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For anyone casting their own .30 caliber bullets, gas checks are one of those small parts that make a big difference at the muzzle. A gas check is a thin gilding metal cup that snaps onto the base of a cast bullet designed to accept one. When the powder lights off, that cup shields the soft lead base from the hot gases that would otherwise cut and melt it, which is where a lot of leading and accuracy problems start. This box of 1000 covers the .30 cal / .308 diameter family, so it works for the usual suspects like .30-30, .308, .30-06, and .300 Blackout cast loads.
The payoff here is twofold. First, that metal cup seals the bullet base and grips the rifling, which cuts down on the lead fouling that plagues plain-base bullets pushed hard. Second, because the base stays protected, you can run higher velocities than a bare cast bullet would tolerate without smearing lead down your bore. If you want to load cast .30 cal past mild plinking speeds, gas checks are how you get there.
These are crimp-on checks, so they set up cleanly in a lube-sizer or a push-through sizing die. You set a check on the base of each bullet, then run the bullet through the die. The pressure squares the check up and crimps it firmly in place while the bullet gets sized and lubed in the same stroke. A lot of casters just sit down with a can of bullets and a box of checks, snap them all on ahead of time, then size the whole batch at once.
One thing worth knowing before you buy: your bullet has to be a gas-check design. Those molds cast a smaller-diameter rebated shank at the base for the check to grip. Plain-base bullets won't take one. If your mold is cut for a gas check, this .30 cal size is what you want, and a thousand per box keeps a regular caster stocked for a good long while.
They fit .30 caliber cast bullets that are specifically designed to accept a gas check, meaning the mold casts a smaller rebated shank at the base for the check to grip. This covers common .30 cal / .308 diameter loads like .30-30, .308, and .30-06. Plain-base bullet designs won't take a gas check, so check your mold first.
You set a check on the base of the bullet, then run the bullet through a lube-sizer or push-through sizing die. The pressure squares the check up and crimps it on while the bullet is sized and lubed in the same pass. Many casters snap the checks onto a batch of bullets by hand first, then size them all at once.
You don't have to use them, but they help a lot once you push velocities up. The check seals the bullet base against hot powder gases, which reduces leading in the barrel and lets you run faster loads than a bare cast bullet would handle cleanly. For mild plinking speeds you can often skip them, but for hotter rifle loads they make a real difference.
That depends on how much you shoot cast .30 cal, but a thousand-count box keeps most regular casters stocked for a good while. It's a practical quantity if you load in batches and don't want to reorder constantly. Stored dry, they hold up fine on the shelf between casting sessions.
| UPC | 011516272676 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 2827267 |
| Shipping Weight | 0.5188 |
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