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Thread: Indexing and Knurling Bullets

  1. #1

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    Default Indexing and Knurling Bullets

    Some may question the validity of these 2-principals and will let the reader decide after reading what I express.

    The principal here is getting the best 2-land coverage on each sabot petal. Consider this, the pressure from the lands is what provides the grip of the bullet through the sabot. This also suggests that only 50% of the bore provides sabot/bullet grip. I believe the reader knows where Iím going with this.
    To simplify loading in the proper orientation I use a pop mark on the crown that allows me to quickly align the sabot. Just align a petal split to the pop mark and away I go.

    So, what does knurling do? For me it produces a desired bore fit with a load resistance of 20lbs or slightly better. The best way I can describe the fit is one hand just doable or 2-hand with a palm saver is much easier. In case anyone is wondering how I get my load resistance measurement I made a little device working on the principle of spring compression.

    Compact and works reasonably well.
    Knurling provides a bullet surface that interlocks with the sabot. There can be no separate movement of bullet or sabot with the right compression fit. If you are already using a tight fit bullet/sabot load there may not be any real gain with knurling.

    What I try to produce is a loading consistency and let the powder burn do the rest. Then itís just being sure Iím on the sweet spot.

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  3. #2
    Borderline Spammer

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    Neat tool! Sounds very detailed. While I admit to loving to load for accuracy with my rifles, the muzzloader is like another rifled shotgun to me. I pop 2 triple 7's down the barrel and jam a bullet in. Groups still seem to hover around 1.5 inches at 100 depending on how still I can sit. Good enough for the girls I go with!

  4. #3

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    Hey Diverduck

    If you are getting 1-1/2” group at a 100yds that’s still a respectable group. If you’re content with that, then don’t change anything. I’m one of those that has to explore boundaries to see what I can get for more accuracy with my SML.
    Good hunting this season.

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