Evil Elvis Posted January 12, 2008 Report Share Posted January 12, 2008 LV just rang me and asked me if I had any 70mm carts,...i had 500 dianas kicking around(and they do kick!!!) so I said he could have them. Out of curiosity I measured them.....they are only 55mm despite saying they are 70mm on the box.....is the 70mm pre crimp size can anyone tell me?? Quote Link to comment Share on other sites More sharing options...
pin Posted January 12, 2008 Report Share Posted January 12, 2008 It's chamber size of gun they are meant for. Quote Link to comment Share on other sites More sharing options...
myuserid Posted January 12, 2008 Report Share Posted January 12, 2008 70mm will be the full length once fired. Mine are 55mm but say 67mm on box (and they are 67mm once fired ). Quote Link to comment Share on other sites More sharing options...
Hunter Posted January 12, 2008 Report Share Posted January 12, 2008 Just checked the carts in my safe. Biggest stuff I have is 76mm 50gms 12g should be good through the pump action sometime Quote Link to comment Share on other sites More sharing options...
Evil Elvis Posted January 12, 2008 Author Report Share Posted January 12, 2008 Pin, am i right in thinking that a 55mm then requires a 70mm chamber to "uncurl" properly as its fired? It just seems weird to label them as 70mm when they are in fact 55mm??? Quote Link to comment Share on other sites More sharing options...
Hunter Posted January 12, 2008 Report Share Posted January 12, 2008 well the crimp length is very important. If you fire a 3'' mag cartridge in a small chamber, you will have a serious problem. It would be less confusing if they gave just the fired length though Quote Link to comment Share on other sites More sharing options...
Evil Elvis Posted January 12, 2008 Author Report Share Posted January 12, 2008 That makes sense!!! Quote Link to comment Share on other sites More sharing options...
pin Posted January 12, 2008 Report Share Posted January 12, 2008 Pin, am i right in thinking that a 55mm then requires a 70mm chamber to "uncurl" properly as its fired? It just seems weird to label them as 70mm when they are in fact 55mm??? I'm not sure, all I know is I think I have seen carts expressed as the actual length, as well as a length which wasn't actually the size which I assumed pertained to the dimensions of the chamber in the gun. Quote Link to comment Share on other sites More sharing options...
SPARKIE Posted January 13, 2008 Report Share Posted January 13, 2008 asa few have said 70mm is the cart lenght when not crimped ie ya need a 70mm chamber or bigger to fire them or the crimp will have noware to open and it will be restricted into the bore and the wad will jam into the crimp and cause excess back pressure and probly blow the gun up .sparkie Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted January 13, 2008 Report Share Posted January 13, 2008 (edited) You can have 50mm shells that are only suitable in 70mm chambers; and you can have 70mm long shells that won't even cycle a semi-auto. It's all down to powder and shot quantities and the PRESSURE generated. Years ago, (1973ish) when the Eley factory blew up, all sorts of shells were imported; one of which was a little paper-cased devil called 'HK-27'. These vicious little fellows would cycle a Browning long recoil A-5 and they were only 53mm long!! Always look for 'Suitable for use in guns with xy mm only' - and go by that. Edited January 13, 2008 by Floating Chamber Quote Link to comment Share on other sites More sharing options...
Lord Geordie Posted January 13, 2008 Report Share Posted January 13, 2008 (edited) Just checked the carts in my safe. Biggest stuff I have is 76mm 50gms 12g B) should be good through the pump action sometime :o 50g? Kiddy stuff Try the 66g 3.5 inch magnum rattlers Edited January 13, 2008 by Lord Geordie Quote Link to comment Share on other sites More sharing options...
Hunter Posted January 13, 2008 Report Share Posted January 13, 2008 B) :o Hmm I think I prefer my shoulders in their sockets. Quote Link to comment Share on other sites More sharing options...
Suffolk shooter Posted January 13, 2008 Report Share Posted January 13, 2008 B) Hmm I think I prefer my shoulders in their sockets. Be fine through a semi auto though. :o SS Quote Link to comment Share on other sites More sharing options...
pin Posted January 13, 2008 Report Share Posted January 13, 2008 I've fired shells that size and can't say it was as bad as I'd been lead to believe.. Quote Link to comment Share on other sites More sharing options...
Floating Chamber Posted January 13, 2008 Report Share Posted January 13, 2008 Just checked the carts in my safe. Biggest stuff I have is 76mm 50gms 12g B) should be good through the pump action sometime :o 50g? Kiddy stuff Try the 66g 3.5 inch magnum rattlers Shouldn't you be saying 'AMALGAM RATTLERS'? Quote Link to comment Share on other sites More sharing options...
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