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Thread: 350 Legend and Cast Boolits

  1. #321
    Boolit Master Oldfeller's Avatar
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    What is next? I have two tools coming from China, the first one will be used as a simple round nose bullet form. I will take wooden block castings from that tooling and try to understand pure round nose loading issues better before going to the next step.

    Round nose tool cast forms can get turned into round flat meplat slugs on my lathe for testing, with various sized
    cut to true meplats so as to see the best size to avoid loading issues and loading damage.

    This avoids the sin of "going too far" on the can't go back tooling changes, a sin I have committed twice now.

    These simple round nose forms can also be machined into hollow points so I can understand the loading characteristics of those hollow point forms.

    A simple view of things long term says I could make up a whole bunch of simple powder coated round nose forms into loaded rounds, then build a simple aluminum round tool to slip over the assembled bullet and quickly drill machine the PC'd bullet make the final hollow point bullet form, or else maybe use the old RCBS lubricizer to top punch size a shallow hollow point into a bunch of the PC'd bullets before loading them.

    Accuracy destroying balance errors may well enter into these somewhat crude hollow point methods. not good

    I suspect any form of post PC machining could hurt accuracy, so some "totally captive" die steel based nose forming machining that takes place at the actual final sizing operation might be better for keeping as much "on center and perfectly balanced" accuracy as possible. As would starting out with the simplest, best most "accuracy stable" cast bullet form that is found out of all the testing.

    In the function of the LEE push through die there is a limited length tight zone that does all the sizing, so if I made up a pusher spud that goes into the ram that just happened to push the bullet into the sizing die and leave it on purpose in that tight zone (to park the unmachined undamaged PC'd bullet right at that perfect constriction zone) then I could then come in from the top with an aluminum bushed drill driven conical tool that could cut some very on-center very consistent depth hollow point forms into that captive, on-center bullet. Then I would swap out the short spud that is on the press ram and then finish the sizing stroke and ejecting the bullet by pushing it only from the bottom.

    Machining tool would look a lot like this (less the shouldered aluminum rod it is inserted into, of course).

    Click image for larger version. 

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    Run out in this cutter would simply make a balanced, on-center very slightly larger diameter hollow point cavity.

    Not many hunting bullets are actually needed, so some mild gyrations to make them are OK by me.
    Last edited by Oldfeller; 01-25-2020 at 09:10 PM.
    All retired now, just growing tomatoes and building and shooting my guns.

  2. #322
    Boolit Master
    Join Date
    Jul 2015
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    595
    With PC, it is very practical to do final sizing and reshaping of boolits after PC is applied. Back in March of 2018, I made a post describing something I called "No Jacket Swaging (NJS)". The post is copied below.

    I have been using it a lot since then. All of my 357AR 180s and 200s are sized and slightly reshaped with a single pass base first NJS.

    Click image for larger version. 

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    I use NJS on my Lee tumble lube 158 RNs that drop at 0.356". With a single pass base first NJS I get improved shape boolits and the size is increased to 0.359"

    Click image for larger version. 

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    I just finished loading a batch of 30 cal "long nose" Lee 150s. I used a nose first single pass NJS to size down the nose to 0.299", lengthen the nose (eliminate the bands on both sides of the crimp groove) and size the remaining two bands to 0.311"


    Text from March 2018 post:

    My current ongoing experiment includes "something entirely new" (where there is really little or nothing "new").

    I am currently making my own low tech, soft steel dies that allow No Jacket Swaging (NJS).

    With PC, a boolit can be made NJS style as follows:

    - A no lube groove mold is used to drop boolits fast & easy.
    - Neither the mold nor boolits need to be perfect.
    - PC is applied (I use ASBB HF red) on the as cast boolit.
    - The boolit is then formed to the final shape with one or more swaging passes.
    - Swaging passes are pushing the boolit up into the die and then back out the way they went in instead of the push through process.
    - One pass will be base first to get perfect, uniform, crisp, full circumference edge on the base.
    - The base first pass can also increase or reduce the boolit diameter and do minor re-shaping of the nose at the same time.
    - A second pass can be nose first to get a nose rider section that is just the right final OD and is perfectly concentric with the base.
    - My current nose first die allows me to take a boolit that is 0.309" with no nose rider portion and "add" my desired 0.299" nose as the last step.

  3. #323
    Boolit Master Oldfeller's Avatar
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    What do you use for a swaging press?
    All retired now, just growing tomatoes and building and shooting my guns.

  4. #324
    Boolit Master
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    Jul 2015
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    595
    Since there are no jackets involves and re-shaping is minor, my old Lee manual turret works fine. It take less effort than re-sizing 44 mag cases.

    Click image for larger version. 

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    Last edited by P Flados; 01-26-2020 at 09:46 PM.

  5. #325
    Boolit Buddy mehavey's Avatar
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    Aug 2012
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    FWIW:


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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