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Bulseyetom
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What velocity can I expect
Apr 20th, 2020 at 5:14pm
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Working on a duplex load in my 40-70 SS with a 29" barrel.  I have a chamber that was cut to handle 405 brass full length and am using a 330 gr bullet patched to allow seating of only 0.15 into the case.  I am using 6 grains of Re7 and the case filled with Swiss 3f, a 0.060 vegetable wad, a 1/8" cookie of Tropic, a 0.030 plastic wad all compressed to allow 0.15 hand seating.  I haven't weighed the blackpowder charge as I use a Belding & Mull and just go by volumes to allow a slight compression.  Any idea what velocity I might be getting?  Looking to hunt antelope this fall and was curious as to what the trajectory might be.  Thanks.  Tom
  
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Jeff_Schultz
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Re: What velocity can I expect
Reply #1 - Apr 20th, 2020 at 5:52pm
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  I suspect the velocity with that load would be about 1300 to 1500fps. With that weight bullet the trajectory should be about what the trajectory tables say.
  
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oneatatime
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Re: What velocity can I expect
Reply #2 - Apr 20th, 2020 at 7:30pm
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Hey, you're going to get within a 100 yards anyway, right?
  
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