I have a BSA no 4 T. I reload my own ammo and every now and then when the rifle is fired the hammer will not go all the way forward and the cocking handle has fallen only half way and the round fails to fire. It seems a final sqeeze on the trigger and it will fire Somestimes not.

The bolt is a replacement with the original bolt head on it.

Does this sound like a hammer or spring or trigger grouping problem?
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