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Thread: Polygonal rifling!

  1. 05-09-2024, 10:33 PM #21
    gunfan2
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    Thanks for all the replies, I appreciate the info! I know the Hi-tek coated 230 grain TC bullets shoot extremely accurate through that H&K 45 CT.
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  2. 05-10-2024, 09:34 PM #22
    charlie b
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    The problem I have with my HK VP9 is not the rifling. There is no throat. The sharp edges of the rifling 'shave' off a bit of the bullet and makes for poor accuracy. Jacketed works well. I suspect if it was properly throated it would shoot cast very well.

    Unfortunately HK also 'nitrides' the barrel so using a throating reamer is 'difficult'.

    Maybe they put a decent throat on the .45 barrels?
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  3. 05-13-2024, 11:31 AM #23
    JiriK
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    Quote Originally Posted by charlie b View Post
    The problem I have with my HK VP9 is not the rifling. There is no throat. The sharp edges of the rifling 'shave' off a bit of the bullet and makes for poor accuracy. Jacketed works well. I suspect if it was properly throated it would shoot cast very well.

    Unfortunately HK also 'nitrides' the barrel so using a throating reamer is 'difficult'.

    Maybe they put a decent throat on the .45 barrels?
    I kind a ordered HK SFP9 OR already. I guess it is same as VP9.
    That is bad news. Does PDP do better with cast bullets?
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  4. 05-13-2024, 09:13 PM #24
    charlie b
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    Don't know. From what I have read from others the VP9 might do ok with lubed cast bullets. I PC all of my pistol bullets and I suspect the sharp edge to the rifling is scraping the coating.

    Every now and then someone reports a buildup of lead at the mouth of the chamber. Others with similar barrels don't report problems. From what I have seen lately many mfgs are not throating their semi-auto barrels.
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  5. 05-14-2024, 09:10 AM #25
    Sasquatch-1
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    Quote Originally Posted by JiriK View Post
    Does PDP do better with cast bullets?
    I am guessing you mean the Walther. I have no direct experience with the PDP, but I have owned a PPQ for about 6 or 7 years. I am guessing the barrels are very similar. I have never experienced any lead build up problems with it. When shooting it I generally run from 50 to 150 rounds through it.
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  6. 05-15-2024, 07:41 AM #26
    ioon44
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    The PDP & PPQ have the same Polygonal rifling.
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  7. 05-15-2024, 05:29 PM #27
    charlie b
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    Just to clarify, the poly rifling is not the problem, it is the lack of throat. Some get them to shoot ok. I have not.
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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