That’s what I thought he meant in the original post
Yeah thats right. Dummy round and fired round do the same thing. They both get stuck. The only way cases eject is when the trigger hasnt been pulled. Sorry for the confusion.
Strip and clean maybe? Inspect parts? 
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Is it possible that (1) the chamber is really dirty, or (2) its been rechambered and isn’t .310 cadet. I’m wondering if the firing pin hitting the primer/back of the dummy round is just enough force to push the case further forward into the chamber and thats why it’s only jamming when the trigger is pulled?
Re-barrel it in 357 that will fix it 
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The second option seems plausible, I remember there’s a thread on that here somewhere. Specifically about obscure rechambered Cadets. Will need to search for it…
I couldnt say for sure its not rechambered but its probably unlikely. The rifle used to belong to my grandpa and he said he brought it for $5 from a gunshop in Melbourne. I dont think he ever would have bothered with getting it rechambered but maybe it was done before he got hold of it. He also gave me some ammunition as well which was all . 310 cadet.
This is very cadet common, they are known for poor extraction. Check for obvious chamber roughness…failing that, keep your loads on the light side. AP70N is a good powder. AR2205 is great, but unburnt powder often results.
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Well after probably too long I have figured it out. It turns out that the cases are too long and are jaming in the chamber after the trigger is pulled. Thanks for everyones help and sugestions. Now I need to get a trimmer.
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Don’t forget a inside and outside deburring tool.
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And then spin with 400 grit paper around the case mouth…
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Thats what I would be trying first, they are so simple to strip …
310 cadets are sometimes a case of making/trimming cases to the individual chamber. I’m currently converting Statline 32-20 brass, because my rifle seems to hate Bertram…could be a simple chamber polish needed, though I believe.
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Update from another thread on a separate ejection issue below, just keeping stuff organised 
Yep. Bought loaded from Golden Flash in Maryborough.
Tapped straight out with a rod when I got home.
Since then, I’ve taken it apart and soaked it in solvent, cleaned and oiled the internals. See how it goes next time and bring the rod with me.
It wont be the rifle, odds on it will be the thin rim of the Bettram.brass, i believe…but i would have to see the rifle to tell. A lot of cadets suffer the se fate i think. When the rim is too thin, it allows the cartridge to move rearward, causing the case to wedge into the chamber. With a thicker rim, this wont happen. Im.of the belief, the only way to get a cadet running is to convert/tailor 32-20 brass to the individual rifle. Best thing i done.
Or give the chamber a damn good clean…or polish
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I must have shot 200 rounds by now (self loaded) of 310 using Bertram brass, no issues what so ever.
That’s not to say you are not right as well, @MaxJon, there’s certainly hit and miss QA going on there. I have a bunch of Bertram brass for various things… 455 Webley (@Nomis oh yes, I have one now) rim seemed to thin, but I took it up above milspec velocities with modern powder and it held up fine few firings, still going. The M1895 was absolute shit, a lot either split on FL sizing, or raptured on firing, rim too thick that caused cylinder jam. I ended up giving it all to someone for melting into different artisan projects. If anything, it was too thick… But 310 brass seems to be pretty good over a few firings now.
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Next time I want to play around I think I’ll disassemble it again and see if I can give the chamber an especially good clean.
Hopefully that, plus the cleaned internals will mean an alright extraction. If not, I’ll look into polishing the chamber if possible.
Could it be worn extractor that skips the rim? In which case, it’s not so much the brass, but if it was for argument sake, it’d be the diameter, not the thickness?
