Inline FabricationReloading EverythingRepackboxWideners
Snyders JerkyRotoMetals2Titan ReloadingMidSouth Shooters Supply
Load Data Lee Precision
Results 1 to 6 of 6

Thread: Use of Cup Points, Question

  1. 04-21-2019, 09:00 AM #1
    Boolseye
    Boolseye is offline
    Boolit Master
    Join Date
    Oct 2010
    Location
    VT
    Posts
    1,849

    Use of Cup Points, Question

    What are the main uses for cup points on cbs?
    I saw on a thread someone using them for high velocity rounds where a full HP in soft alloy might cause fragmentation, etc. I think it was in a 10 mm.
    Is this right, or are there other reasons for casting cup points?
    Regards,
    -BE


    Sent from my iPhone using Tapatalk
    Last edited by Boolseye; 04-21-2019 at 05:59 PM.
    Reply With Quote Reply With Quote
  2. 04-22-2019, 11:00 AM #2
    Boolseye
    Boolseye is offline
    Boolit Master
    Join Date
    Oct 2010
    Location
    VT
    Posts
    1,849
    Bump...anyone out there using cup points care to weigh in?


    Sent from my iPhone using Tapatalk
    Reply With Quote Reply With Quote
  3. 04-22-2019, 11:13 AM #3
    BK7saum
    BK7saum is offline
    Boolit Master
    Join Date
    Mar 2011
    Location
    oklahoma
    Posts
    2,488
    Cup points allow a bit more expansion than a WFN boolit. At higher velocities (i.e. magnum handgun) a cup point might be preferred over a WFN for a bit more expansion, but a deeper or wider hollowpoint would promote violent expansion and shedding of the petals, hollowpoint.

    It is just another option for balancing the alloy, velocity and boolit design to get the desired expansion. Nothing magic about it. Just another step between a WFN and a deep hollowpoint.
    Reply With Quote Reply With Quote
  4. 04-22-2019, 11:35 AM #4
    Outpost75
    Outpost75 is offline
    Boolit Grand Master Outpost75's Avatar
    Join Date
    May 2013
    Location
    over the hill, out in the woods and far away
    Posts
    10,169
    I use cup points to ensure low velocity expansion of soft alloys, while maintaining retained bullet weight, by avoiding fragmentation. The British Webley Mk III Manstopper bullet is the perfect example, 1:12 tin-lead, at 600 fps.

    Attachment 240246
    Last edited by Outpost75; 04-22-2019 at 12:21 PM.
    The ENEMY is listening.
    HE wants to know what YOU know.
    Keep it to yourself.
    Reply With Quote Reply With Quote
  5. 04-22-2019, 11:47 AM #5
    OS OK
    OS OK is offline
    Boolit Grand Master OS OK's Avatar
    Join Date
    Dec 2015
    Location
    El Dorado County, N. Ca.
    Posts
    6,234
    Quote Originally Posted by Outpost75 View Post
    I use cup points to ensure low velocity expansion of soft alloys at low velocity, while maintaining retained bullet weight, by avoiding fragmentation. The British Webley Mk III Manstopper bullet is the perfect example, 1:12 tin-lead, at 600 fps.


    Ditto...

    a m e r i c a n p r a v d a

    Be a Patriot . . . expose their lies!

    “In a time of deceit, telling the truth is a revolutionary act.” G. Orwell
    Reply With Quote Reply With Quote
  6. 04-22-2019, 12:17 PM #6
    Boolseye
    Boolseye is offline
    Boolit Master
    Join Date
    Oct 2010
    Location
    VT
    Posts
    1,849
    Nice. Thanks guys,
    -BE


    Sent from my iPhone using Tapatalk
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

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