Easiest way to make a chamber cast? And then...

poweredbybeer

poweredbybeer

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I've never done this before, but I've been wanting to for some time, since I've heard bad things about the throat area and bore/rifling tolerances of Chinese SKS chambers. Is there an easy way to do this with essentially no tools? If not, how much would it cost for a gunsmith to do it?

Not only that, once the chamber cast is done and I find out just how ugly the chamber/throat is, how would one go about re-cutting the chamber on an SKS? Because the barrel is threaded and has a gas port at a fixed location on the barrel, I don't think it's possible to just knock the barrel back 1/2" and re-ream the chamber. Can a gunsmith make an insert to repair an out-of-tolerance chamber & throat in this case? Any help would be much appreciated :D Thanx!
 
The bore is chrome plated, this could pose a problem. Installing a chamber insert may not be a good idea for safety reasons. Also, the cost would be more than the rifle is worth. I suppose a custom barrel could be fitted, but once again the cost would exceed the value of the rifle.
 
The tools need to make a chamber cast are pretty basic, a funnel to pour the molten metal, a small pot to melt it in, a small wad of cloth to plug the bore and a cleaning rod to tap the casting out.
The trick is that very few alloys are suitable for this task. CrerroSafe being the typical one, and it goes for about $16 per pound, if you can find it.
 
Lightly oil the chamber, also don't overheat CrerroSafe but use it as soon as becomes liquid. I use a hot air gun. a tin foil funnel works well for odd angles into various actions because the last thing you need is is this stuff leaking . With a rough throat CrerroSAfe can stick and require a hell of a pounding to remove, ditto with going too far into the bore. If it can't be removed without risk of damage use the heat gun on the barrel and melt it out
 
I got Cerrosafe from Brownells and the instructions say to degrease chamber and bore first, oil can prevent filling out. the cast shrinks in the first 30 min so tapping out is no problem.

As a funnel I use plastic such as found on cofee can lids, cut to fit. I heat it with a heat gun along with everything else. the plastic doesn't conduct heat away from the cerrosafe as fast as tinfoil and the alloy easily peels away once the pouring is done and what was left on it solidifies.
 
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