What is this Thing?


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saaman
March 14, 2012, 01:25 AM
This came with some reloading gear but I don't know what it is or what it is used for.
http://i117.photobucket.com/albums/o75/saaman/calibers.jpg

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Tilos
March 14, 2012, 01:32 AM
It is used to compare OAL of loaded rifle ammo using the correct size hole to contact the bullet at the ogive.
Then measure over it to the base, primer end of the case.

Find one at an online retailer like Midway and read the description or go to a major reloading mfg. site.

here's one:

http://www.midwayusa.com/product/746974/ptg-bullet-comparator-22-24-25-26-28-30-calibers

Someone will be along to correct me soon...be patient.
Tilos

saaman
March 14, 2012, 02:17 AM
Thanks very much Tilos--that gives me a name and function. Not sure how I would translate that measurement into adjusting my seating dies, but that seems to be the purpose.

Old Dog Man
March 14, 2012, 02:42 AM
Insert your losded round in the proper cal. hole, measure with calipers from cose head to other side of tool. Then measure the tool only across the opposing flats and subtract that from your shell reading. That gives you the OAL of that round. If you need to make it longer or shorter, you need to know how far it is from bolt face to rifling. Or you can check a factory round that works well in your rifle and duplicate that OAL. Al

jinxer3006
March 14, 2012, 10:34 AM
Insert your losded round in the proper cal. hole, measure with calipers from cose head to other side of tool. Then measure the tool only across the opposing flats and subtract that from your shell reading. That gives you the OAL of that round.

That gives you the length to the ogive--NOT the overall length.

Walkalong
March 14, 2012, 10:46 AM
Sinclair makes them.

http://www.sinclairintl.com/.aspx/pid=34262/Product/Sinclair-Hex-Style-Bullet-Comparators

saaman
March 14, 2012, 04:18 PM
Thanks everyone--now I understand how to use it. The Sinclair site has a video that explains it. This tool solves a problem I have often wondered about--differing ogives cause different points of contact with the seating nose and with the rifle chamber next to the rifling.

kelbro
March 14, 2012, 05:14 PM
The one that you have is more versatile than the Sinclair. You would have to buy both Sinclair models to get the calibers that yours has drilled.

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