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I prefer Jones underlever hammer guns. Have a 450-3 1/4" and a 577 2 3/4". A 4140 rifle barrel at 30-32 rockwell has been hardend and tempered. Consulting my Ryerson alloy steel reference book,I find the following 4140 information. 1 inch diameter bar. Quench 1500 to 1550 F. Temper 1000 F. 37 RC Temper 1200 F. 27 Rc Dave |