Yes, do not apply heat to get it out
I just cast a 12 gauge chamber and leade a couple days ago.

Here is what I did.
Chamber and lead very clean and dry.
Blocked the barrel just past the leade.
Heated the Cerro-safe
Poured it into the chamber area,
insured it did not cover the rim area of the chamber.

When the metal was hardened,
Using a wood dowel inserted from the other end of the barrel,
knocked out the casting onto a pile of old tee-shirts.
Used the flat of a hammer to knock the dowel rod.

Great casting

Different subject, the 9mm is .358 and the 9,3mm is .366
Your chamber marking is 9x72 so please used a dial indicator to mic the inside of the barrel at the muzzle and report back

Last edited by skeettx; 09/03/11 02:27 PM.
USAF RET 1971-95 [Linked Image from jpgbox.com]