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Hot Topic (More than 10 Replies) 40-70 straight loads (Read 1073 times)
Oakdale
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Re: 40-70 straight loads
Reply #15 - Apr 24th, 2025 at 2:16pm
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That's the 4th Edition, first printing Oct. 2010. Sometimes the 3rd Edition is referenced to.

Two pages, (8) bullet examples; (3) RCBS and (3) Lyman molds, all smokeless. 

Tom
  
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calledflyer
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Re: 40-70 straight loads
Reply #16 - Apr 24th, 2025 at 2:33pm
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I used that 40% equation to load for my old .40-82, but just for the maximum. Never reached that stage in it because accuracy (what little it had) started to diminish at a lower level. Beyond that I have seldom used 4198 and have two or three pounds of it just sitting around.
  
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Mal
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Re: 40-70 straight loads
Reply #17 - Apr 26th, 2025 at 6:32pm
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I use 27 gns of 2207 (H 4198) in my 40/65 Behind  a Brooks 2 dia goes just on MOA @ 100 yds. Use 1 grn of Dacron as a filler. Cheers Mal in au. Usual BP load was 70 gns Wano P.
  
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jhm
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Re: 40-70 straight loads
Reply #18 - Apr 27th, 2025 at 12:18pm
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May be a silly question but I have asked them before. If I rent  a 40-70 straight reamer what length would I probably get? Have a friend who is building a gun in that caliber. He doesn't want to buy one for just one chamber and doesn't want to wait a lifetime to get it so renting is his hope. Or maybe just maybe someone here would offer up one?



JMH
  
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bobw
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Re: 40-70 straight loads
Reply #19 - Apr 27th, 2025 at 1:01pm
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If you look at 4D rental you will find this drawing for their 40-70ss reamer.  I’m pretty sure it’s intend for 405 brass.
I’ve included the 405 specs for convenience.
405 brass is out there but not cheap.   
Bob
  
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Old-Win
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Re: 40-70 straight loads
Reply #20 - Apr 27th, 2025 at 1:41pm
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Keep in mind that the .405 Winchester and the 40-70 sharps straight are not that close to being the same case. Early original .405 Winchesters used a larger diameter bullet than the 40-70. If you use a .405 reamer based on the early case, on a modern .400"-.408" barrel, you will end up with a sloppy chamber. The original .405 Winchester case and bullet was based on a .411 groove diameter barrel. Rim dimensions are different too.
« Last Edit: Apr 27th, 2025 at 1:59pm by Old-Win »  
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marlinguy
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Re: 40-70 straight loads
Reply #21 - Apr 28th, 2025 at 10:28am
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I use .405 Win. brass for all of my single shots in .40-70SS and .40-70 Ballard, and they all have groove diameters between .411"-.412" Just shorten them slightly to fit.
  
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