quentyn Posted June 30, 2017 Report Share Posted June 30, 2017 Hi I have a new 590 mariner, took it to the range today to have some initial fun and 6 shots in the pump jams. Anyway it was a quiet day so I could just stop and strip it to see what was going on and it seems that the Gamebore kent 12g cartridges were jamming ie when I got the barrel off i found the shell still in the bolt claws when I tried it again the shell ejected with some issues but the brass was torn as per the attached pic. I was about to drive back to the shop and someone suggest i just try some other cartridges so i bought some lyvale 21g cheapies and tied them and 75 of them cycled fine i didnt know that pumps could be cartridge sensitive - has anyone seen this before ? will the shot gun run in and behave ? on an unrelated note i managed 16-17/25 with the pump and then 20-21/25 when i swapped back to my Beretta Quote Link to comment Share on other sites More sharing options...
saddler Posted June 30, 2017 Report Share Posted June 30, 2017 Yes. Any gun can be cartridge sensitive. Most function issues can be put down to the ammunition or the magazine. Just try a few brands to see what works. One reason I like the MEC Sizemaster is that you can adjust the case head brass diameter, as some commercial brands run to the max.allowed CIP size. Look up online for breaking in & tuning tips for pumps. Quote Link to comment Share on other sites More sharing options...
B391 Posted June 30, 2017 Report Share Posted June 30, 2017 My son's Mossy pump jammed and we worked out of did not like 67mm carts so we just make sure is runs with 70mm carts of whatever make happens to be cheap when he's buying. Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 30, 2017 Report Share Posted June 30, 2017 Yes .mine and my mates mossy 500 20b .dont like layvale carts thinkbits the cheaper brass .they tend to get stuck in the barrel and wont extract for a couple of seconds . No issues with gamebore .nsi .eley . Oh and hulls also get stuck . So i just dont buy those anymore . Quote Link to comment Share on other sites More sharing options...
Wingman Posted July 1, 2017 Report Share Posted July 1, 2017 My 600AT doesn't cycle anything under 70mm reliably. But haven't had cycling problems with any 70mm carts (yet anyway!) Quote Link to comment Share on other sites More sharing options...
Northerner Posted July 1, 2017 Report Share Posted July 1, 2017 On the other hand my 600AT cycles 65mm lyalvale cartridges no problem. Quote Link to comment Share on other sites More sharing options...
quentyn Posted July 1, 2017 Author Report Share Posted July 1, 2017 On the other hand my 600AT cycles 65mm lyalvale cartridges no problem. same here with the odd one dropping through the loading gate if you don't pump fast enough Yes .mine and my mates mossy 500 20b .dont like layvale carts thinkbits the cheaper brass .they tend to get stuck in the barrel and wont extract for a couple of seconds . No issues with gamebore .nsi .eley . Oh and hulls also get stuck . So i just dont buy those anymore . well the game bore kents were 155 a thousand they work fine in my beretta i will just have to keep to the fiocchi TT's in the mossberg Quote Link to comment Share on other sites More sharing options...
Caravanman Posted July 1, 2017 Report Share Posted July 1, 2017 (edited) My Sxp doesn't like Gamebores cheaper cartridges! Edited July 1, 2017 by Caravanman Quote Link to comment Share on other sites More sharing options...
mossy835 Posted July 2, 2017 Report Share Posted July 2, 2017 i have a pump and semi,and put 70mm carts in them and never have a jam. Quote Link to comment Share on other sites More sharing options...
quentyn Posted July 2, 2017 Author Report Share Posted July 2, 2017 OK so this is the exact same issue when you google mossberg 590 jamming its always the Mariner.... ( is it the coating? ) I spent a really frustrating hour at the range today, but I think i know what the issue is. The gun only seems to cycle 65mm carts reliably ( occasionally one drops through the loading gate) which is not great ( 67 and 70mm jam) . If you take a fired cartridge case and load it, fire and then try to eject... no joy. Its like the fired cartridges are jamming in the breech I really like this gun, i really want to keep this gun but so far its less reliable then my old Hatsan escort ( which only misfed once every 100-150 shells) Quote Link to comment Share on other sites More sharing options...
Wingman Posted July 2, 2017 Report Share Posted July 2, 2017 (edited) You need to rack it really hard when using shells less than 70mm, well that's the case with my 600AT anyway. Edited July 2, 2017 by Wingman Quote Link to comment Share on other sites More sharing options...
saddler Posted July 2, 2017 Report Share Posted July 2, 2017 OK so this is the exact same issue when you google mossberg 590 jamming its always the Mariner.... ( is it the coating? ) I spent a really frustrating hour at the range today, but I think i know what the issue is. The gun only seems to cycle 65mm carts reliably ( occasionally one drops through the loading gate) which is not great ( 67 and 70mm jam) . If you take a fired cartridge case and load it, fire and then try to eject... no joy. Its like the fired cartridges are jamming in the breech I really like this gun, i really want to keep this gun but so far its less reliable then my old Hatsan escort ( which only misfed once every 100-150 shells) Action bars maybe? Thought the barrel change may fix it on the above clip. A similar problem seems to occur on some of the more budget end Rem 870's that are sold in the US The fix there? Take a wooden dowel, a drill & some very fine steel wool. Cut a slot in the dowel to allow the steel wool to be nipped in place then wrapped around it, candy-floss style. Insert this into the drill - then polish the chamber If it doesn't work you've wasted a piece of dowel, some steel wool & ten minutes of your time. Quote Link to comment Share on other sites More sharing options...
quentyn Posted July 2, 2017 Author Report Share Posted July 2, 2017 Action bars maybe? Thought the barrel change may fix it on the above clip. A similar problem seems to occur on some of the more budget end Rem 870's that are sold in the US The fix there? Take a wooden dowel, a drill & some very fine steel wool. Cut a slot in the dowel to allow the steel wool to be nipped in place then wrapped around it, candy-floss style. Insert this into the drill - then polish the chamber If it doesn't work you've wasted a piece of dowel, some steel wool & ten minutes of your time. well the chamber has been polished, i put steel wool around may jag and spun it with a drill just annoying I cant test till next weekend Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted July 4, 2017 Report Share Posted July 4, 2017 Watched the vid . It looks similar to what mine did with the wrong carts except that mine would jam if i tried to rack it fast .if i slowed down and waited a second then it would extract just fine .with layvale carts . With any gamebore or nsi .it extracts at any speed of rack .and i do rack the gun fast . I just by carts that work . I belive its the carts brass expanding into the barrel and sticking . Ps no amount of polish or lube helped me . Quote Link to comment Share on other sites More sharing options...
quentyn Posted July 4, 2017 Author Report Share Posted July 4, 2017 Ps no amount of polish or lube helped me . hmm this is what worries me, i have take cartridges that this gun has fired and have manually put them in the breech and since polishing they still stick Sat i will go fire it for the 1st time since the polish and see if its has cured the issue Quote Link to comment Share on other sites More sharing options...
psycho Posted July 5, 2017 Report Share Posted July 5, 2017 My mossberg 500 will jam if it fires 7 size shot eley cartridges. If I use size 6 it is faultless.I think literally the 7 shot burn hotter and so the plastic welds itself in the barral..it fires 2,2.5 and 3 inch cartridges faultlessly of eley put in a 7 and it jams to such an extent. I have to strip it and Force the empty cartridge from the barral...so I only use size 6. Quote Link to comment Share on other sites More sharing options...
Wingman Posted July 5, 2017 Report Share Posted July 5, 2017 My mossberg 500 will jam if it fires 7 size shot eley cartridges. If I use size 6 it is faultless.I think literally the 7 shot burn hotter and so the plastic welds itself in the barral..it fires 2,2.5 and 3 inch cartridges faultlessly of eley put in a 7 and it jams to such an extent. I have to strip it and Force the empty cartridge from the barral...so I only use size 6. Thats just plain strange, I cant see how shot size can affect cycling. What happens if you use fibre wad 7 Eley's? Quote Link to comment Share on other sites More sharing options...
saddler Posted July 5, 2017 Report Share Posted July 5, 2017 I belive its the carts brass expanding into the barrel and sticking Strange thing to believe! How far down the plastic case is the brass? That'd be some expansion going on!! If the chamber polish isn't a cure then back to basics & try as many makes & lengths of cartridges as you can Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted July 5, 2017 Report Share Posted July 5, 2017 Mine is more reliable with the longer brass carts so 16 mm ideally or 12 mm at a push .but if i use say an 8mm brass on a 30 grm load it sticks in the barrel .lighter loads are ok with shorter brass so a 24 grm for example Ps my mates 20b mossy is the same .if not quite as tempremental Quote Link to comment Share on other sites More sharing options...
psycho Posted July 5, 2017 Report Share Posted July 5, 2017 Thats just plain strange, I cant see how shot size can affect cycling. What happens if you use fibre wad 7 Eley's? That is using fibre the end of the cartridges melt in the gun and come out as if they have had a blow torch on them.....mine is a 410 Quote Link to comment Share on other sites More sharing options...
impala59 Posted July 5, 2017 Report Share Posted July 5, 2017 Seems like a similar problem I have had with all my Ithaca 37's, in my opinion the European low 'brass' cartridges are simply not compatible with American hook type extractors. The metal is too thin and weak and the rim profile either lets the extractor ride over or tear through. Of course on your S x S or O/U the extractor wraps around a sizable portion of the rim. Coupled with expanding plastic (due to low 'brass') which grabs the chamber. Polishing (and keeping polished) the chamber does help a little but in my experience finding a high (10mm +) 'brass', decent quality cartridge is the only real solution. My choice is the Bornaghi brand which has more substantial metal and also seems to have a more suitable rim profile. Certainly all my problems seem to have gone away (and the 37's are notoriously fussy guns where cartridge choice is concerned) It is interesting to note that my Browning BPS (made in Japan by Miroku) cycles anything and likewise did an old Fabarm (Italian) and Escort (Turkish) Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted July 5, 2017 Report Share Posted July 5, 2017 Thats interesting . I never thought about actually being the plastic case melting a bit and getting stuck in the barrel . Makes sense .and i guess a hot cart and short brass would cause this . Quote Link to comment Share on other sites More sharing options...
Wingman Posted July 5, 2017 Report Share Posted July 5, 2017 But would it really weld itself so hard to cause a misfeed? Not convinced tbh Quote Link to comment Share on other sites More sharing options...
quentyn Posted July 5, 2017 Author Report Share Posted July 5, 2017 But would it really weld itself so hard to cause a misfeed? Not convinced tbh nor me see the pics at the top they were all from shells that wouldn't eject - had to remove the barrel to get the shell out. There wasnt any sign of the cartridge being melted. They were bigger then before they were shot as an unfired cartridge drops cleanly into the chamber where as a fired one doesnt. I need to check if my Beretta's have the same "issue" with a fired cartridge. Actually come to think of it - if a fired cartridge wont fit into the chamber is the chamber over sized ? ie it is allowing too much expansion ? you can reload cartridge but my Mossberg certainly cant fire a reloaded cartridge as the cartridge doesn't physically fit any more into the chamber thoughts ? Quote Link to comment Share on other sites More sharing options...
Paul1440 Posted July 5, 2017 Report Share Posted July 5, 2017 A tip i've read it to apply a smear of oil around the crimp end of the first a couple of shells go be fired. Aparrently this can help solve this type of issue. Quote Link to comment Share on other sites More sharing options...
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