Folks,

Would like to do a chamber cast on an older, but nice Mauser sporter to see what it is actually chambered for and what the bore diameter really is.

Have the casting material from Brownell's but have never done this.

Any good tips that will save pain and strain?

thanks,

Mike,

Sure. Take the barrelled action out of the stock. Clean the barrel and chamber well. Insert a snug fitting patch through the muzzle end and with a cleaning rod, carefully push the patch towards the chamber. Insert a loaded or dummy cartridge with a bullet in the chamber and advance the patch towards the chamber until you feel it contact the bullet. Remove the cartridge and rod leaving the patch in place.

Fashion a laddle out of a tuna can or something like that in which you can melt a chunk of Cerrosafe material. Lightly spray the chamber area with some WD40 and using a propane torch, warm the barrel/chamber area to the touch. Next melt the Cerrosafe in the laddle with the propane torch and when completely melted, pour the contents into the warm chamber until the stuff starts to overflow the chamber.

Let the barrel/casting material cool for about 10-15 minutes (depending on how warm you got the chamber) and then with a old cleaning rod inserted in the mauzzle end, tap the casting from the chamber being careful not to let it hit the deck.

Be very careful when inserting anything in the muzzle end of the barrel to avoid contact with or damage to the crown of the barrel. This is a basic way to cast a chamber...

Good luck,

Malm

My way is EXACTLY the same as Malm except I use sulfur instead of cerrosafe.