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Canon Polygonal VS canon traditionnel <Polygonal rifling VS traditional rifling>

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  • Canon Polygonal VS canon traditionnel <Polygonal rifling VS traditional rifling>

    Une discussion intéressante...Petit topic, car je n'y connais rien la dedans, si plusieurs spécialistes pouvaient nous en dire plus ?
    Genre avantages et inconvénients...

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    An interesting discussion...A little topic, because I don't know anything about it, if several specialists could tell us more about it?
    Types of advantages and disadvantages....

  • #2
    Je vais tenter d inviter shilen a participer a ce sujet . Rien de garantie mais on va essayer

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    • #3
      En fait, ma question n'est pas innocente....
      De fait, ma nouvelle stiller possède ce type de canon, appelé "octagon", profile R5. Ce n'est pas tout a fait nouveau, ce type de canon remonte... au 18eme siècle.
      Les différences sont: moins de frottements, vitesse accrue et moins de sensibilité au vent ainsi qu'un entretien plus facile. Du marketing ?

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      • #4
        La mienne aussi

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        • #5
          Originally posted by sfurax View Post
          La mienne aussi
          Bin oui je sais. C'est un R0 ou un R5?
          Le contour.

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          • #6
            C est un R5

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            • #7
              Originally posted by sfurax View Post
              C est un R5
              Il est un peu plus fin que le R0, et on le rattrape mieux au tuner.
              Les "match selected" sont différents des "match" avec 0.001 de tolérance comparé au 0.003" des matchs. Les "match selected" sont finis à la main (hand lapped)

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              • #8
                merci pour ces infos

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                • #9
                  From experts (US) polygonal are less prone to wind, because it doesn't create right angles on the bullet.

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                  • #10
                    Originally posted by PedroS View Post
                    From experts (US) polygonal are less prone to wind, because it doesn't create right angles on the bullet.
                    Pedros, did you shoot (or are shooting ) with this kind of Barrel?

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                    • #11
                      Only shoot polygonal in air rifle. They are great.

                      On rimfire, had shot one but shortly and it felt good and strong. But not enough bullets through it, so no definitive opinion.
                      From my US friends polygonal (octagon) due to its very low riffling are best for indoors, ratchet ones for outdoors.

                      Captura de ecrã 2019-03-22, às 23.34.09.png

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                      • #12
                        Pedros, you had a shilen ratchet in your video, this is a polygonal barrel, correct ?
                        It is 4 grooves, making an octogonal profile? They call this barrel (R0 or R5) the "octagon" reference?
                        Anyway, The rimfire benchrest guys swear by them in US...
                        Last edited by ICEMAN; 03-23-2019, 06:53 AM.

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                        • #13
                          ICEMAN, maybe we are talking about the same but with different nomenclature.

                          Below, on the right, the Shilen ratchet 4 grooves (majority of my barrels). I do like this riffling a lot. If you look closely it shows a gentle steep against the wind, That's why they are so good outdoors...
                          ratchetRifle.gif
                          In fact it can be called polygonal, but the "true" polygonal don't have so steep angles.
                          Also, the called octagon, also have the grooves less pronounced (see my previous post). But again yes, it has "8 sides", so octagon...
                          Yep, they swear on octagon's ones, namely the Broughton (I have one of these to be prepared for my next sporter along with a ratchet Shilen). Then I'll have time and enough bullets to compare

                          If you succeed to correctly slug your barrel, you'll have a pretty good picture of what type of rifling it has.

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                          • #14
                            Thank you PedroS. What do you really mean by "correctly slug your barrel" ?
                            Really impatient to get this new competition rifle with the shilen ratchet. They are currently under assembling, may be next month ?
                            Last edited by ICEMAN; 03-23-2019, 03:01 PM.

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                            • #15
                              As you know slug is going through the barrel with a lead bullet.
                              Not always easy done to understand the riffling, as lead is plastic and any deforming force will show later, but not impossible.

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