Digital Headspace Gauge

[PatriotHenry]

The short action customs seems to be real popular right now. Do you know if they have any advantage over the Sinclair comparator inserts? The Sinclair is made out of stainless steel and it is machined with an angle to simulate the shoulder.

Hi Mark I am not familiar with the Sinclair comparator. The SAC inserts are caliber and shoulder angle specific, plus they snap in and out of the holder via an o ring no set screw to mess with. Not sure how they compare price wise. The SAC's are 29.99 ea. they were just on sale for $24.95 ea. I think the holding fixture (short or long) is the same price. If you can afford it they sell it as a kit that ends up being cheaper than buying individual pieces. The Sinclair and SAC sound similar.

Modular Headspace Comparator – Kit

This kit comes complete with 4 inserts of your choice, one long body, one short body and the stand. Please make sure you select 4 headspace or bullet inserts. Save $55.00 compared to purchasing individually! *** Solid Bullet Inserts are for bullets similar to Cutting Edge Solids Lathe turned...

shortactioncustoms.com

Check them out and compare.

I really like all of SAC's stuff. I currently use their neck bushings also, and will upgrade to their dies when I can afford it.

PH

 

[tim_w]

It does not actually matter where on the shoulder it measures or even if that place changes from each time you set it up as long as you have a dummy case and its repeatadle from dummy case to one to be sized. (It's not a go guage for chamber reaming to a set spec standard ). Either fire formed or sized to the head clearance you want. Say you want 0.002 bump from the fired case. You measure the fired case anywhere on the shoulder and zero it. Then size your case till its the same. The only requirement is using the same device and dummy case. With a sized ca3s you goal is zero or equal reading. Fireformed it's -0.002.

Personally I want 0.002" less the actual chamber head space dimension (not hessarily that of whatever a fired case is. I get a case to be long to chamber then bump it till it just allows the bolt to drop as zero. Then bump it 0.002. That sets my dummy rd. Use a reamed barrel stub or any comparator bushing ring etc. Must use the same one and know it's unique and doesn't transfer to others even using the same brand and size bushing as they have tolerances.