I'm on a oal mission!!!!!!

[hot range]

In the past I have struggled to get results that I'm happy with as far as neck tension inconsistencys or any other thing that can cause variances in my oal measuring from base to ogive. I got sick of measuring every round after I seated the bullets so I came up with a scientific approach to test my different ideas I had to improve my issues these would include different annealing run times, dirty case neck, lubing bullets with dry lube, neck turning, measuring bullets, more could be mentioned if I thought about it longer.
As far is my method to test what methods are yielding the best results I came up with a plan. I will reload in lots of 50 rounds, I will set my seating die for my first round and won't touch it untill all the bullets are seated. Then I will measure every one from base to ogive and will figure out the average, standard deviation, and extreme spread for each lot. This should give me a good idea what things work for me.
This project has just started I am using Forster seating dies and a redding turret press.
I will post results as I get them and anybody else that feels to can measure a lot of your ammo and put the results up for us all to view.

 

[hot range]

First batch actually surprise me!!! Might be my new benchsource annealer making the difference!!!

6mm br
Nosler brass
Berger 87 gr vld


My target length was 1.805
7 - 1.803
19 - 1.804
19 - 1.805
5 - 1.806
Sd - .00086
Es - .003
Average - 1.8044

 

[hot range]

It would be very interesting to see some people that are professionals lol, put up results to see how good the standard should be.

 

[BoydAllen]

This might relate to what you are trying to do....or not. Tonight I made up a dummy round for my new 6BRA barrel using a fire formed case, that I had bumped the shoulder back .001 from a tight bolt close. (The fire forming chamber was in an old barrel done purposely long on headspace so that cases could be sized to a close fit after fire forming.) Anyway, I sized the neck with a collet die (The newly discontinued 6PPC die works fine.) and then body sized with a cut off Harrell's dasher die with no bushing. The seating was done with a Forster micrometer seater that was built for a Dasher that has had its sliding sleeve cut off .090 so that the case and not the shell holder pushes the sleeve up as the bullet is being seated. I used a "gizzy" squared off barrel stub with the front of the chamber cut into it) to set the die to seat .001 longer than touch. The bullet was a 95gr. VLD that I had sitting around. After seating the bullet, I got out my old Sinclair concentricity gauge and set it up with the indicator touching the bullet where the ogive met the shank, about .150 in front of the case mouth. Turning the case carefully, taking the reading several times to be sure, the total runout was a little over half of a thousandth. Mission accomplished.

 

[hot range]

This might relate to what you are trying to do....or not. Tonight I made up a dummy round for my new 6BRA barrel using a fire formed case, that I had bumped the shoulder back .001 from a tight bolt close. (The fire forming chamber was in an old barrel done purposely long on headspace so that cases could be sized to a close fit after fire forming.) Anyway, I sized the neck with a collet die (The newly discontinued 6PPC die works fine.) and then body sized with a cut off Harrell's dasher die with no bushing. The seating was done with a Forster micrometer seater that was built for a Dasher that has had its sliding sleeve cut off .090 so that the case and not the shell holder pushes the sleeve up as the bullet is being seated. I used a "gizzy" squared off barrel stub with the front of the chamber cut into it) to set the die to seat .001 longer than touch. The bullet was a 95gr. VLD that I had sitting around. After seating the bullet, I got out my old Sinclair concentricity gauge and set it up with the indicator touching the bullet where the ogive met the shank, about .150 in front of the case mouth. Turning the case carefully, taking the reading several times to be sure, the total runout was a little over half of a thousandth. Mission accomplished.

My title might be giving off the wrong idea but I was thinking more in the over all length area from base to ogive. But that was very interesting the steps you took to achieve those results. What I guy don't do to achieve every ounce of performance.
I'll change my title

 

[BoydAllen]

Your title is fine. I got up earlier than usual this morning and the process is less than perfect. If the sliding sleeve of your seater is touching the shell holder, trim it until it does not. and the case pushes it. Your can lower your seating body until the shell holder contacts it and toggles very slightly. This will make the stretch or compression of the press linkage be more uniform. Let me know how these steps work for you. Do the second one first.