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After speaking to John, I know the answer to my question:
Spitfire (and Firebird) barrels are modified Superten barrels.
They have a choke. This is necessary for accuracy, especially in .177.
BSA springer barrels do not have a choke.
In .22 and .25, this is probably less of a problem.
I have actually experienced this myself: a gunsmith once shortened my .177 Spitfire barrel, after which the gun grouped like a shotgun. I had to bin it and find another Spitfire barrel.
Atb, Louis
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