10 mm /.40 S&W Caliber Aluminum Plain Base Gas Checks

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1. Look good but...

   Posted by Rod O. on Jun 17th 2025

   I seated these base first with a LEE .410 push thru die then followed with w LEE .401 die nose first. The finished product looks great however I could see no difference in accuracy or velocity when compared to the same bullet Powder coated. Fired in my Ruger 38-40 Blackhawk.

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2. Work great

   Posted by Rocky Road on Sep 16th 2024

   I have a lot of lead bullets for 40/10mm. I loaded a few for my 10mm Glock 40. and found they were too soft, just tore a ragged hole in the target. and left lead even in an after-market barrel. Once I put the gas checks on they work fine. They're accurate now and minimize any lead in the barrels. I'm happy that I found Sage.

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3. These kept me from leading in my Glock 20

   Posted by Cory Ramsett on Sep 14th 2024

   No matter what I’ve done I keep getting leading in glock 20 gen four factory 10mm barrel. I’ve tried five different alloys and also factory produced cast ACME bullets. All left lead streaks in my barrel after 6 to 10 rounds. I tried Sage’s plain base gas checks and it fixed the leading issue. I even undersized a few by accident running loaded ammo through my lee bulge buster/ AKA lee crimp die with the crimp stem removed. It sized them down to .3995” and didn’t get leading using these gas checks! I’m sold!!! Thanks for a great product! I’ll be buying more.

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4. Go on easy

   Posted by Unknown on Aug 19th 2024

   Can’t wait to give them a try. I was disappointed at first when they showed up because they’re uneven around the edges and look like a beer bottle cap. I installed them upside down in my lee sizer. The bases were rounded, so I turned them upside down and ran them through again to flatten the bases. The edges that look like a beer bottle cap still were uneven, but I think it’s probably just superficial. I probably will try anneal them next time around and see if the edges smooth out when installing. I also put an extra coat of powder coating over the top of the gas checks to try and even out the existing folds in the gas checks. I’m sure they will work great. Getting a leading in my Glock 20 with soft alloys so I’m guessing this will fix my issue.

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5. Fixed a Problem

   Posted by Ronnie on Jun 17th 2023

   Had some plain base 10 MM cast lead HP bullets that were too soft for the velocity / pressures of the load without leading. The plain base gas checks solved that problem, just purchase another 1500.

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6. Never knew plain based bullets could be gas checked

   Posted by Steve Rusan on Mar 30th 2023

   Found out from a friend that Sage's sold gas checks for plain base bullets which has allowed me to use my old bullet molds for my 10mm and 41 mag. I was having leading problems until I starting using the aluminum gas checks on my plain base bullets. 10mm and 41 mag.are just too hot not to have gas checks. Thanks for making this product

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7. Works well for 41 Magnum too

   Posted by Unknown on Sep 11th 2022

   I buy these mostly to use for 41 Magnum, I originally bought them to use up some older 40 caliber cast & lube bullets as they help so much at reducing lube smoke. At the indoor range I shoot at, very few even shoot revolvers, much less cast bullets in revolvers, the young guys that work there, most have never even seen a conventionally lubed bullet, they only know about Hi-Tek coated if they know anything at all about lead bullets.
   One thing I have found with all these plain base checks, is they can be very difficult to put on a bullet if it's not a bevel base style, but if it is, they go on my 41 caliber bullets and work very well.
   

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8. Improves performance of soft cast bullets

   Posted by GaryB on Nov 15th 2021

   I had a quanity of 40 cal bullets that were cast from of a very soft alloy, and shot poorly. I deceided to try these gas checks, just to see how they worked. I bought 500 of them. They were very reasonably priced. Bullets were previously sized to .4005, and lubed. The gas checks, easily slipped onto the bullet bases. I ran them base first through my Star sizer, and they came out perfect. I fired some from an arm rest, and they grouped well.
   
   As I stated, these bullets were cast soft, and still it took a little effort to crimp the gas checks on the bullets. If the bullets were cast much harder, it would place undue stress on the sizer crimping them. Probably the Lee sizer would be the way to go for these. But then again, if the bullets were cast hard, you wouldn't need gas checks.

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9. .40 caliber/10mm Plain Base Gas Checks

   Posted by David J. Caldwell on Oct 21st 2020

   Excellent product. Great Quality, Highly recommend those product.

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