Which gauge for 300 BLK?

redcon1 said:

It says: The gauge is machined to the SAAMI minimum chamber spec for the 300BLK caliber. That seems pretty unequivocal. The JP enterprises gauge is similarly cut to min spec. This is what JP enterprises has to say about their min spec gauge:
JP Semi-Auto Case Gauges
If it fits, it shoots.

Our case gauge has been the go-to tool for gas gun shooters and reloaders for nearly twenty years. That's because we recognized that gas-operated rifles need a "special diet" when it comes to ammo. Unlike a bolt gun, your AR won't reliably function with a cartridge just because it fits a standard gauge. Plenty of frustrating and badly timed malfunctions trace right back to this problem.

This is the only case gauge on the market specifically calibrated to meet the needs of the semi-auto rifle shooter. If a cartridge would not fit a minimum-depth SAAMI chamber, this gauge will catch them. Anything that fits this case gauge, you can consider factory-equivalent ammo.

In this second generation model, we've switched from aluminum to 416 stainless steel for greater wear resistance and longevity. In doing so, we've also significantly improved our tolerances. Side by side, these new gauges catch problem cases even the previous generation wouldn't.

Shoot with confidence that your ammo will never fail you. We won't let it.

So if your ammunition will fit a minimum SAAMI spec gauge, you can be confident that they will fit a minimum saami spec chamber. That's why I buy these gauges-for that peace of mind. Am I missing something?

Click to expand...

mcb said:

Remember the minimum spec for the brass is different than the minimum spec for the chamber.

If you gauge is cut to minimum chamber spec and you reloads go in and out smoothly you know it will work in any rifle with an in-spec chamber.

I don't really want to resize my brass to minimum brass specs. I want to size my brass just small enough to fit reliably in a min spec chamber so I know it will work in any of my 300 BO guns.

Click to expand...

AJC1 said:

If a round fits the Gauge it's not Sammi spec ammunition.

Click to expand...

redcon1 said:

I think you're unnecessarily confusing the subject. I really don't care about SAAMI drawings. I just want an easy way to make sure my rounds are going to chamber in any rifle I own now or may own in the future and these are gauges that guarantee that. Anything that fits this case gauge, you can consider factory-equivalent ammo. There's nothing misleading or confusing about that and there's no need to look any deeper.

Click to expand...

AJC1 said:

I'm not here to argue, I feel as though you understand what I mean, and that in this hobby unlike some others the technical points have important meanings. Have a wonderful day, no hurt feelings.

Click to expand...

Walkalong said:

And this is my understanding of how the Sheridan & JP gauges are set up. If it fits, it ships. Well, chambers, assuming a chamber within SAMMI spec.

Click to expand...