6.5 CM fail

[darkker]

I'm gonna swap it over to a Marlin XL-7 action but need to take .008" off of the breech to get it to headspace. .

Are you sure? I know it got bantered about a lot, years back on the Marlin forum. But I've re-barreled a pair of my XL-7's with a few different Savage prefits, and had no issues setting headspace.

Maybe you got some funky stack tolerances?

Cheers

[Robinhood]

Are you sure? I know it got bantered about a lot, years back on the Marlin forum. But I've re-barreled a pair of my XL-7's with a few different Savage prefits, and had no issues setting headspace.

Maybe you got some funky stack tolerances?

Cheers

Grab calipers or depth mics.
1. Measure bolt face depth. Repeat for consistent reading. Record.
2. Install go gauge into chamber and measure protrusion. Repeat for consistent reading. Record.
3. If the protrusion number is larger than the BH face number you are good.

[yobuck]

I just noticed my age wasn't listed at all, so updated my profile. At the top of the page is a dark blue ribbon and three items have 'drop down menus'. Hit the 'Forum Actions' and you can choose 'edit profile'. You can enter your age near the top of that page. Youth is over-rated, with age comes the beauty of experience. :smug:
I would argue that it isnt over rated at all. The young fools ive known ended up being old fools, but only if they lasted that long.

[tobnpr]

I re-read your original post, you said it was "cobbled together with parts".

What is the history on the barrel? With a chamber defect that caused incorrect headspace and case separations for you, same would have happened for the original owner...

Was it purchased used?

[FiveInADime]

Are you sure? I know it got bantered about a lot, years back on the Marlin forum. But I've re-barreled a pair of my XL-7's with a few different Savage prefits, and had no issues setting headspace.

Maybe you got some funky stack tolerances?

CheersI had to have the breech faced on mine, as well. The breech bottomed out on the bolt face when I went to headspace. Then I measured with a depth mic and found I had to have .010 faced off for proper bolt to breech clearance. Many folks that were actually measuring found the same thing.

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[mnbogboy2]

Moving it to the Marlin LA is probably a good move. Those throaters cut so easy that going too far is just as easy.
The .008 cut off the breech end am assuming is to allow the Marlin to headspace (their bolt heads are so much deeper). If it were me I would only remove enough to allow minimum bolt head clearance (<.005 ?). I believe Marlin protrusion is .140 or so.
Only .008 or so can easily be removed and squared with a bastard if a lathe not available. The web end of the case should not be expanding at that end of the chamber so getting it within .001/.002 square will never be noticed. Make sure to add a slight chamfer at the case mouth and polish that edge free of burrs.
Also any final adjustment to increase the headspace can be also done without a lathe with your reamer & a tap handle.

[Stumpkiller]

Looking back through the thread - he's checked his rifle with GO/NO GO gauges but is using brass fired in "his buddy's rifle" and then he reloaded it. Maybe he should be checking his buddy's rifle?

My Lee-Enfield No 4 sets the shoulder 1/8" further forward on the first shot with new cases. That's the way it was made to allow muddy ammo to function. If I full-length resized I'd get two or three reloads. So I neck resize.

[Robinhood]

I re-read your original post, you said it was "cobbled together with parts".

What is the history on the barrel? With a chamber defect that caused incorrect headspace and case separations for you, same would have happened for the original owner...

Was it purchased used?

Yeah, this is a problem with used parts.

[darkker]

I had to have the breech faced on mine, as well. The breech bottomed out on the bolt face when I went to headspace. Then I measured with a depth mic and found I had to have .010 faced off for proper bolt to breech clearance. Many folks that were actually measuring found the same thing.

Sent from my SM-G965U using Tapatalk

And many of us who measured, didn't need to machine anything;). I just think it's curious, the differences in stack tolerances.

[mnbogboy2]

And many of us who measured, didn't need to machine anything;). I just think it's curious, the differences in stack tolerances.

I've had it happen with stock savage barrel & PTG bolt head. The Marlin case head protrusion is about .140 to begin with so putting a savage barrel on a marlin is most likely going to be too close right off the bat.

[cowboybart]

I re-read your original post, you said it was "cobbled together with parts".

What is the history on the barrel? With a chamber defect that caused incorrect headspace and case separations for you, same would have happened for the original owner...

Was it purchased used?

Yes, 99% of my stuff is used. It is a habit I got into when playing with Mausers. I like this barrel because it is sporter weight. I have several shot out heavy barrels that I could shorten up and thread/chamber, but contouring a barrel is 4 hours of back breaking HELL.