Looks like the issue is sorted thanks to @Fssprecision,
The issue pretty much came down to general wear on the rifle, have had the hammer built up with weld so that it interfaces with the bolt and is working as it should now (along with a deep clean)
seemingly the reason it works with the stock off is that it allows you to squeeze the tangs in and engage the trigger deeper, however with the stock on the tangs are held at their correct distance apart which stops the bolt pushing the hammer down enough to cock it.
Looking forward to having the rifle back in hand and getting some black powder through it.
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