Quote:
Originally Posted by Bruce Day
Then for those who know the recoil energy formula, which of these loads do you think will have the least recoil energy? One of the two 1 oz 1200 FPS loads or the Fed 1oz 1165 FPS load?
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Okay. I found a shooters recoil formula. Calculator is setup for rifles but it should calculate out the same. Had to convert grains to drams and ounces of powder and shot. I ounce of shot is 437.5 grains and 2.5 drams of powder is 68.36 grains of powder. Looking at Bruce's table for my 16 Gauge I used a 7lb weight for the gun. With these inputs it calculates out at 32.85 foot lbs for the federal load.
Since I/we don't know how much powder is used in the RST loads then its hard to calculate the differences. But its an interesting point. If the charges are all the same just put in 1200 fps for the RST loads and keep then recoil energy goes up to 34.4 lbs. Then the recoil energy is less for the Federals by 2 lbs, thereabout. That is only about 4.5% difference and maybe negligible due to certain vagaries.
For giggles went and calculated what an 8 pound 12 gauge would produce at 1200 fps, 3.5 drams 1 1/8 ounce load. That recoil is 45 lbs. That is a 28% increase. If gun frame is about the same on a 12 to 16 gauge Parker and assuming wood is about same thickness, that is about 10 or more extra pounds being exerted on the stock. That might be the difference in whether old american walnut splitting out, or not.
http://www.shooterscalculator.com/recoil-calculator.php