Diffence in shoulder length?

[timberelk]

While using a Hornady shoulder measuring tool and testing 7 once fired brass (tested each piece several times) that came from my chamber they ranged from .626-.629". If I'm only suppose to bump the should back .002-.003, what measurement should I use?

I also measured one new Hornady brass and it was at .625"

 

[dok7mm]

It often takes a couple of firings to get a consistent base to datum length.

 

[trumperman]

Tagging in on this.

 

[bigedp51]

After firing the brass springs back from the chamber walls and softer brass springs back less.
I would bump the shoulder back to between .628 to .627 and see how the case feels when chambered. You can use a black felt tip marker and color the base and shoulder and check for rub marks.

 

[timberelk]

After firing the brass springs back from the chamber walls and softer brass springs back less.
I would bump the shoulder back to between .628 to .627 and see how the case feels when chambered. You can use a black felt tip marker and color the base and shoulder and check for rub marks.

You're saying to use a sharpie and color the shoulder edge and chamber once fired brass (don't size it through a die) and see what brass contacts the chamber and removes the sharpie? My guess would be the .629" ones will and the shorter ones won't?

 

[Mikecr]

Stop guessing.
Take your cases to fully fire formed(a new 'longest'), as indicated by resistive bolt turn(w/firing pin spring removed). Then set your die to bump(actual) a thou at a time until shoulders clear. Log your measure of it for future repeating.
Don't ever trust a die to hit that measure, always verify it, as cases change over cycles in their accepting of bumping.

 

[timberelk]

Stop guessing.
Take your cases to fully fire formed(a new 'longest'), as indicated by resistive bolt turn(w/firing pin spring removed). Then set your die to bump(actual) a thou at a time until shoulders clear. Log your measure of it for future repeating.
Don't ever trust a die to hit that measure, always verify it, as cases change over cycles in their accepting of bumping.

Thank you for the recommendation. I did a similar thing (removed the firing pin) but the ejector/extractor still applies pressure to the case and gives me a false reading of pressure. I took once fired brass and it gave me a restrictive bolt **** and it is because the little plunger on the bolt is pushing it in the chamber

I've asked on here for advice to removed the extractor/ejector and have searched for hours on the internet and can't seem to find how to remove the ejector/extractor. It is a howa 1500 bolt/action

 

[Mikecr]

Take a small punch and tap the ejector retaining pin out. No need to mess with the extractor.

 

[timberelk]

Take a small punch and tap the ejector retaining pin out. No need to mess with the extractor.
View attachment 90323

Thank you! The plunger and a spring will come out correct? Is assembly difficult or do you just line up holes?

 

[timberelk]

I believe I found a YouTube video! It is for a savage but I believe it is very similar to the howa 1500 ejector