establishing TRIM length

[AlbertaAl]

Will give this a try this morning.
They say to use a "fired" case then seat the bullet, hmmm
I'm assuming the fired case wont have enough neck grip to hold a bullet.

http://bulletin.accurateshooter.com/...-length-gauge/

[gzig5]

You're going to need to at least size the neck after it is cut off so it would hold the bullet. The ring should work at fired size with a little squeeze to hold onto the bullet. I make my own plugs like the Sinclair version from brass or aluminum and am very confident in the results. I think you will find that the typical chamber is much longer than the max case length in the reloading books.

[Rick in Oregon]

Originally Posted by gzig5

I think you will find that the typical chamber is much longer than the max case length in the reloading books.

That has been my experience also using the Sinclair chamber gauge set.

[Nor Cal Mikie]

You can try that if you want. And, if you have the proper tools to make a clean cut. I have "Modified Cases" for every round I shoot. IMHO, better than trying to get a machined cut on a brass case. And, trying to hold the case secure without crushing it while trying to tap the case head for the threaded tool rods.
And like what was just said, the actual chamber measurement is longer than the max trim length. Better to measure your chambers, write that measurement down and refer to it when you think you may need to trim.
I've got BR brass with 25 + firings on them that havn't needed trimming. Chambers are usually .020 to .025 longer than trim length. Case length has a lot to do with the type of resizing dies you use too. Full length with the neck button will pull the neck longer with every up stroke. Bushing bump dies work for me.

[redrock ranger]

Sinclair chamber length gauges.

#749-000-811z for 22 cal. Many more available.

They work.

[trelliswires]

http://bulletin.accurateshooter.com/...modified-case/

[AlbertaAl]

Originally Posted by AlbertaAl

Will give this a try this morning.
They say to use a "fired" case then seat the bullet, hmmm
I'm assuming the fired case wont have enough neck grip to hold a bullet.

http://bulletin.accurateshooter.com/...-length-gauge/

Success, after alot of tinkering, got my exact measurement every time after checking it 3X
All my brass had already been resized and awaiting trimming.
I loaded up one of these brass to obtain a fired (expanded) brass
Used a hacksaw to cut the brass neck and used emery cloth to clean up the inside and outside cut areas of any burrs.
Resized the brass and seated a bullet - every time I seeked a measurement - the darn little pc. of brass would remain in the chamber.
Used a Hornady OAL seating tool to withdraw that little pc of brass.
I pulled the bullet from the brass - and reseated it again - this time much further out.
Then it worked - I had seated the bullet too deep to begin with.