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Thread: Lyman M die vs. Dillon RL550B funnel

  1. #1

    Lyman M die vs. Dillon RL550B funnel

    I understand the purpose of the Lyman M die is to expand the resized case neck to accept a cast bullet without deforming it. It seems the funnel used with the Dillon RL550B to charge the case with powder when appropriately adjusted serves the same purpose, thus eliminating a need for the M die. I invite comment, pro or con.

  2. #2
    Boolit Buddy

    Join Date
    Feb 2013
    Kaukuana, WI
    My experience (with a 650 but same funnels is my understanding) is they are for jacketed bullets and so the tend to be too tight for cast boolits. The Dillon funnels also do not have the wider step that the m dies do that make seating the bullet a bit easier.

  3. #3
    Moderator Emeritus
    garandsrus's Avatar
    Join Date
    Jan 2006
    Warren, MI
    The Dillon powder funnels work fine with cast bullets most of the time.

  4. #4
    Boolit Bub
    Join Date
    Aug 2013
    Southern Maine
    I have been making my own expander/funnels for a long while. The right amount expansion to the required size needed for my pistols has very much improved my groups. Improvments from 38 wad cutters to 44 mag 240gr. I never had any luck with the Dillon funnels with cast bullets.

  5. #5
    Boolit Master

    BrassMagnet's Avatar
    Join Date
    Apr 2012
    Dillon pistol funnels work fine.
    Dillon rifle funnels don’t because there is no expansion.

  6. #6
    Boolit Master
    Join Date
    Nov 2012
    Central Virginia
    I had Lathesmith make a couple of handgun cartridge powder funnels for a Dillon 550. The powder through expanders (Dillon powder funnel) that Dillon supplies are not optimal for cast bullets. The Dillon funnels work but they don't expand the case enough for cast bullets and the casing tends to swage soft lead bullets down a little bit.
    The Dillon powder funnels also lack the Lyman "M" die type "step" that helps to align cast bullets before they are seated.

    The powder funnels that Lathesmith made for me are absolute game changers. I highly recommend them.

    The stem of the Dillon powder funnel is a bit small for cast bullets and the top of the funnel flares the mouth of the casing in a cone shape as opposed to the more parallel flare that the "M" die profile imparts to the casing.

  7. #7
    Boolit Master
    Join Date
    Mar 2014
    St. Louis
    Agree with Petrol. Lathesmith made me one for my SDB which works in the 550 as well. My OEM Dillon funnel plug expanded the brass .353 for 9mm allowing the brass to swage down my boolits. The one he made for me expands deeper and wider without overbelling the case mouth and cracking it. Its loaded prolly 50k 9mm in the last 3 or 4 years. His work is good and he's a helluva nice guy to talk to.

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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