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Ty i figured they did have any affect on the spin. i would like to find a way to make them spin without a rifled barrel.
Experamenting time
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How on earth do you figure to do that?
There are all manner of slugs designed to do most anything you want. You don't have to reinvent the wheel. The Foster or Brenneke slugs works on the "bad minton birdy" principle. Weigh forward keeps it flying straight.
The Federal TruBall is twice as accurate, on average, as the standard slug. It utilizes a polymer ball at the rear to expand the slug and make it fill the bore and provide a seal.
For more accuracy, the rifled bbl. and Sabot slugs are the set up.
You're not going to gain any accuracy by trying to get a Foster slug to spin even in a rifled bbl.