Winchester Shotguns - Model 37 for sale - Guns International

37winWinning Percentage Formulas. When you calculate a winning percentage, you are essentially approximating a ratio of wins versus total attempts. If there were no draws, you simply divideFor sale is a Winchester Model 37 single shot shotgun in 16 gauge. Serial number- NA. This Model 37 is in good condition and features a 30 barrel with a 2 34 chamber.