Something observed with Hornady lock and load tool

[bigbear_98]

Everyone is posting about coal and chamber length. I was doing some experimenting the other day with my chamber using the hornady gauge. I measured with a sinclair 30 degree bump gauge
The case that hornady sends out is 1.514 oal. 1.128 from base to shoulder.
My once fired brass (9pc out of 10) is 1.510 oal, but 1.138 base to shoulder. Since the shoulder is what stops the case in the chamber, the lock and load case would be .01" short of my breech face. Which means the bullet will be .01" out of the lans when chambered if I go by this tools measurement.
Now I'm not planning on jamming my reloads into the lans, and I know I will be bumping the once fired brass back when I resize, but I was interested to see such a large difference in my once fired brass and the tools brass.

What do yall think about it? Is everyone accounting for this difference when measuring?

This also leads me to ask, how much do you bump the shoulder back on a semi auto? On my bolt gun I only bump it .003 when I resize it and that is after 5 reloads on a batch.

[Tedward]

What barrel manufacture do you have? Is it the BHW with a 264LBC type I bolt?

[bigbear_98]

What barrel manufacture do you have? Is it the BHW with a 264LBC type I bolt?

Nope. Krieger. SAAMI spec Grendel with Maxim bolt.

I have had no issues since I put the maxim bolt in and I don't think that I have a chamber problem. I just noticed this and thought I would bring it to the hoarde to discuss.

Take a moment and measure your once fired brass. I would bet money it isn't per the above drawing or it wouldn't feed. The chamber has to be bigger.

http://www.saami.org/PubResources/CC_Dra...rendel.pdf

[seatleroadwr]

I noticed the same thing. There is a post on this forum describing how to make a case the performs the same task as the Hornady tool. You cut slots in a properly sized case neck, polish the inside of the neck with a bit of fine grit sand paper, insert a bullet into the neck and then force the whole cartridge into the chamber. The lands will set the bullet back into the case giving a very accurate reflection of the point where the bullet and the lands come in contact. Push the cartridge out of the chamber with a cleaning rod. Once you get the hang of this system, you may put the Hornady tool back in the tool box.

[bigbear_98]

I noticed the same thing. There is a post on this forum describing how to make a case the performs the same task as the Hornady tool. You cut slots in a properly sized case neck, polish the inside of the neck with a bit of fine grit sand paper, insert a bullet into the neck and then force the whole cartridge into the chamber. The lands will set the bullet back into the case giving a very accurate reflection of the point where the bullet and the lands come in contact. Push the cartridge out of the chamber with a cleaning rod. Once you get the hang of this system, you may put the Hornady tool back in the tool box.

This is exactly what I have done with all of my rifles up to my Grendel and it has always been perfect.. Then after reading here about this tool so much, I had to try it.