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richie
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40-70 sbn loading
Jun 21st, 2018 at 1:45pm
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help needed with smokeless load data for  40-70 sbn,
  
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ww
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Re: 40-70 sbn loading
Reply #1 - Jun 21st, 2018 at 2:56pm
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Cartridges of the World lists 330gr lead IMR 4759, 26gr, 1510 Fps
27gr IMR 4198,1450 Fps.
Lyman 403139
I use 45-90 Star-Line brass and try to 2.250.
WW
  
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richie
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Re: 40-70 sbn loading
Reply #2 - Jun 21st, 2018 at 4:09pm
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i have tried several loads with 400 gr postel : 4227 21gr  all over the place, 3031 41gr. recoil brutal inaccurate, 4895 37-38 gr. poor group excessive recoil.   best so far 4759 - 19 gr. unsized or sized have shot 1 1/4 but not consistant, next 5 shot 3"--- 4759  18.5 gr same results 1/12
im working at it, 
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oneatatime
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Re: 40-70 sbn loading
Reply #3 - Jun 21st, 2018 at 5:09pm
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What's your twist?
  
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richie
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Re: 40-70 sbn loading
Reply #4 - Jun 21st, 2018 at 5:46pm
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shiloh sharps #3    1-18   307 grove dia. 400 gr postel alloy bhn #8
  
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oneatatime
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Re: 40-70 sbn loading
Reply #5 - Jun 21st, 2018 at 5:53pm
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I think your bullet is too heavy for an 18 twist. I had to go to a 370 grain Saeco 640 to get good results in my 18.
  
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beltfed
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Re: 40-70 sbn loading
Reply #6 - Jun 21st, 2018 at 6:02pm
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ONEATATIME IS correct. YOu need to go with
about a 1.25" long bullet for 18 twist 40.
"we know from experience"
beltfed/arnie
  
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bruce moulds
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Re: 40-70 sbn loading
Reply #7 - Jun 22nd, 2018 at 3:38am
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beltfed wrote on Jun 21st, 2018 at 6:02pm:
ONEATATIME IS correct. YOu need to go with
about a 1.25" long bullet for 18 twist 40.
"we know from experience"
beltfed/arnie


what he said
  
ventum est amicus meus
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ten-mile
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Re: 40-70 sbn loading
Reply #8 - Jun 22nd, 2018 at 8:13am
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My 40-70BN is actually a Remington #1 Sporting rifle.  The twist is 1 in 20.  It will not shoot 400 grain bullets but anything in the 350-370 grain will do great.  I have an extra 412263 and I think a Saeco 640 if you think they will do any good for you.
  
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CptCurl
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Re: 40-70 sbn loading
Reply #9 - Jul 2nd, 2018 at 5:10pm
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It's a great cartridge for loading black.

I just posted my BP load for the .40-70 SBN at this thread:  (You need to Login or Register to view media files and links)

Best of luck,
Curl
  
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