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RCBS Precision Mic Gage

This is a discussion on RCBS Precision Mic Gage within the Ammunition forums, part of the M14 M1A Forum category; Has anybody used these to set up DIES for 308 and 223. Thanks Packing...


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Old August 1st, 2013, 07:50 PM   #1
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RCBS Precision Mic Gage

Has anybody used these to set up DIES for 308 and 223. Thanks Packing

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Old August 1st, 2013, 08:15 PM   #2
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I used them years ago, but find the Stoney Point system offered by Sinclair are a better deal for quality results. Just my experience.

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Old August 2nd, 2013, 02:41 AM   #3
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I have one. I prefer the Hornady comparitors that you fit onto a caliper--faster to use. For both setting up the sizing die and for measuring bullet ogive lengths.


The dummy case that RCBS supplies for measuring the lands is extremely hard to get a repeatable measurement with. I don't trust it at all and don't use it. I seat a bullet long in a case, then stuff it in the chamber with my thumb. Seat it a wee bit shorter each time. When it drops from the chamber without having to use a fingernail, you now know where the lands are. You can measure the cartridge (COAL or ogive) if you want to track wear on the barrel in the future. I write the bullet on that case and save it for the next time that I need to set the die up for that type of bullet. Then the 1st production round goes in, I measure it, and then seat it 0.020" deeper (or whatever number I want for bullet jump). Way quicker and easier than messing around with dowels and slit-necked dummy cases, etc, plus your die gets set up in the process.

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Old August 2nd, 2013, 06:01 AM   #4
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I used the .308 version to set up my dies. I measured fired brass from my rifle and set up my dies accordingly. I have never used the fake bullet portion.

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Old August 2nd, 2013, 07:09 AM   #5
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I believe that Hornady offerings used to be Stoney Point if I am not mistaken. 30Caliber's description of using thumb to push in and then see if it drops from chamber is the method many of us used long ago when gauges/tools were not available and as he pointed out, works just fine. Be aware that on rifle such as the M14 you will need the angled tube for as opposed to bolt gun, no way to utilize dummy round into chamber and use tool. Using caliper a real number can be determined and user can develop history of wear/tear in throat area. Unfortunately the M14(or similar rifles) limit the user to loading his rounds to max. bullet seating(2.800") in order to function through the magazine regardless of throat erosion. Single loading permits longer seating of course.

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Old August 2nd, 2013, 07:12 AM   #6
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Are you talking about the headspace precision mic or the overall length gauge for your free travel in your chamber?

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Old August 2nd, 2013, 07:15 AM   #7
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For the overall length gauge I use the bullets I am about to load for my free travel. They are not the same lot to lot.

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Old August 2nd, 2013, 08:29 AM   #8
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No I don't like that RCBS Precision Mic. I use the Hornady head space gauge and the LE wilson head space gauge.

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Old August 2nd, 2013, 09:31 AM   #9
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I use a precision mic or .308,30-06 and .223. Works for me.
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Thanks from dozier and 1100 tac
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Old August 2nd, 2013, 09:45 AM   #10
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I use the precision mic when I want an actual number. The Sinclair Comparator/Bump gage gives only a relative number.

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Old August 2nd, 2013, 10:09 AM   #11
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Quote:
Originally Posted by 4Quangs View Post
I use the precision mic when I want an actual number. The Sinclair Comparator/Bump gage gives only a relative number.
I calibrated my RCBS Prec. Mic with a Manson 1.630 go HS gauge.

Doing that, I know that the number I get is the real number.

Silver

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Old August 2nd, 2013, 10:41 AM   #12
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/broken record mode:

Hornady's little anvil for use with their bullet comparator and "headspace gauge" is a must have IMHO:

http://www.hornady.com/store/Lock-N-...ase-Kit-1-Each

Much more consistent than balancing the edge of your calipers on the base of the case head.

I like Sinclair's "bump gauge" inserts better than the Hornady inserts because they're steel instead of some softer alloy. YMMV

/broken record off

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Old August 2nd, 2013, 10:52 AM   #13
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Cool

Quote:
Originally Posted by Ole Silver View Post
I calibrated my RCBS Prec. Mic with a Manson 1.630 go HS gauge.

Doing that, I know that the number I get is the real number.

Silver

That's exactly the way I do it. Can't go wrong that way. dozier

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Old August 2nd, 2013, 03:32 PM   #14
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No

Quote:
Originally Posted by ei276b View Post
Are you talking about the headspace precision mic or the overall length gauge for your free travel in your chamber?
No I know my H.S. I'm trying too set the bullet seating depth just off the lands or what works best for the different bullets i'm using on specific chambers. If info keeps coming in I can sift through it and get a good idea of what is out there. Thank's all for the input. Packing

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Old August 2nd, 2013, 05:48 PM   #15
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I like the Precison Mic for comparing headspace...easy to get consitant mesurements when setting up sizing die. Currently I really like the Redding Dial indicator for me its the best option for headspace comparing....but my Precision mic is a close second.


Keep in mind both of these are comparators....not absolute measurements. I have a forester 1.630 go gauge and a 1.634 no go that comes in handy when I need to calculate exact measurements.

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