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  • .284 / 7mm Caliber Aluminum Gas Checks

.303 Caliber Aluminum Gas Checks

Out of stock

 Product Description

These are our heavy .30 caliber aluminum gas checks made for .303 rifles or other .30 caliber barrels over .314. These have been tested to .318. The .303 version is a tall gas check, about .010 more gripping area than our regular .30 caliber aluminum gas checks. Made with a thick aluminum, these are meant to be used when a normal .30 won't size up large enough. Works on the average .284 shanks.

Sold in 4 quantities: 100 for $3.99, 250 for $5.95, 500 for $10.75 and 1000 for $19.50.


The gas checks are sold in resealable clear plastic bags. Shipping is based on each item's weight. USPS postage rates are calculated in the shopping cart. USPS flat rate boxes and First Class mail are used to reduce shipping cost. Most orders ship in one business day Monday through Friday.


We also have a copper/gilding brass version of the .303/7.62 mm here: .303 / 7.62 mm Caliber .017 Copper Gas Checks


Our regular aluminum .30 caliber gas checks are a nice option for the average .308 bullet: .30 /.308 / 7.62mm Caliber Aluminum Gas Checks


If you prefer .017 copper/gilding brass we have a .30/7.62 mm gas check that will size to .318 here:  .30 / 7.62 mm Caliber .017 Copper Gas Checks


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 Product Reviews

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  1. M44 mosin eats these up 5 Star Review

    Posted by on Apr 29th 2020

    Great product for the mosin nagant using a 185 lee 303 round nose .
    Lubricated with my own recipe wax then sized to .311.Loaded up with 11.5 grains of trailboss makes for a ultra quiet almost hearing safe subsonic load out of my m44.

  2. the solution for "fat 30's" 5 Star Review

    Posted by on Oct 14th 2019

    Great product and idea. The solution for gaschecking "Fat 30's" cast bullets

  3. Excellent, First Time Using Aluminum Gas Checks 5 Star Review

    Posted by on Apr 7th 2017

    I have seated thousands of copper gas checks. I was looking for checks to fit 7.62 and bought these aluminum .303 gas checks. Using a Lyman Lubersizer, White Label Co. Carnuba Red high velocity wax and Lyman 311291 mould 30 cal 170gr bullets sized to .312" SKS these aluminum gas checks were an excellent tight fit. I place the gas check into the sizing die and then place the bullet into the gas check. These seem to take a little more effort / handle pressure to start the gas check into the sizing die, as compared to copper, but WOW what a nice tight fit on a 7.62 bullet. I thought the aluminum would start easier but since it is somewhat thicker than copper ............... I will definitely buy again! [ and it Sage sure does beat the MidwayUSA highly priced gas checks :-) ]

  4. perfect easy fit 5 Star Review

    Posted by on Sep 11th 2016

    I use it on the lee 303 British 185 gr mold, it's fit nice and easy, i crimp and resize at 0.311" for my win 94 over bored and this gas check gives me the best accuracy and no fouling.

  5. Heavy Metal Rockers 5 Star Review

    Posted by on Aug 4th 2016

    I put these on 200gr, .313 diameter LRN bullets I cast from a Lyman mold, and shoot them in Enfield and Mosin-Nagant rifles. The rifles have worn, over-size bores. I use a .314 Lee sizer die. I can push the bullets hard and get good accuracy and no lead left behind. I'm able to shoot these now at 1800fps instead of keeping them throttled back to 1250.

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