Case Gauge

$ 64.00$ 106.00

Use the chart below to reference the other compatible calibers for each gauge. If you don’t see the Case Gauge you need, we can custom build you one with your supplied Go Gauge. Select the “Custom” option in the drop down menu and follow the instructions.

Attention: The Belted Magnum Family Case Gauge will headspace off the belt of the case, not the shoulders. If you are looking for a tool to measure shoulder set back, please take a look at our Shoulder Bump Gauge. (Illustrated in chart below.)


Whidden Gunworks is pleased to offer Case Gauges to complement your handloading process. The Case Gauges can be used to determine your own rifle’s headspace and whether or not it falls within SAAMI specifications. Additionally they can be used to determine the headspace of factory ammunition or hand loads and see how they compare with your own chamber. The Case Gauges also can give you information on how to adjust your resizing die to give the optimum amount of shoulder setback during sizing.

The Case Gauges feature all stainless steel construction. They have easy to read markings and they are calibrated using actual Pacific Tool & Gauge headspace gauges. Most Case Gauges will work with several cartridges, so please see the compatibility chart for more information on choosing the right Case Gauge for your application.

Case Gauge Chart
GaugeCompatible Calibers
.223 Rem17-223, 20 Practical, 223 Wylde, 5.56 NATO, 6x45
.224 Valkyrie
BR20 BR, 22 BR, 30 BR, 6mm BR, 7mm BR
6mm PPC22 PPC, 30 PPC, 6mm PPC
6mm GT
6mm BRX
6mm BRDX
6mm Dasher
6.5 Creedmoor6mm Creedmoor, 22 Creedmoor
6.5 PRC
6.5x47 Lapua6x47 Lapua, 20x47 Lapua, 22x47 Lapua, 30x47 Lapua
26 Nosler28 Nosler
6.8 Rem
.284 Win6-284, 6.5-284, 22-284, 30-284, 35-284, 270-284, 338-284
.308 Win 7.62 NATO, 7.62x51, 243 Win, 260 Rem, 7mm-08, 338 Federal, 358 Win
.30-066.5-06, 8mm-06, 25-06, 270 Win, 35 Whelen, 338-06
.300 PRC
.300 BLK.221 FB
.300 RUM.375 Rem Ultra Mag, .338 Edge
338 Lapua Mag
Belted Mag Family257 Weatherby, 270 Weatherby, 300 Weatherby, 338 Weatherby, 340 Weatherby, 375 Weatherby, 358 Norma, 264 Win Mag, 300 Win Mag, 338 Win Mag, 458 Win Mag, 6.5 STW, 6.5mm Rem Mag, 7mm Rem Mag, 8mm Rem Mag, 30-338 Norma Mag, 308 Norma Mag, 358 Norma Mag, 300 Brazil, 275 H&H, 300 H&H, 375 H&H, 458 Lott
*Some Ackley Improved Magnum Calibers

Belted Mag CGAttention: The Belted Magnum Family Case Gauge will headspace off the belt of the case, not the shoulders. If you are looking for a tool to measure shoulder set back, please take a look at our Shoulder Bump Gauge.




  1. Chris (verified owner)

    Great product. Should last a lifetime. Very useful in setting up your resizing die.

  2. Bob Lindquist (verified owner)

    Whow! Nice product and so easy to use. setting sizing dies with a caliper setup was ok but using the Whidden case gauge made it real simple, quick and actually fun. I will be ordering others for my other calibers.

    thumbs up WhiddenGun Works

  3. vargetman

    The Case Gage is a well made tool. It is easy to use, well thought out tool. It uses the datum line for the cartridge also. In my opinion it,s the only way to measure correct head space Very easy to set up a die with the tool or to check your head space on your brass or to set your die up with. It is a must have tool for the reloader. I will in the future order for other calibers. Great job Whidden Gunworks. Good people to talk to and deal with.

  4. funnyfarm29709 (verified owner)

    I bought this gauge so I could see if I was anywhere near the desired 2 thousandths of set-back when I full length resize. With this tool I know exactly where I am and exactly how far I need to come back. Now I need the click adjustable Whidden FL sizing die to get the results I’m looking for. Nice polished finish, nice calibrations, Very nice tool.

  5. ronster192 (verified owner)

    The gauge is well made and easy to use. Saved me a lot of time setting up my sizing die. An excellent tool!

  6. chad30 (verified owner)

    Have been using these gauges for about a year now and I just had to leave a review on these fantastic gauges. Fellow reloaders etc told me you don’t need those, don’t spend the $ on them when you can just get a bump kit for your calipers for all your Calibers etc etc. I do have those as well btw and those do have their place but these gauges are time savers and time is $$!
    They are so easy to use & they are machined to perfection. Not only are they precise and fast/easy. They are high quality pieces that are pleasing to use as well as to the eye. They’re worth every penny and will last forever. I have them in .308/ .223/ 300BLK and couldn’t be happier that I found these! I find myself checking my cases more than I need to just because it’s so easy and satisfying. May be overkill to some but If you want the absolute best, I highly doubt there’s any better than these.

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