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Thread: RCBS A4 Big Max Standard Shell Holder Adapter Drawings

  1. #1
    Frosted Boolits


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    RCBS A4 Big Max Standard Shell Holder Adapter Drawings

    A few members have contacted me in search of a standard shell holder adapter for the RCBS A4 Big Max. I decided to take some time this morning to take measurements off of mine. I plan on making a few here in the next few months for those guys that would like one. I understand that there are other ways around this, like by using a ram prime unit, but there are those out there that would like one like the original. So, if any machinist out there would like to crank one out and check my dimensions, have at it. Here is my best effort at taking the measurements. If anyone sees a mistake or has any questions please let me know. I also included the tool used to tighten the adapter into the ram.

    A Few notes: Shellholders will index on the deck of the t-slot for height and the back of the 7/16 endmill cut for front to back indexing. Maritool has t-slot cutters at 1/2" for like $15. They come in different thicknesses too. You will have to make a couple passes to get the t-slot wide enough (because the cutter is only 1/2" and the width of the slot needs to be .567" wide).

    Stock RCBS adapter and tool

    Attachment 156085

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    Adapter and Tightening tool I make

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    If you want me to email it to you send me a PM and I will email it or picture text it to you. Thanks!

    If you wish to purchase an adapter and/or tightening tool, please pm me for current prices and options. Thanks!
    Last edited by IllinoisCoyoteHunter; 02-10-2018 at 02:20 PM.
    Looking for an RCBS A2 with the removable bushing. I need it to complete my A series collection. Please let me know if you have one you want to get rid of. Thanks!

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  2. #2
    Boolit Master
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    What do you think the cost will be for a replacement A4 shell holder?
    Robert Abbott
    "I don't save money reloading. I just get to shoot more."

  3. #3
    Frosted Boolits


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    I wont be able to do it for a few months as I don't have access to a mill for that amount of time. I hope to get a few turned on my lathe in the next few weeks, and then finish mill them when I get access to mills (when school starts back up, and I get all my school projects finished for the semester LOL).

    I will make them from 1144 and price will be determined. If anyone else wishes to make a few and sell them feel free to use the plans. When I make them they will be mainly for practice, and I will not charge that much. I also have to put in a call to RCBS to see if I can get some retainer clips.
    Looking for an RCBS A2 with the removable bushing. I need it to complete my A series collection. Please let me know if you have one you want to get rid of. Thanks!

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  4. #4
    Boolit Master



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    I will take two. You know I will. No problem with a wait. I am very grateful you would do this.
    "Had his shooting been as good as his running, he might have given a better account of himself."
    James. C. Henderson

  5. #5
    Frosted Boolits


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    Revised. Saw one mistake. T slot dimension corrected. Depth (up and down) of t slot is critical, so it shellholder wont go in, take some off the top of the t-slot, don't go deeper (down).
    Looking for an RCBS A2 with the removable bushing. I need it to complete my A series collection. Please let me know if you have one you want to get rid of. Thanks!

    My Feedback : http://castboolits.gunloads.com/show...iscoyotehunter

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  6. #6
    Boolit Master
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    Is this a replacement for lost/broken ones or something improved? My shell holder is fine. So just wondering.

    geoff in Oregon

  7. #7
    Frosted Boolits


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    I have had a few guys contact me who have purchased used presses that only came with the universal shellholder. It is a pain to use. And of course RCBS doesn't have any more replacements.
    Looking for an RCBS A2 with the removable bushing. I need it to complete my A series collection. Please let me know if you have one you want to get rid of. Thanks!

    My Feedback : http://castboolits.gunloads.com/show...iscoyotehunter

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  8. #8
    Boolit Master
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    If RCBS had never manufactured the 3 fingered universal they could have reduced the price of the Big Max about $60 and there might be a lot more of them around.
    EDG

  9. #9
    Frosted Boolits


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    Bump with some much-easier-to-read plans LOL.
    Looking for an RCBS A2 with the removable bushing. I need it to complete my A series collection. Please let me know if you have one you want to get rid of. Thanks!

    My Feedback : http://castboolits.gunloads.com/show...iscoyotehunter

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  10. #10
    Boolit Master



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    Nice work.
    Glad you are still on this.
    Thanks
    "Had his shooting been as good as his running, he might have given a better account of himself."
    James. C. Henderson

  11. #11
    Boolit Master



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    Quote Originally Posted by EDG View Post
    If RCBS had never manufactured the 3 fingered universal they could have reduced the price of the Big Max about $60 and there might be a lot more of them around.
    Anyone have an idea how many where manufactured?
    Last edited by M-Tecs; 01-04-2016 at 04:42 PM.

  12. #12
    Boolit Man
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    I am interested in one also. I bought a used A4 several years ago but haven't used it because it only has the universal shell holder. Nice job on the drawings. Thanks for doing this!

  13. #13
    Boolit Master
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    That was back in the mid 1980s before we had Email. I suspect that RCBS made them in house or if not out sourced to one of their favorite local machine shops.
    Back then only specialty items might result in taking a plane trip to find a vendor. I did that for die casting dies and plastic injection molds.
    California has a very, very high level of manufacturing capability and sophistication due to aircraft and semi-conductor industries. There would have been no reason for them to go very far to have these parts made. However the main bugaboo for California is cost. Everything in California is expensive.


    Quote Originally Posted by M-Tecs View Post
    Anyone have an idea how where manufactured?
    EDG

  14. #14
    Boolit Master



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    I didn't proof read. If left out "many". My question was how many A4 RCBS produced. I have two and both have serial numbers.

  15. #15
    Boolit Master



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    Good question. Less than a thousand?
    "Had his shooting been as good as his running, he might have given a better account of himself."
    James. C. Henderson

  16. #16
    Frosted Boolits


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    I will have to look at the serial number on mine when I get home.
    Looking for an RCBS A2 with the removable bushing. I need it to complete my A series collection. Please let me know if you have one you want to get rid of. Thanks!

    My Feedback : http://castboolits.gunloads.com/show...iscoyotehunter

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  17. #17
    Boolit Master
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    I have two A4's, Serial Numbers: 04415 & 08226.

    I would LOVE to get (1) standard shell holder for my second. If there is a list, put me on it!!
    Robert Abbott
    "I don't save money reloading. I just get to shoot more."

  18. #18
    Boolit Master

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    Hi,
    I guess we could have a "highest number" contest!

    Won't see mine for another week or so, just found one, or one found me I guess, missing the shellholder adapter also!

    ICH, emailed me the "new improved" blue print!

    Sort of like belonging to a club, everyone seems to love em, that's got em!

    Now with a RCBS Big Max,RCBS A2, Bair Kodiak 150, and CH Champion, I'm the meanest reloader on the block!
    “If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace.
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  19. #19
    Frosted Boolits


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    Eye candy lol....just playing around. We will call it a practice run. Now....just gotta mill a bit...
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    Looking for an RCBS A2 with the removable bushing. I need it to complete my A series collection. Please let me know if you have one you want to get rid of. Thanks!

    My Feedback : http://castboolits.gunloads.com/show...iscoyotehunter

    An armed society is a polite society.

    the BB knows

  20. #20
    Boolit Master



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    Just unpacked mine, #7870. It a cool unit to be sure.
    "Had his shooting been as good as his running, he might have given a better account of himself."
    James. C. Henderson

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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
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LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check