Which model No 4 best for target work?

[Beerhunter]

A No.4T sans scope ought to be the best.

The Mk.2s trigger mechanism was to make manufacture easier (less skill and time required), not to improve the trigger.

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[vintage hunter]

not to improve the trigger.

As I understand it that is the purpose of the Mk.2 design, to improve trigger pull qualities by hanging it from the receiver where swelled woodwork doesn't affect the fit of the trigger/sear/cocking piece engagement surfaces causing inconsistent pull weights.