varience measureing to ogive ?

[garandman]

@Ned Ludd said...

However, it should be more on the order of +/- .001" or maybe .002", not .009".

And he is right.

 

[rebs]

I believe I found the problem. Operator error not working the press handle in the same way with the same pressure. I took the longer ones and re-seated them without moving the die adjustment and they seated correctly. I seated another batch while paying closer attention to working the press handle and they all seated the same.

 

[JimSC]

I believe I found the problem. Operator error not working the press handle in the same way with the same pressure. I took the longer ones and re-seated them without moving the die adjustment and they seated correctly. I seated another batch while paying closer attention to working the press handle and they all seated the same.

I had exactly the same issue the other day using an arbor press and cured the problem the same way. I went back to my regular press today will only use the arbor wen doing range loading from here on out.

 

[rebs]

I am using a Hornady LNL progressive that I love but I really have to pay attention when loading. Its doing 5 operation at once which is great. But there is a definite need to pay close attention to working the handle.

 

[Dusty Stevens]

And is it just possible that the stem in his die doesn't match the variation in the nose lengths of the bullets the OP is using ? That variation in the nose length may be bottoming out in the stem , on some bullets , causing the seating depth issue .

This is a very common issue. See my first post

 

[McHaggis]

Also the bigger the difference between the ID of the comparator and the ID of the seating stem the more potential the variation

 

[Texas10]

I have found that with my LNL press, the best way to set up a seating die is to have it set so that the press "cams over" against the die as the ram comes fully up. This will ensure that the ram rises to exactly the same position on each up stroke. When that does not cure a seating depth issue, I select another seating stem for a better fit to the bullet being loaded. It does make a difference!

As others have said, neck tension and brass hardness play a role also, so depending upon how you prep your brass prior to loading, whether you anneal or not, or neck size only, will change how your bullets seat.

And of course, a case that is too full of powder will also cause seating depth issues.

I was loading a 69 gr Lapua Scenar over Varget, chambered in a bolt action 223 match that really did not have enough throat for the bullet, and my most accurate charge left no room for adjusting the distance to lands. It was .005 in the lands as anything less caused crunching of the powder charge and seating depth variations.

I reduced the charge by .8 gr and found a lower node that shot as well and eliminated the seating difficulty.