Advice on chamber casting

[hkim]

Can anyone offer advice on how to make a chamber cast with cerrosafe? The instructions from Brownells are no brainer straightforward, but I have spent a whole day on this with no luck yet. Though easy to melt, once removed from heat for pouring, the cerrosafe freezes up so fast that it will no longer flow into the chamber. It only flows well when overpoured very quickly, which then leaves a plug too big to remove from the barrel extension lugs. It behaves much like solder without the flux. I used a double boiler to heat the cerrosafe and also preheated the barrel.

Why am I doing this? The barrel has chronic high pressure signs with factory .308 ammo,deep ejector marks on the case head) and I suspect improper throating from the gunsmith. Measuring a chamber casting would be the quickest way to diagnose. Advice on the cerrosafe would thus be greatly appreciated.

H.K.

 

[treeman]

make a funnel out of paper that fits in the chamber. then any excess will be in the funnel not in the lug reccesses. hope this helps. i also heat,melt) mine with a heat gun in the bottom of a pop can with a pouring spout bent in it and a small pair of vise grips as a handle. hope thiss helps.______treeman