impala59 Posted March 11, 2019 Report Share Posted March 11, 2019 I will shortly be starting to reload for my 10g Ithaca Mag 10 and my 1911 10g Ithaca Flues Double. The Flues was, I believe, originally chambered for 2 5/8" cartridges but has a UK Birmingham proof mark of 76mm. To ascertain the actual chamber size, my research has led me to the above named product, Cerrosafe. I would be grateful for any experience you have with this product, or any other foolproof ways of measuring the chamber size accurately. The Mag 10 is not an issue as it is 3 1/2" chambered. I will be using a roll crimp for both loads Quote Link to comment Share on other sites More sharing options...
moondoggy Posted March 12, 2019 Report Share Posted March 12, 2019 I have some Cerrobend. We used to use it at work for bending thin walled metal tubing. It melts in nearly boiling water. Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted March 12, 2019 Report Share Posted March 12, 2019 Do you intend to make a mould of the chamber to measure where the forcing cone starts? Quote Link to comment Share on other sites More sharing options...
impala59 Posted March 12, 2019 Author Report Share Posted March 12, 2019 Yes, it’s just a precaution really, the cases I ordered are all 3 1/2” so for my old Flues I will have to cut to fit. With a little time to consider this, I will be able to insert the new(long) cases into the breech until they reach the chamber end and then measure the cut I need at the back end. The chamber casting idea came from a Midway video I was watching. Just have to wait for my cases I guess. Unless you have a better idea?🙂👍💡 Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted March 12, 2019 Report Share Posted March 12, 2019 Well, I would probe the side of the chambers with a parallel sided steel rod and feel for the start of the forcing cone, that would allow you to measure the hidden portion of rod and be sure. Quote Link to comment Share on other sites More sharing options...
figgy Posted March 12, 2019 Report Share Posted March 12, 2019 You could plug the barrel in front of forcing cone and cast lead in the chamber, this would give you the length of chamber and forcing cone. Think I would go with tight choke and use a steel rule. Quick and simple. Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted March 12, 2019 Report Share Posted March 12, 2019 2 minutes ago, figgy said: You could plug the barrel in front of forcing cone and cast lead in the chamber, this would give you the length of chamber and forcing cone. Think I would go with tight choke and use a steel rule. Quick and simple. We like quick and simple! Quote Link to comment Share on other sites More sharing options...
figgy Posted March 12, 2019 Report Share Posted March 12, 2019 If it works no point complicating things. Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted March 12, 2019 Report Share Posted March 12, 2019 1 minute ago, figgy said: If it works no point complicating things. Unless you are a POLITICIAN! Quote Link to comment Share on other sites More sharing options...
panoma1 Posted March 12, 2019 Report Share Posted March 12, 2019 19 minutes ago, figgy said: You could plug the barrel in front of forcing cone and cast lead in the chamber, this would give you the length of chamber and forcing cone. Think I would go with tight choke and use a steel rule. Quick and simple. Years ago I did this (fibre wad in the barrel proper, in front of the forcing cone) used a wood dowell down the centre of the chamber to minimise the quantity of cerrosafe required, I used the resultant casting as a pattern for making 4 bore solid brass cases...........got the cerrosafe from France! Quote Link to comment Share on other sites More sharing options...
lancer425 Posted March 12, 2019 Report Share Posted March 12, 2019 (edited) Impala i admire your attitude to getting things right and doing a chamber casting will get you the measurement you need, but its not like its a small chamber and its not especialy long at 3 inch ish . So to save you the trouble of a casting could you not simply use a tail of any vernier and measure it to forcing cone. or try this. use a 16 instead of 20 inside and ten hull. . Edited March 12, 2019 by lancer425 Quote Link to comment Share on other sites More sharing options...
wymberley Posted March 12, 2019 Report Share Posted March 12, 2019 Telescopic bore gauge set and locked in the chamber and then measure the shaft when it comes to a halt in the cone. Also handy for measuring chokes assuming one has a mic or vernier. Quote Link to comment Share on other sites More sharing options...
impala59 Posted March 13, 2019 Author Report Share Posted March 13, 2019 Thanks one and all , when I get off this horrible shift pattern, I shall endeavour to try the simplest way first! Quote Link to comment Share on other sites More sharing options...
lancer425 Posted March 13, 2019 Report Share Posted March 13, 2019 Shifts are an invention of the devil himself, i hated them best thing i ever did packing in job with shifts. Quote Link to comment Share on other sites More sharing options...
Vince Green Posted March 17, 2019 Report Share Posted March 17, 2019 (edited) We have just pinched some of the kid's plasticine and pushed in a big plug when checking chambers in the past. The trade used to make a sulphur cast. Now I believe they use Vinamould Edited March 17, 2019 by Vince Green Quote Link to comment Share on other sites More sharing options...
panoma1 Posted March 17, 2019 Report Share Posted March 17, 2019 You could try plugging the bore proper (after the forcing cone) and melt candle wax/tallow into the blocked chamber, once set, push it out with a cleaning rod inserted from the muzzle? Quote Link to comment Share on other sites More sharing options...
simcgunner Posted March 17, 2019 Report Share Posted March 17, 2019 Your Flues will have 2 7/8 inch chambers if not altered. Chamber length can be measured with a steel rule, Or better with a chamber Gage. One can be made from a round wooden dowel turned down to loosely fit the diameter of chamber and marked at. 2 7/8 and 3 inch and 3 1/2 . Cerro safe not the best choice for shotgun chamber . It is fantastic for rifles in doubt of clambering. But a waste for shotguns. Quote Link to comment Share on other sites More sharing options...
DUNKS Posted March 18, 2019 Report Share Posted March 18, 2019 Think laterally. I have a plastic felt tip pen with a blunt end. "opposite to the inky bit" Which fits my 12g guns exactly. Push it in till it stops. Mark it, Then pull it out. I find my very old guns have a forcing cone almost like a step. Opposite to my new Browning with a three inch cone!!! Quote Link to comment Share on other sites More sharing options...
simcgunner Posted March 21, 2019 Report Share Posted March 21, 2019 (edited) My post on this subject has some incorrect information.. The Flues was meant to fire 2 !/5 inch Ammo and chambers were 2 5/8 inches to allow the expansion of the rolled crimp.. The gun was intended for low pressure ammo of the era and modern 2 1/5 inch exceeds the proof of the time. In The US low pressure 2 1/5 ammo is available and commonly used in classic old double guns.. The shotgun that replaced the Flues is the NID and that gun can handle higher pressure loads. The Flues action can crack through if modern CIP proofed loads are used Edited March 21, 2019 by simcgunner Quote Link to comment Share on other sites More sharing options...
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