chamber cast

[boman]

I am wondering if anyone has done a chamber cast on a STG barrel.
I am looking for neck length

[Sig220]

Are you talking about the length of the throat?? At least that is what I call it. What I am talking about is the distance between the projectile and the lands. If we are talking the same thing, a OAL gauge like made by Stoney Point could give you that w/o the mess and hassle of a chamber cast.

If I am waaaaaaay off base.............please just disregard!!

[boman]

sig220---

you're not off base but I am looking for neck length. I have a bunch of assorted brass and don't want to trim if I don't have to---if necks are longer than chamber neck dimension serious pressure problems will result.

[kev]

PM poof and see if he's still got some of this stuff. You're the kind of guy who should have some around.

http://www.falfiles.com/forums/showt...ighlight=alloy

[boman]

kev,


got cerrosafe already just looking for shortcuts.

[Frenchkat]

Boman,

Just revivied an older thread I started, "Am I Boring You?". I had a chamber cast done on two barrels and the measurements are posted.

Don't know if these will help and both were used SA barrels.

Good luck.

[boman]

Frenchkat, You're thread is of some help as those diameters confirm I only need to neck size this brass as it is all undersize those body diameters.

About half of the brass I have is well under sammi spec in length but some is measuring 2.025+ which is 10 thou too long---necks in the FAL barrels are probably long enough to accomodate but don't want to risk it.

I have seen bolt guns that wouldn't open due to high pressure caused when firing untrimmed brass in reloads.