260 remington question

[br2121]

Been reloading for my 260 LMT MWS. It cycles fine with new brass but once I reload it, it gets inconsistent. It will short cycle sporadically. It's like the bolt doesn't go all the way back and grab the next round. I thought it was the powder but I can use the same load with new brass and it cycles fine. any suggestions?
I'm using:

• Lapua brass
• blc(2) or Varget
• foresters dies
• 123 a-max or 140 gr nosler
  • I check it using a wilson case gauge

the 308 barrel cycles fine. tried different mags as well. when it does chambers it fires fine. Not sure what it could be. any suggestions will be appreciated.

[Enfield47]

Are you full length sizing? Maybe they aren't getting sized enough after being fired. Maybe run them through twice just to make sure. Also check your case length on the ones that are causing you problems and verify it is the same length as your new brass.

[ar15barrels]

Been reloading for my 260 LMT MWS. It cycles fine with new brass but once I reload it, it gets inconsistent.

Do you have an accurate and repeatable method to measure the shoulder bump during re-sizing?

[br2121]

Do you have an accurate and repeatable method to measure the shoulder bump during re-sizing?

I run the case through the forster FL die and then check it with the le wilson case gauge. It falls within the tolerances of the case gauge. Is there another tool that is better?
thanks for the help...

[ar15barrels]

I run the case through the forster FL die and then check it with the le wilson case gauge. It falls within the tolerances of the case gauge. Is there another tool that is better?
thanks for the help...

A wilson case gauge does not tell you ANYTHING about the dimensions of your actual rifle's chamber.
I have measured case gauges and seen them be off by as much as 0.004" from SAAMI specs.
I have seen guns off BOTH WAYS from SAAMI specs by 0.003" or more.

You could use your wilson case gauge as a basis for a case comparator if you had a case protrusion micrometer or a reverse depth gauge.
Then, using your measuring setup, you could measure fired cases to get a baseline of your gun's actual chamber dimensions.
Then, you could accurately measure what your reloading dies are doing when you size your cases.

[br2121]

A wilson case gauge does not tell you ANYTHING about the dimensions of your actual rifle's chamber.
I have measured case gauges and seen them be off by as much as 0.004" from SAAMI specs.
I have seen guns off BOTH WAYS from SAAMI specs by 0.003" or more.

You could use your wilson case gauge as a basis for a case comparator if you had a case protrusion micrometer or a reverse depth gauge.
Then, using your measuring setup, you could measure fired cases to get a baseline of your gun's actual chamber dimensions.
Then, you could accurately measure what your reloading dies are doing when you size your cases.

will loose primer pockets cause a short stroke? I noticed after I resized the brass the new primers are really easy to push in. thanks again for any help...

[nubrun]

Loose primer pockets on Lapua brass after one firing means you have a hot load. Might be part of the problem you are having with chambering fired brass. Have you checked your brass for overpressure signs?

[br2121]

Loose primer pockets on Lapua brass after one firing means you have a hot load. Might be part of the problem you are having with chambering fired brass. Have you checked your brass for overpressure signs?

yes, the primers are pretty flat. But I don't see any extractor marks. Even with new brass I had better luck with it cycling with hotter loads. I worked them up close to the max load then backed it off some. With the lighter loads it wouldn't cycle at all.

[ar15barrels]

yes, the primers are pretty flat. But I don't see any extractor marks. Even with new brass I had better luck with it cycling with hotter loads. I worked them up close to the max load then backed it off some. With the lighter loads it wouldn't cycle at all.

What IS your exact load?