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  • .458 Caliber Plain Base Aluminum Gas Checks
  • Made with lithographic printing plates, color may vary.
  • Sold in clear plastic heavy duty reusable bags.

.458 Caliber Plain Base Aluminum Gas Checks

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 Product Description

Made from lithographic plate. The .458 Plain Base gas checks are a tall and thin gas check made to grip around the plain base bullets. Care is needed when using these, we suggest orientating the base of the bullet first when sizing them on.

The checks are sold in resealable clear plastic bags. USPS flat rate boxes and First Class mail are used to reduce shipping cost. Most orders ship in one business day Monday through Friday.

Click here for Plain Base Gas Check Information


Sold in 4 quantities: 100 for $4.99, 250 for $9.25, 500 for $17.50 and 1000 for $33.00.

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 Product Reviews

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  1. Finally able to use my 350gn .458s 5 Star Review

    Posted by on Oct 6th 2021

    While these checks are a bit more finicky to apply relative to copper gator checks, they're a simple solution for those PB molds you really want to use and push a bit harder. I would definitely buy these again.

  2. Allows you to push the envelope 5 Star Review

    Posted by on Jul 20th 2020

    These are the second big bore checks I have used with good success. After powder coating these are seated using a polished die and loaded in a 458 Socom. I use a Star sizer and seat base first for perfect fit.

  3. Open up new doors to shooting! 4 Star Review

    Posted by on Apr 11th 2019

    These plain base gas checks are great! I can now shoot cast bullets out of my 458 SOCOM without any lead getting into the gas system.

    Sized up some powder coated cast bullets to .459” and withdraw gas checks as I shot them, it cleaned my barrel!

    Only caveat were 4 or so gas checks had a punch mark on the side so they could not provide a good seal!

    Will buy more!

  4. Great addition to Plain Based bullets 4 Star Review

    Posted by on Dec 31st 2018

    I bought these to use with a plain based cast bullet shot in my .45 Colt. Yes, I know, these are for rifle bullets, but I also used them on rifle bullets I sized down to 0.452 to shoot in my Ruger BH and TC Contender. Initially, I wasn't having very good luck. Just like another reviewer noted, I was ripping the skirt off the cup using a Lee push through sizer. I then figured out how best to use these...put the check on the base of the bullet, lubricate lightly with any case lube, then size the bullet backwards in the push through sizer. I did this sizing to 0.459 first, then stepped down to 0.452. Once that check is on, it is on for good! If you PC your bullets, just clean the lube off before you coat and bake them. I always check, then PC. I've also recommended these to my son, who shoots a 458 SOCOM, and I will definitely buy them again.

  5. very good 4 Star Review

    Posted by on Feb 20th 2018

    turn a black powder cast bullet into a hard cast gas check bullet suitable for a 458 win mag velocity .
    out of my .45-100 sharps . the only thing i prefered it in brass . but in aluminum work great

  6. comsistent, but i cant figure them out. 3 Star Review

    Posted by on Jan 17th 2018

    I attempted to seat these on some plain base .458 bullets. Sizing with a Lee .459 sizing die, these came apart. Usually, one side of the gas check would be sheared off of the bullet after going through the die.

    These may work great on other bullets and /or through lube sizers like Lyman or RCBS. But I can’t get them to work in my particular situation. This is not a condemnation; they just don’t work for me at this point.

    They do seem to be consistent, and should do a good job if they can be seated on your bullets.

  7. So Far So Good 5 Star Review

    Posted by on Nov 29th 2017

    Took a little maneuvering to seat the gas checks. but once on they stayed on. Took my Lee mold bullets from 5in. group to 2in. at 100yds.

  8. Works on 50cal. REAL slugs! 5 Star Review

    Posted by on Nov 20th 2017

    I've been playing with 50cal REAL slugs cast with Lee molds, 250gr and 310gr - working up lite 500 Special loads. I discovered (to my delight) that these will fit on the bottom of those slugs. By using a small needle-nose pliers to slightly open up the mouth of the checks, they will press right onto the bottom of the 50cal REAL slugs, and after running them base first thru a .501 sizing die - the checks are snug. Haven't shot any yet, but I'm looking forward to seeing the results.

  9. Quite Handy 5 Star Review

    Posted by on Nov 29th 2016

    I sometimes "steam" my loads up a little and with these PB checks I don't worry about leading.

    It is probably well worth the time to modify the H&I die by adding or increasing the chamfer area and allowing a smoother transition for the check. I can apply the checks without the modification, but it takes a bit of force.

    These checks make it possible to use my PB molds and still get GC bullets, I find that handy.

  10. Fixed powder coated accuracy issues 5 Star Review

    Posted by on Nov 23rd 2016

    After finding powder coating, and having it work great with many rounds, thought I could skip gas checks forever. That was true for some boolits. The 458 Socom round is not that lucky. These plain based gas checks dropped group size from a huge 12" at 50 yards down to all in same hole, or about 1/2" group size. Still powder coating, but adding these PB GC's first. Problems solved. Using with Lee 457-340F and Lee 457-450F (best accuracy).

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