Question reguarding the taper to the neck

[MikeH]

new to rifle.

While setting up over all length, and confirming I would not be sitting on the lands I encountered this.

This area is touching first when chambering.

The brass is case guaged on a dillion case guage and checks out.

Is this going to potentially cause over pressure issues, or only going to be a pain to close the bolt until the brass is formed to this rifle?

 

[curtmg]

Was it fired in the same gun? Did you neck size or full length resize. If it was fired in the same gun, it should be fine. If you neck sized brass from another gun, that's usually advised against, I have no idea what do to in that case. New brass, or brass from another gun, should be full length sized, to bring it to SAAMI spec before loading.

 

[MikeH]

Full length sizing die.

Did some more double checking and something musta messed up w/ the trimmer. (me)

.012 to long to start w/.

Going to trim some to the right length, and start again....

Some same gun, some different. No way to tell at this point.

 

[yodave]

back to step one

trim lenthg will not cause the shoulder to rub on the chamber like that. full length size and trim all of your brass to the same length.

take just a bullet and put it into the chamber, push it up to the lands with a pencil, insert a cleaning rod down the bore until it touches the nosed of the bullet. Now draw a line on the cleaning rod with a sharpie. Next remove the bullet and close the bolt on an empty chamber, insert cleaning rod abain until it touches the bolt face and again draw a line on the rod at the end of the barrel. Take your calipers and measure between the two lines, this is your maximum OAL to the lands, if you want a ten thou jump then take ten thou off of this measurement and set your seater die accordingly. I hope this makes sense to you, if not keep asking questions and we will steer you in the right direction

 

[MikeH]

Still the same - trimmed to 2.005, then full lenth re-size on a dillion carbide die

brass checks out on a dillion case guage.

 

[MikeH]

Currently not fighting with running up to the lands.

Still fighting w/ the length to the neck being to long.

I cannot chamber empty brass, that was re-trimmed to the right length, (2.005, working with 308) then full length re-sized.

I have then case guaged the brass, and all checks out, but that brass will not chamber.

This rifle has not had any issues being fed factory ammo of all types.

 

[yodave]

seams ass backwards, first full length size then trim

drop your die down a little bit everytime until the brass chambers with a slight amount of force.

Brass from another rifle even after full length sizing may not neccassarily fit your chamber, I know it should but sometimes it will not.

 

[bruno]

i believe that is where the case is supposed to touch. all rimless bottle-necked cartridges use the shoulder to maintain proper headspace. un;ess i'm missing something???

 

[yodave]

I am guessing the shoulder is hitting but the body of the brass is to long to close to bolt on.

 

[Why not?]

.........This area is touching first when chambering.

That is perfect headspace! The shoulder should contact the chamber liked that.

Ted

 

[John Y Cannuck]

X2 perfect, zero headspace.
If the neck was too long, you'd see marks on the neck, or a crumpled shoulder.

 

[MikeH]

OK awake now, so thinking things thru more.

yodave - I actaully trimmed first as the brass was .030 to long, then F/L resize, then check O/A length, then trimmed again on the last batch last night. ( had to take off .005, which seemed normal to me)

With that amount of over size, it looks like these were fired in a 7.62 chambered gun. Might as well give up on them, and just work on the ones that seem good.

The die is turned all the way down to the shell plate

It sometimes takes a huge amount of force to close the bolt. I actaully had a stuck case last night....

WhyNot & Johhy Y - Thanks for the info - never ran into a factory shell touching like that and it just seemed weird. I was concerned that there was chance of overpressure from running it up that close.

 

[John Y Cannuck]

Factory cartridges have to fit multiple chambers, not just yours, so minimal specs are in order.

 

[H4831]

1) Properly lubed, that doesn't mean too much lube, just right amount of good case lube, and pushing the shoulder back, hard, should not stick your case in your die.

2) It sounds like you may be stretching out the neck as the inside resizer is pulled from the case.

3) Before going into the resizing die, clean and/or lube, just a bit, the inside of the neck.

4) With practice you will know how much pressure it takes sizing the inside of the neck, before there is danger of stretching the neck.