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  #1  
Old 01-22-2009, 06:19 AM
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Lee Mold & Gas Check Question


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After being influenced by all you professionals, I've purchased a Lee 2 cavity, 158 gr. RNFP, mold #90303 for a 357/38... My question: Can I purchase gas checks and put in this mold and pour lead???? OR::: Does the mold have to specifically say "gas check"????
Also purchased Lee Bullet Lube and Sizer Kit #90048. Will this fit in my Lee Loader without any modifications????
Am going to try this when temps warm a littler.
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Old 01-22-2009, 06:50 AM
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Gas checks on bullets designed for them are applied when you run the bullets thru the Lee sizer or a lubra-sizer. It sizes and crimps the gas checks in place when the bullet is forced thru the sizer.

The mold you purchased ( number 90303) will not take a gas check. For that you'd need Lee's number 90422 that has the base cast to take a gas check. Bullet molds have to be designed for a gas check to have one applied to it. Gas checks are never placed in a mold and cast in place, they are crimped on when sized.

You can buy gas checks thru Midway or Cabela's or sporting goods stores that handle them. You buy them by the thousand per box so they last quite a while.

There's nothing wrong with shooting a non-gas checked bullet in your handgun, you just can't push them as fast. I usually shoot them at 1000 fps or under depending on how hard your lead is. Soft lead will need to be shot at lower velocities and hard lead can be pushed some. You can also shoot a bullet designed for a gas check without one if you want.
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Old 01-22-2009, 11:00 AM
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Ok Thanks Faucettb...
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Old 01-23-2009, 07:05 PM
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In addition to Bob's comment, since you haven't used the mold yet, you may not have looked it over? It is a base pour design, meaning you pour the molten lead alloy into the base end of the bullet. Even if you could put gas checks in the mold, they would block the lead alloy from filling it.

An alternative to a gas check is the P-wad. This is a plastic disc the diameter of the bullet that goes under it before seating and obturates (is expanded to fill the bore diameter and seal it by pressure) more readily than lead, and effectively seals the bullet bass off from the hot powder gases. 0.060" Low density polyethylene (LDPE) sheet is a common material choice. You can get it in 4'x8' sheets from a plastic supplier for about $50 these days (was about $10 when I got one 20 years ago; oil prices I suppose). You can cut them out with a sharpened case, though that gets old fast. You can buy a commercial version from NECO, but they aren't cheap. They do prevent leading, though. Really well.
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Last edited by unclenick; 01-24-2009 at 10:35 PM.
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Old 01-24-2009, 06:06 AM
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Like Faucettb said: I don't think I will need a gas check for the 357, as I am only shooting it in my pistol. Am going to check the fps for the bullet load. Shouldn't be too fast as I am only using the Lee dipper for the load.... Anyway I appreciate all the help from yous guys... Read about bullet mold lubing, so have to study up on that.... Man isn't all this stuff dissapearing "FAST"......
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