BSA .22 trainer problem

G'day, firstly I'd like to say how greatfull I am to everyone on milsurps, the wealth of information on here is second to none & has answered most of my questions without having to ask any so far.
I have had "Enfielditis" for a long time & recently added a lithgow .22 trainer & a BSA .22 trainer to the collection.
The lithgow works great, very happy with it but the BSA won't fire, it just dints the cartridge.
I swapped the bolts & the lithgow bolt works great in the BSA rifle & the BSA bolt does work in the lithgow rifle but not consistently , it still miss fires every second or third round.
I've noticed the spring tension in the lithgow bolt is a lot harder than the BSA bolt so do you think I need to replace the spring? And if so, is the spring the same as a standard .303 bolt spring? Or are the .22 trainer bolts set up differently? Or could it be something else that's causing the problem?
Thanks in advance to anyone that can help me out, cheers.

Have you stripped , cleaned , and re-oiled the bolt ? Sounds like it may be gunked up.
Chris

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Originally Posted by emmagee1917

Have you stripped , cleaned , and re-oiled the bolt ? Sounds like it may be gunked up.
Chris

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Not yet mate, I'll give that a go, the previous owner hasn't used it for 8 or 9 years & said it used to work fine. Maybe that's all it is.
Cheers. Hudz

Maybe he left it cocked for 8 or 9 years...?

Is the firing pin hitting the edge of the round? I had one that was not quite there and gave a hit and miss performance.
I cured it by drilling the firing pin hole out a fraction and turning up a slightly larger diameter pin, great old girl now.

Thanks for the input gents, found the issue & am currently sorting it out, cheers.

Well, what was it?

The pin itself was either worn or swapped out with another pin.
The rear of the pin was falling too far into the bolt head and hardly hitting the rim of the case.
Tried it with a pin that was slightly longer and worked perfect.
I've got another pin on its way to me but a mate is going to turn me up a couple of pins as well.
Cheers.