1. A convertible bolt action rifle, having a chamber receiving a shell casing, the shell casing having a flange, and having a rifle barrel with a bore, the rifle comprising: a receiver defining a bolt slideway opening on the chamber and bore of said rifle barrel at one end and being open at the other end, the receiver and barrel being mounted in a rifle stock; a bolt assembly including bolt body portion slidably and releasably mounted in the receiver for movement in the slideway; a firing pin mechanism within the bolt body portion and a hammer and trigger assembly associated with the firing pin; the bolt body portion having a first end abutting the rifle barrel in closed position and having a second end; an actuating bolt handle secured reversibly to the second end of the bolt body portion; spring biased shell extractor means on the first end of the bolt to withdraw the casing of an expended shell from the chamber of the barrel; and an ejector including an upstandng lug reversibly mounted in said receiver with the lug projecting into the slideway to eject the casing upon rearward movement of the bolt body portion.

5. A convertible bolt action rifle, having a chamber receiving a shell casing, the shell casing having a flange, and having a rifle barrel with a bore, the rifle comprising: a receiver including a base, sides, an upper portion and ends; the receiver defining a bolt slideway and one of said ends opening on the chamber and bore of said rifle barrel, the other of said ends being open; a rifle stock, the receiver and the barrel being mounted therein; a bolt assembly including a bolt with a bolt body portion slidably and releasably mounted in the slideway of said receiver; the bolt body portion having a first end abutting the rifle barrel at said chamber in closed position, and having a second end extending through and outwardly of the other said end of the receiver; the second end of the bolt having a coaxial, threaded opening formed therein; a bolt actuating handle comprising an annular sleeve, a curved stem and a knob, the sleeve having an opening aligned with the threaded opening of the bolt body portion; a screw having a threaded shank extended through the sleeve opening and engaged in the threaded opening and having a head retaining the sleeve against the bolt, the actuating handle being reversible; the bolt body portion including a forward end section with a flat lower surface, said forward end section having a pair of spaced apart, parallel, off-center slots formed therein extending longitudinally; a pair of spring urged extractors pivotally secured to the forward end section of the bolt, each having a tooth to grip the flange of a shell casing to withdraw said casing from the chamber upon rearward movement of the bolt; an ejector comprising a foot element secured to the base of the receiver and an upstanding, longitudinal off-center lug; and said foot element being reversible in position to extend said lug into a selected one of said slots in the forward section of the bolt.