I wonder if anyone would be able to tell me what the minimum trigger pull weight was allowed to be, in the old NRA full bore competitions in Australiaicon?

I have a 1945 Lithgow, in full target trim (Heavy barrel ,Central sights, target swivels etc), which a previous owner seems to have done some trigger improvements on. It has a beautiful, single stage, one-half-pound trigger pull. In the course of the modifications, the cocking piece has been shortened to such an extent that the safety will not engage as the groove no longer lines up when the action is cocked.

This all seems a bit unsafe to me, and would it have been "shoot legal" at the time?
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