking for regarding the process of bumping back in an instance like this.
one thing i think i may have worded poorly however i'd like to clarify where my concern fell.
Originally Posted By: GLShooter
Seating depth WILL NOT be affect. COL will be but not the bullet seating depth. A 0.010 shoulder push back, taken as an average, will show zero in our performance in this platform. You will see as much as 5% variation in case capacity just by using one brand of brass over another and at times even in the same lot of normal run brass you might see that in the same lot.
while i understand that bumping the shoulder will not change where in the neck the bullet is seated, i was referring to in relation to a round loaded in brass of the correct dimensions.
ie: if the shoulder is 0.010 long (average) to begin with, and the round is loaded to 2.060 COAL, when you move the shoulder back would that not be the same as loading the same bullet into a normal case to 2.050 COAL? therefor to my thinking that round would have a relative 0.010 average difference in seating depth even though the process we're using to correct the shoulder doesnt actual alter the current placement of said bullet at all.
i was also wondering while driving around yesterday afternoon that there may be a trim length issue with this brass once it gets the shoulder bump applied - that it would end up short by whatever the shoulder bump is? i dont think that it'll end up as unsafe as SAAMI spec is of trim length is usually max length -0.020 and for most stuff recommended trim length is max - 0.010
so even on the worst side of things the brass will only be under min spec by a couple thousandths... which should work itself out for the most part after firing and the following FL resizing.
just something to consider with this brass going forward, especailly if the OP is applying any kind of crimp with their loads.
if there's gotta be an upside - i would speculate these cases shouldn't need to be trimmed for a firing or two.