Case length gauge for 300 ??

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Case length gauge for 300 ??

Post by Novicereloader » Sat Jun 06, 2020 9:50 pm

Hello all,,
Looking to reload ammo for 300 and trying to find a Lyman or other grade that has a case length gauge? I know 1.368 is case length for 300 blackout but how can you check your brass?
The Ez- case length gauge checker from Lyman doesn’t have that size on it? Please help?

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Re: Case length gauge for 300 ??

Post by BoomerVF14 » Sun Jun 07, 2020 8:05 am ... ace-gauges

Many reloaders also use the Sheridan slotted gauge and swear by it, myself included: ... ion-gauge/

It's pricey but worth every cent.

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Re: Case length gauge for 300 ??

Post by 20X11 » Sun Jun 07, 2020 9:41 am

Lyman makes the EZ MSR version that does have 300blk... ... -gauge-msr
Last edited by 20X11 on Mon Jun 08, 2020 9:43 am, edited 1 time in total.

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Re: Case length gauge for 300 ??

Post by flamatrix99 » Sun Jun 07, 2020 11:48 pm

I have a slotted one from Sheridan Engineering.

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Re: Case length gauge for 300 ??

Post by ThreeHundredBlackout » Mon Jun 08, 2020 5:12 pm

Slotter Sheridan here as well, great tool.
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Re: Case length gauge for 300 ??

Post by exexex » Wed Jun 10, 2020 8:54 am

These are full-dimension case gauges, not just length: Brownells has Lyman. ... 55081.aspx

I've also used gauges from Wilson and Sheridan. All have worked very well.

+1 on Sheridan slotted: overkill for my minimalist use (if case fits, it shoots), but very nice.

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Re: Case length gauge for 300 ??

Post by Cheyenne » Thu Jun 11, 2020 9:54 am

I bought a Wilson gauge from Dillon Precision. ... 25549.html

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Re: Case length gauge for 300 ??

Post by FightingSquirrel » Mon Jun 15, 2020 2:55 am

I just purchased an awesome gauge from Whidden Gunworks:

John Whidden has developed several unique reloading tools. This particular gauge will allow you to measure a fired piece of brass and measure your chamber's exact headspace. I use this measurement and back off from it about .002 as the setting for my resizing die. It is easy to use and you get extreme accuracy from it.
~The Squirrel

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