The rifles barrel will allow the...
plastic sabot to grip and spin the enitre sabot/bullet assembly, as it travels down the barrel.
A lead slug (Foster or Brenneke) will pass thru BUT no improvement in accuracy.
A smoothbore barrel is best with the foster / brenneke styles.
With tightening restrictions on lead in bullets you may want the rifles barrel, then the homogeneous non-lead bullets can be handled aand you get better accuracy with more range.
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