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Originally Posted by markg
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He told me I didnt need it and he made me a rod with a tool that clamps down so you can measure the difference between the bolt face and when you put a bullet in pushed to the lands. This is his preferred method and he thinks you get a more accurate reading. I argued a bit about it needing to be measure off the lands and he responded with " the bullet is pushed into the land."
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I have built similar tools, but these are more cost effective than building, (and better unless you use a lathe).
Sinclair # 749-000-266WS
Cleaning rod stop - large
Mfr Part: 021020
http://www.sinclairintl.com/gun-clea...ku=749-000-266
or a set of 4, (Possum Hollow - EJS cleaning rod stops)
http://www.brownells.com/gun-cleanin...-prod7921.aspx
If you tighten one on the rod against the bolt, then another with the rod against a bullet tip held against the lands, the COAL = distance measured between the stops + the lower stop thickness.
These stops are also useful for cleaning / lapping with J-B compound and other tasks.
Quote:
Originally Posted by markg
I tried to take a measurement to determine my seating length but I managed to screw it up somehow. (no fault of my smith) I just suck at mechanical stuff. I got a coal reading that is somehow short of the ssami coal so I must be doing something wrong.
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You may have not added the thickness of the lower rod stop,
or your smith may have used a reamer with a throat shorter than SAAMI spec, which may allow you to feed best COAL cartridges from your magazine. (Many/most SAAMI spec/factory chambers will be too long to allow this)
I suggest you also measure the chamber length to determine your proper trim to length, (as the custom reamer may also cut a shorter than typical factory/SAAMI chamber)
http://www.brownells.com/reloading/m...prod32925.aspx
Some very useful tools are also inexpensive.
I also suggest you compare the OD of the fire-formed neck with the resized neck OD after seating a bullet. This will determine how tight the chamber neck is and whether/how much the case neck needs to be turned.
You will also want to measure the OD before seating the bullet to determine the proper neck bushing size to obtain your desired neck tension.
Good Luck, YMMV.