So I am a little confused on trimming to actual chamber length of the rifle instead of just cutting your brass to book specs.
This is from the sticky 101 case prep.
"To use a gage like this:
1. thoroughly clean your weapons chamber.
2. take a scrap case and trim it WAY back with your case trimmer, say .050" SHORTER than book spec.
3. Seat you plug gage into the case- long.
4.ease this round into your weapon and fully close & lock the bolt.
5. remove the case gently without bumping the gage. It has hit the end of the chamber and been pushed back into the case by the action of locking the bolt.
Measure the overall length of the case, head of the case to end of the plug and note that measurement somewhere obvious & permanent in regards to loading for this particular rifle. It would probably be a good idea to repeat this measurement three times and average all three readings.
Now until this dimension were to change (barrel removal, etc.) trim your brass just short of this measurment, instead off BOOK trim to length specs.
Once we have our cases all trimmed to a uniform length to our specific rifle we now need to deburr the mouth."
So I measured my .260 chamber to 2.060 using the sinclair gauge insert.
Then I measured about 15 or so of my once fired cases.
anywhere from 2.023 to 2.032
So my question is that it states above to trim to slightly under your actual chamber length. But my brass seems to be well under the 2.060 I measured.
So why is my fired cartridge length not longer? Is it because It was only fired once and it will get longer with firings.
Do I trim to an average between the current brass measurements (2.023 to 2.032) to make them all consistent?
Just a bit confused because the book data shows a case length of 2.035. So all of my Lapua brass is well under this already.
Am I doing something wrong. Do I need to trim etc etc.
Thanks in advance.
This is from the sticky 101 case prep.
"To use a gage like this:
1. thoroughly clean your weapons chamber.
2. take a scrap case and trim it WAY back with your case trimmer, say .050" SHORTER than book spec.
3. Seat you plug gage into the case- long.
4.ease this round into your weapon and fully close & lock the bolt.
5. remove the case gently without bumping the gage. It has hit the end of the chamber and been pushed back into the case by the action of locking the bolt.
Measure the overall length of the case, head of the case to end of the plug and note that measurement somewhere obvious & permanent in regards to loading for this particular rifle. It would probably be a good idea to repeat this measurement three times and average all three readings.
Now until this dimension were to change (barrel removal, etc.) trim your brass just short of this measurment, instead off BOOK trim to length specs.
Once we have our cases all trimmed to a uniform length to our specific rifle we now need to deburr the mouth."
So I measured my .260 chamber to 2.060 using the sinclair gauge insert.
Then I measured about 15 or so of my once fired cases.
anywhere from 2.023 to 2.032
So my question is that it states above to trim to slightly under your actual chamber length. But my brass seems to be well under the 2.060 I measured.
So why is my fired cartridge length not longer? Is it because It was only fired once and it will get longer with firings.
Do I trim to an average between the current brass measurements (2.023 to 2.032) to make them all consistent?
Just a bit confused because the book data shows a case length of 2.035. So all of my Lapua brass is well under this already.
Am I doing something wrong. Do I need to trim etc etc.
Thanks in advance.
