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Chris W
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40-90 BN Question
Jan 31st, 2024 at 10:26am
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For those of you that load this round, what are you using to expand the mouth of the cartridge to get a paper patched bullet to start? I have dies and brass, but need the mouth belled a little more to start a PPB.  thanks
Chris
  
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marlinguy
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Re: 40-90 BN Question
Reply #1 - Jan 31st, 2024 at 12:19pm
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I don't load the .44-90, but I load .44-77BN and bell case mouth slightly using my Lyman M die set. I just use a .457" expander and set it to just kiss the case mouth enough to allow bullets to seat without issue.
I use my M die set of expanders on a bunch of bottleneck cases that don't come with expanders for belling the case mouths.
  
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Chris W
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Re: 40-90 BN Question
Reply #2 - Jan 31st, 2024 at 2:13pm
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My M Die is for my 45s and the diameter is to large to even start in the .40s mouth, I tried it last night, I guess I could chuck it up and bevel the end a little so it would just start and not effect it for my 45 cases.
  
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Chris W
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Re: 40-90 BN Question
Reply #3 - Jan 31st, 2024 at 2:58pm
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Track of the Wolf had inserts for my M die and powder compression plug so went ahead and ordered it. I'll make something work till it arrives.
  
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marlinguy
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Re: 40-90 BN Question
Reply #4 - Jan 31st, 2024 at 5:17pm
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I've made expanders by buying hardware store bolts and turning the shanks down to the size and shape I needed. If I recall correctly all the major die makers, and the M die bodies use a 9/16" bolt. Don't recall the thread count, but they're NF threads. 
I buy bolts with an inch of shank and cut the heads off. Then chuck the threaded end in my drill press and just use a file to shape it as it spins.
But if you have an M die already Lyman sells the expanders about as cheap as a bolt. Last I bought were around $3.75 each. I buy various sizes over what I need and shape them down.
  
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Ranch13
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Re: 40-90 BN Question
Reply #5 - Jan 31st, 2024 at 10:56pm
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A custom expander from Buffalo Arms that is about .002 over the patched diameter of the bullet. Be sure to chamfer the inside of the case mouth
  
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Ranch13
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Re: 40-90 BN Question
Reply #6 - Jan 31st, 2024 at 10:58pm
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One more thing you may find helpful is the powder charge in fire formed cases will likely be 2 grains heavier than the unfireformed
  
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steveu
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Re: 40-90 BN Question
Reply #7 - Feb 1st, 2024 at 1:19pm
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A .411/413 expander
  
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Jeff Michel
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Re: 40-90 BN Question
Reply #8 - Feb 1st, 2024 at 9:54pm
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I use an RCBS .408 expander die, similar to a Lyman M die. I use Starline brass (45 2.6) no problem with PP bullets starting with decent neck tension.
  
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Bulseyetom
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Re: 40-90 BN Question
Reply #9 - Feb 1st, 2024 at 11:18pm
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I load paper patched bullets in several 40 caliber rifles and am no expert by any means, but I don't expand the brass at all. Instead I fit my bullet diameter for a snug finger seat.  I can use the same cast bullet in two of my rifles by just changing the thickness of paper to achieve the desired diameter.  A good chamber cast is worth its weight in gold to decide what bullet diameter you want so that you can match the length of the freebore and still be seated in the case to your desired depth.  I use dual diameter bullets made by Accurate Molds to my specifications.  I don't use any dies at all for pp loads in my rifles except to compress the charge and seat the wads.  If you do expand the nexk then I highly recommend Buffalo Arms custom expanders.  Tom
  
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