These are our extra tall copper .30/.303 caliber gas checks.
Made for long shank and large bullets like you would use with .303 British rifles. We use .017 thick 210 copper for these. Made to fit tight on a .284 shank bullet, about .095 tall and will size all the way up to .317.
The gas 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.
Sold in 3 quantities: 250 for $7.49, 500 for $12.99 and 1000 are only $23.99
Our regular .017 .30 caliber gas checks are here: .30 / 7.62 mm Caliber .017 Copper Gas Checks
If you need an easy to size .308 to .314 gas check, we suggest our aluminum .30's made from .015 thick material here: .30 /.308 / 7.62mm Caliber Aluminum Gas Checks
Posted by Doug on Jul 2nd 2019
I use these checks on a 112 gr bullet from an accurate mold. Bullets are used in a 32 h&r mag and ruger 327 mag, sized at 314 they really grip the shank. Accuracy has been great.
Posted by doug lundy on Oct 9th 2018
They work fine but initialally they went on the bullet shank a little loose on a mold from accurate molds. But after sizing they were good and tight . Maybe a little more research on the better mold manufacturers shank diameters could tighten things up a little bit. That being said i know manufactuing specs for different alloys producing consistant shank diameters is problematic. All in all it worked for me. Louie.
Shamus: they have a .283 cup size for a tight fit, your shanks should be at least .284.
All prices are in USD.