Gas Checks

Gas checks for sale. Gas Checks are copper cups that crimp onto the base of a cast bullet to protect the lead from hot, burning gases. This protection also helps to reduce lead fouling (the build-up of lead inside a barrel). Clicking on the links below will open a detailed description of the gas check for sale in a new window on eBay.

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Gas Check Die Maker (Standard, Plain Base, and Custom)
Gas Check Die Maker (Standard, Plain Base, and Custom)
$110.00


Patmarlins Checkmaker Gas Check Forming Tool and Die Set in 30 cal
Patmarlins Checkmaker Gas Check Forming Tool and Die Set in 30 cal
$139.00


RCBS 32-170-FN bullet mold for Win. 32-40, 32 Win. Spl. with top punch # 550
RCBS 32-170-FN bullet mold for Win. 32-40, 32 Win. Spl. with top punch # 550
$66.00


Lyman Gas Check Seater
Lyman Gas Check Seater
$20.00


LEE 90046 Bullet Sizing Kit .356 Diameter
LEE 90046 Bullet Sizing Kit .356 Diameter
$26.91


LEE 90055 Bullet Sizing Kit .452 Diameter
LEE 90055 Bullet Sizing Kit .452 Diameter
$26.91


Ideal Bullet Mold – 457-406 – .45-70 Cal – 475 Gr – SC Gas check
Ideal Bullet Mold – 457-406 – .45-70 Cal – 475 Gr – SC Gas check
$90.00


LEE 90038 Bullet Sizing Kit .309 Diameter
LEE 90038 Bullet Sizing Kit .309 Diameter
$26.91


LEE 90060 .401 DIAMETER LEE BULLET SIZING DIE KIT
LEE 90060 .401 DIAMETER LEE BULLET SIZING DIE KIT
$26.91


LEE 90037 Bullet Lube & Sizing Kit .308 Diameter
LEE 90037 Bullet Lube & Sizing Kit .308 Diameter
$26.91



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A gas check is a thin, circular metal disc that is placed on the base of a lead bullet before it is loaded into a cartridge. Gas checks are used to protect the base of the bullet from the heat and pressure of the expanding gasses during firing. This helps prevent deformation or damage to the bullet, and it can also improve accuracy.

Gas checks provide a seal between the bullet and the barrel. They are usually used with cast lead bullets, which are softer than jacketed bullets and can deform under the high pressures generated during firing. By attaching a gas check to the base of the bullet, the gas check helps to prevent the lead from deforming and seals the bullet to the bore, preventing gas blow-by and maintaining accuracy.

To use gas checks, the reloader must first size the lead bullet to the correct diameter using a sizing die, and then seat the gas check onto the base of the bullet using a gas check seater tool. The seated gas check is then crimped onto the base of the bullet using a crimping die, which helps to hold the gas check in place during firing.

Gas checks are made from a variety of materials, including copper, aluminum, and steel. They are available in a variety of thicknesses and sizes, and they can be either crimped or glued to the base of the bullet.

Gas checks are not always necessary, but they are a good idea for high-pressure cartridges or for bullets that are made from soft lead. They can also be helpful for improving accuracy, especially with cast bullets. Not all bullet designs are compatible with gas checks, and it is important to consult reloading manuals and other resources to determine if gas checks are appropriate for a particular bullet and cartridge combination.