If you are tightening a screw and twist the head off,either you have a poor quality/defective screw,or you have grossly overtorqued it.Why?
If you are loosening a screw and excessive torque is required,at least stop and give some penetrating oil a chance.Have a cup of coffee.Look,think,figure out why.
OK,if the screw is seized and essentially welded in place,its going to break anyway.Then you have a tedious job to do in the mill.You have not yet scratched the receiver.
If you are pushing in on a screwdriver and it breaks,a hard,jagged,sharp broken end is headed for the blue or color case.Ugly!!
I do not want a screwdriver blade to break,period.That "break off tip"is a bogus idea,IMO.
Yes,fit your screwdrivers.And,some good tool mechanic screwdrivers can be ground to fit. Snapons,old Craftsman,S-K,,etc can be OK.No,you do not have to alter the temper if you know what you are doing.First,lose the weld shop grey grinding wheel and put on a surface grinder wheel.Works good on drills and lathe bits,too.Use a light touch for a short time.Hand finish them .
I did not do it,but I saw a color cased Meacham Hi-Wall with a scratch on the side of the receiver.What do you do? In this case,it was not a screwdriver,but,what do you do?
I'd rather make a new screw than deal with a gouged part from a brittle screwdriver.