SunnySlopes
Member
- Joined
- Nov 3, 2011
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- 1,223
45 Colt, .451 diameter, 200 grain SWC copper plated Xtreme bullets.
Firearm is a Winchester reproduction model 1873 in 45.
I want to use either Winchester 231, Titegroup, or Vihtavuori 3N37.
Looking at the reloading data for the Vihtavuori, I guess it’s too high pressure for the 45 Colt in the 1873 action. I’m surprised it doesn’t have a special category for the Ruger revolvers or Thompson Center pistols, though. Is there any way to extrapolate the data from other, similar Vihtavuori powders to the 3N37 powder for use in the standard 45 Colt cartridge?
Barring that, Titegroup has the starting load as 6.7 grains, 899 fps, 9600 CUP. Max load 7.5 grains, 989 fps, 12700 CUP.
231 is 7.8 grains, 956 fps, 11000 CUP. Max is 8.7, 1048 fps, 14000 CUP.
Above data is for jacketed bullets. They don’t give data for plated, but plated bullet manufacturers say jacketed data is ok as long as CUP isn’t exceeded for their bullets.
My questions are, can the Vihtavuori 3N37 data be extrapolated from other (similar) Vihtavuori powders?
Also, which of the other two powders would you use and what would your load be for (what appears to be a rather delicate firearm action) the 1873?
Firearm is a Winchester reproduction model 1873 in 45.
I want to use either Winchester 231, Titegroup, or Vihtavuori 3N37.
Looking at the reloading data for the Vihtavuori, I guess it’s too high pressure for the 45 Colt in the 1873 action. I’m surprised it doesn’t have a special category for the Ruger revolvers or Thompson Center pistols, though. Is there any way to extrapolate the data from other, similar Vihtavuori powders to the 3N37 powder for use in the standard 45 Colt cartridge?
Barring that, Titegroup has the starting load as 6.7 grains, 899 fps, 9600 CUP. Max load 7.5 grains, 989 fps, 12700 CUP.
231 is 7.8 grains, 956 fps, 11000 CUP. Max is 8.7, 1048 fps, 14000 CUP.
Above data is for jacketed bullets. They don’t give data for plated, but plated bullet manufacturers say jacketed data is ok as long as CUP isn’t exceeded for their bullets.
My questions are, can the Vihtavuori 3N37 data be extrapolated from other (similar) Vihtavuori powders?
Also, which of the other two powders would you use and what would your load be for (what appears to be a rather delicate firearm action) the 1873?
