Case length question/trim-to-length dimensions

[MarTay6]

Gotcha!

 

[expiper]

the Sinclair guage works great ,,,but you can make one with a ctg case with the neck sawed in half and a bullet seated short,,,then close the bolt and it will do the same as the store bought guage,,,I bet someone has a pic of this lil' homemade tool,,,it is nifty,,,Roger

 

[Brians356]

the Sinclair guage works great ,,,but you can make one with a ctg case with the neck sawed in half and a bullet seated short,,,then close the bolt and it will do the same as the store bought guage,,,I bet someone has a pic of this lil' homemade tool,,,it is nifty,,,Roger

Your description doesn't suggest how it actually would work, since a bullet, even one seated backwards (heel forward) will not contact the end of the chamber neck. So maybe you could elaborate?

I came up with my own homemade version of the Sinclair device using a spent 22 LR case (for 22 cal chambers) or a spent 22 WMR case (for 6mm chambers) seated in a fired case, ala the Sinclair slugs. Details in this thread:

http://forum.accurateshooter.com/index.php?topic=3875237.msg36585857#msg36585857

It utilizes the Hornady (nee Stoney Point) "OAL" fixture, but if the case neck was sized to fit the rimfire case tightly enough, you could just chamber and extract the dummy case I suppose.

 

['Freak]

the Sinclair guage works great ,,,but you can make one with a ctg case with the neck sawed in half and a bullet seated short,,,then close the bolt and it will do the same as the store bought guage,,,I bet someone has a pic of this lil' homemade tool,,,it is nifty,,,Roger

Your description doesn't suggest how it actually would work, since a bullet, even one seated backwards (heel forward) will not contact the end of the chamber neck. So maybe you could elaborate?

I came up with my own homemade version of the Sinclair device using a spent 22 LR case (for 22 cal chambers) or a spent 22 WMR case (for 6mm chambers) seated in a fired case, ala the Sinclair slugs. Details in this thread:

http://forum.accurateshooter.com/index.php?topic=3875237.msg36585857#msg36585857

It utilizes the Hornady (nee Stoney Point) "OAL" fixture, but if the case neck was sized to fit the rimfire case tightly enough, you could just chamber and extract the dummy case I suppose.

The brass ring or band left over from hacking free half of the case neck’s length is slid over a seated bullet and left positioned a bit forward. Then when the dummy round is chambered, the leading edge of the band contacts the end of the chamber’s neck area and is slid back on the seated bullet. The position of the band’s leading edge on the seated bullet now indicates the point where the chamber’s neck area ends, or close enuf anyways.

 

[MarTay6]

HA! Now THAT'S very cool! ;D Kudos to whoever thought that up! Didn't really make any sense to me- outside of using the Sinclair gage.... but sliding the ring over a bullet in the shortened case- that's ingenious! Could chuck a case in a caseholder/chuck that in a drill- and hold a razor saw against the case neck to cut it off nicely- or use a Dremel hand grinder with a cut-off disc in it against the spinning case. That'd give you a nice cut.
Wes

 

[amlevin]

the Sinclair guage works great ,,,but you can make one with a ctg case with the neck sawed in half and a bullet seated short,,,then close the bolt and it will do the same as the store bought guage,,,I bet someone has a pic of this lil' homemade tool,,,it is nifty,,,Roger

Your description doesn't suggest how it actually would work, since a bullet, even one seated backwards (heel forward) will not contact the end of the chamber neck. So maybe you could elaborate?

I came up with my own homemade version of the Sinclair device using a spent 22 LR case (for 22 cal chambers) or a spent 22 WMR case (for 6mm chambers) seated in a fired case, ala the Sinclair slugs. Details in this thread:

http://forum.accurateshooter.com/index.php?topic=3875237.msg36585857#msg36585857

It utilizes the Hornady (nee Stoney Point) "OAL" fixture, but if the case neck was sized to fit the rimfire case tightly enough, you could just chamber and extract the dummy case I suppose.

Even easier method. Get a scratch hiding crayon from the hardware store. Just like a crayola but with a harder, stickier, wax compound. Put a line on the side of the bullet from case mouth out about 1/8" from the case mouth. Smooth off so it's not any thicker than the case neck itself.

Chamber the round, remove it, and bingo, there's the front end of the chamber. Just measure to the ridge in the wax.

 

[Brians356]

the Sinclair guage works great ,,,but you can make one with a ctg case with the neck sawed in half and a bullet seated short,,,then close the bolt and it will do the same as the store bought guage,,,I bet someone has a pic of this lil' homemade tool,,,it is nifty,,,Roger

Your description doesn't suggest how it actually would work, since a bullet, even one seated backwards (heel forward) will not contact the end of the chamber neck. So maybe you could elaborate?

I came up with my own homemade version of the Sinclair device using a spent 22 LR case (for 22 cal chambers) or a spent 22 WMR case (for 6mm chambers) seated in a fired case, ala the Sinclair slugs. Details in this thread:

http://forum.accurateshooter.com/index.php?topic=3875237.msg36585857#msg36585857

It utilizes the Hornady (nee Stoney Point) "OAL" fixture, but if the case neck was sized to fit the rimfire case tightly enough, you could just chamber and extract the dummy case I suppose.

The brass ring or band left over from hacking free half of the case neck’s length is slid over a seated bullet and left positioned a bit forward. Then when the dummy round is chambered, the leading edge of the band contacts the end of the chamber’s neck area and is slid back on the seated bullet. The position of the band’s leading edge on the seated bullet now indicates the point where the chamber’s neck area ends, or close enuf anyways.

I knew that's what was being done. Just wanted someone to say as much. The original reference gave no clue. It does require careful sizing of the neck ring so it will slide when chambered, but not slide when being measured. Or fit very tight on the bullet, and the neck adjusted so only the bullet will move when chambered. Etc.

The Sinclair system only has one moving part, and as long as you can close the bolt, it can be as tight as you want in the neck, e.g. use your normal neck sizing die. When you're done you have a permanent chamber length dummy round for that gun.

 

[expiper]

I knew that you knew,,haha,,,I like the idea of the crayon,,,,simple and will work with any cal any neck dia.,,,,Roger

 

[Ackman]

The Sinclair system only has one moving part, and as long as you can close the bolt, it can be as tight as you want in the neck, e.g. use your normal neck sizing die. When you're done you have a permanent chamber length dummy round for that gun.

Why would you need a "permanent chamber length dummy round" for a gun? The chamber length won't change. Leade will grow but the Sinclair plug doesn't have anything to do with that.

 

[Brians356]

The Sinclair system only has one moving part, and as long as you can close the bolt, it can be as tight as you want in the neck, e.g. use your normal neck sizing die. When you're done you have a permanent chamber length dummy round for that gun.

Why would you need a "permanent chamber length dummy round" for a gun? The chamber length won't change. Leade will grow but the Sinclair plug doesn't have anything to do with that.

A fair question. But consider that dummy rounds (I didn't invent the term, after all) of various types have been popular since the earliest days of metallic cartridge reloading. So I could as well turn the question back on you and and ask "Why?" I think I know why.

For myself (probably not unlike others), I am not a great record keeper. And what I do transcribe to paper (or to a digital file) tends to disappear. A dummy round goes into a metal tool box drawer full of same, and cannot easily hide or "walk away" like a sheet of paper or a notebook, or go "poof!' like a digital file. If I forget a chamber's length years or decades from now, I can always dig out that dummy round with the Sinclair slug, whip out the dial caliper, and "Voila!"