doublegunshop.com - home Forums General Discussion German & Austrian Sporting Guns @ doublegunshop.com Drilling dbl 16 X 10.7MM

The Crown over M is a maker's mark, either Belgian or German, and not a proofmark of sorts.

Kind Regards,

Raimey
rse

This is interesting, Big Redneck's link above seems to show a crown M as a military mark, not commercial at all.I initially wondered if the M was a W mistakenly applied upside down.
Big Redneck, if your gunshop doesn't have cerrosafe, you can likely find it at Brownell's.
Mike

I made my share of chamber casts without cerrosafe or any such fancy stuff - just the nearest old candle. Accurate enough for this purpose, at least in my experience.

With kind regards,
Jani

Candle wax is not nearly as accurate as cerrosafe, but Jani is correct in that the difference between probable cartridges is enough that wax will show it. Just understand you have to be a little more careful in measuring it, and it may not be as useful as a reference,if it gets warm and sags.It's cheaper though, and avaliable.
Mike

To be honest, the only need for Cerrosafe is if you are shipping it to have a set of dies cast. Wax is much easier.

Kind Regards,

Raimey
rse

Gentlemen, just got a digital caliper. The diameter of the rim is 13.3 mm or .525 inches and the thickness, breech toward the muzzle, is 2mm. The diameter of the brass looks to be around 11.8mm, I will be able to get a better reading after I get the cast made.

Looks like is a little larger than a .45 Colt, tomorrow I will check a Colt round, I know it isn't the right cal., just to see how close it fits. My book shows a Colt round , the rim, at .512 inches.

I take it that you plug the barrel then pour in the melted wax, let it cool then push it out to get a measurement? This is all new to me, I'll have to check out the you tube video.

Yes, lube the tube a bit & let it cool and tamp it out with something.

Kind Regards,

Raimey
rse

Big, a chamber cast is really easy to do and especially on a break action firearm where you can remove the barrels.

For the last 25-30 years I've always used Cerrosafe but prior to that had used sulphur and it worked very well except that the cast is quite brittle. Easy to handle but bump or drop it and it's in pieces. Cheap drug store sulphur works fine and as with a crayon, wax or Cerrosafe can be repeatedly used....anyway...

Pull the barrels off the receiver. I use a piece of newspaper but anything would work. Shove it in the chamber and deep enough to get a couple inches of rifling, tamping the newspaper it so it is sort of solid. Melt a small amount of whatever it is you're going to use, obviously enough to fill the chamber. I use a little rectangular tin that the General Food International coffees used to come in, it's easy to bend a spout in one corner and control your pour. Pour it into the chamber until full enough that you can get a good casting of the rim depth, let cool and gently tap it out from the muzzle with a cleaning rod. Voila'! There's your cartridge.

Marc's contribution to the quest.

Kind Regards,

Raimey
rse

With the coarse measurements 64mm length, 13.3mm rim & 11.8mm base points toward 10,75X65R Collath.

Kind Regards,

Raimey
rse