TRG 22 Chamber Length

[DamnYuppie]

I have used the Sinclair Chamber Length Gage on my TRG-22 in .308. The results I got were not what I was expecting. After doing it a few times my average was 2.045". Does this seem high to anyone else?

If it is accurate wouldn't that then make my trim to length 2.035"? That also seems really high. I have a feeling I am missing a step in how to use the results of this to determine my trim to length. Any enlightenment/mocking is appreciated!

Brian

<span style="font-style: italic">Edited for spelling</span>

 

[Rthur]

Re: TRG 22 Chamber Length

Brian, what does your brass measure? Is this new brass or once shot?

 

[Mike]

Re: TRG 22 Chamber Length

How are you using it because that number seems way off-by an inch or so?

Are you talking to the lands or the brass length?

 

[DamnYuppie]

Re: TRG 22 Chamber Length

I am reloading brass that was shot once out of my rifle. It was originally Black Hills 175, which is Winchester brass. The brass pieces, after resizing, average 2.010" in length.

Mike to answer your question on how I used it I simply followed the direction that came with it. I took a piece of brass, cut it back .100 shorter then the recommended trim to length. The recommended trim to length in my Sierra reloading book is 2.005" so I trimmed a piece down to 1.905". The I set the insert such that the overall length was .100 longer then the recommended trim to length, so with the insert the overall length was 2.105". I then inserted it into my chamber.

What I am trying to accomplish is to determine my trim to length for my chamber.

BK

 

[Brain]

Re: TRG 22 Chamber Length

TRG22 that I had measured 2.043. My trim length was 2.023.

Fired brass won't tell you anything about chamber length as it doesn't grow in the neck like it does with headspace.

You aren't missing anything in how to use the results. Trim to .020 less than measured length and don't sweat it.

 

[Rthur]

Re: TRG 22 Chamber Length

Brian you could go to 2.035 but I'm thinking you brass would have to grow alot to get there. I would find a the shortest piece of brass you have in your once fired and trim to that. Consistent neck length and tension is what your looking for.

good luck
Art

 

[DamnYuppie]

Re: TRG 22 Chamber Length

Rthur that is a reasonable idea. I agree that it would take a long time for the brass to grow that much.

Now that I have it Is that measurement good for anything else?

BK

 

[Rthur]

Re: TRG 22 Chamber Length

Brian, I guess you know what your max length is. Once you know how much bullet jump your rifle likes you will be set. I think your sako allows you to seat the bullet out. If you don't have a ogive comparitor I would highly recommend one. Hornady or sinclair work fine. Some bullets don't mind jump and some like to be close to the lands. Your rifle will let you know. A chronograph is helpful.

Art

 

[schuh]

Re: TRG 22 Chamber Length

My TRG 22 has the same chamber length , 2.045 . Jack