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Thread: Multi-radial Rifling

  1. #1
    Boolit Master

    Join Date
    Feb 2018

    Multi-radial Rifling

    Has there been any new experience or thoughts on this type of rifling for long guns? Seems like itís nothing really new, but Sabatti seems to trying hard to sell it. How about shooting cast?

  2. #2
    Boolit Master
    Join Date
    May 2016
    Denmark (a greasy little spot in Scandinavia)
    So it's nothing more than a Metford or Rasmussen rifling used in black powder rifles in the late 1880's?
    Or in other words a polygon rifling of yesterday.

    I'll buy it when the benchrest shooters start setting records with it.
    Until then, meh!

  3. #3
    Boolit Master

    Join Date
    Feb 2018
    They don’t seem to be popular. Today was the first time I’ve heard of it.

  4. #4
    Boolit Grand Master Texas by God's Avatar
    Join Date
    Mar 2016
    H&K SL rifles had polygonal rifling and didn't impress accuracy wise.

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  5. #5
    Boolit Master
    Join Date
    Nov 2017
    brisbane ,qld,australia
    Millenials gotta have new,aint new, wont buy......I m old,and I dont like silly names for rifling,three lug bolts,spiral grooved bolts,big diameter bolts with 3 lugs and spiral grooves,and particularly dont like string wound barrels.......did I mention I dont like plastic at all.......but metal skeleton stocks .....them I hate.

  6. #6
    Boolit Master TNsailorman's Avatar
    Join Date
    Dec 2006
    Northeast Tennessee Hills
    We have to have new and exotic names for everything old these days. Sign of the times and the state of advertising of the modern world. The next generation will change names and attitudes also. Newness sells now and the perception of it did in the old days too.

  7. #7
    Boolit Buddy
    Join Date
    Jan 2007
    Low country, SC
    Remember that we stand on the shoulders of giants.

    When Metford rifling came out - it was better than anything else tested....
    It entered the field in the 1860's when rifling was sort of in it's infancy.

    Look at the old "rifled" bore patterns.... Squares, octagons, weird heart shapes, etc.... Custom rifle makers supplied bullet molds individually custom fit for the barrels. Military rifles used thick patches to make up for big gaps between the barrels and bullets... The stuff we think of now as "Ballard rifling" back then was extremely deep and it seriously deformed the bullets. It was nothing special to see rifling on a 58 caliber run more than 1/16" deep per side.... Now rifling runs 0.006" to 0.012" deep per side....

    Then you have the issue of Military rifles battlefield usage means that you don't have time to carefully treat or clean the bore between shots or maybe not even between engagements.... You fought till the fight was over and then you marched off to the next place.

    Rifling has come a LONG LONG way since even the 1940's. Look at most modern rifles vs old rifles and you will be struck by how much smaller and shallower the rifling lands are now. They are akin to Marlin's "Microgroove" rifling just with fewer lands...

    Then - in modern guns - deeper rifling and weird polygon rifling is typically found in military arms. They aren't more accurate - they sustain higher rates of fire before the rifling is worn away.... For example - the US military tested Marlin's microgroove rifling in the 1960's and found that barrel life was shorter in combat/high volume of fire situations. That's simply not a problem in a lever action or a 22lr.....

    As such - it's hard for me to get excited about going back and rehashing that stuff.

  8. #8
    Boolit Master

    Join Date
    Mar 2005
    NW Ohio, almost as N and W as you can be :-)
    One aspect of polygon rifling may be the method of rifling being used in the first place by some mfg, IE hammer forging. Some rifling patterns may work better depending on the method being used. Are we cold hammer forging ?? Are we button rifling ?? Are we cut rifling with Pratt and Whitney rifling machine ?? Are we broaching rifling ??

    Harry Pope is reported to have "rifled" a 22lr barrel with a piece of sandpaper mounted onto his rifling head, it was accurate until his "milli grooves" (spin on little tiny micro grooves) filled up with lead.

    Back before we had any rifled 12 gauge barrels readily avail I always wanted to try and lap rifling into an existing 12 gauge barrel using a cast iron lap rotated like a rifling head as it was pulled through the barrel, my bet is that it would work.

    Some of the rifling system like the Pope did not involve swaging a bullet into the rifling from a ctg through a leade/throat, the bullets were being muzzle loaded using a false muzzle. So some rifling patterns might make great rifling but lousy Leade and throat...IE they may burn out faster. I seem to recall the "ratchet" rifling suffered from issues of faster throat erosion ??

    Both ends WHAT a player

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check