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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 LYMAN IDEAL 375449 375 CAL 264 GRAIN GAS CHECK MOLD With Box $89.00 |
 Gas Check Die Maker (Standard, Plain Base, and Custom) $110.00 |
 Gas Check Die Maker (Standard, Plain Base, and Custom) these are interchangeabl $55.00 |
 30 cal Patmarlins Checkmaker Gas Check Forming Tool and Die Set $129.00 |
 Lyman Gas Check Seater Case $14.95 |
 LYMAN H&I BULLET SIZING DIE .451 DIAMETER 451 2766515 $32.99 |
 Lyman Lyman .355 H&I Sizing Die 2766490 $24.99 |
 LYMAN H&I BULLET SIZING DIE .225 DIAMETER 225 2766463 $32.99 |
 Lyman Bullet Lube-Sizer 4500 450 Lubricator Parts Gas Check Seater 2745881 $18.50 |
 LYMAN IDEAL 311335 206 GRAIN GAS CHECK MOLD FOR .30 CALIBER RIFLES $119.95 |
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.