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E3 Loading Data For .357?


Cholla

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I have been reloading .38 Special 105-grain bullets with 3.1 grains of E3. I want to change over to .357 brass and eventually go to 125 RNFP that I will be molding. I would assume 3.1 would still be fine for the 105-grain bullets in .357 cases. From what I see on other forums the rule of thumb is to use the reloading data for RedDot and lessen it by 10%. Using that data, the same charge should be a good starting place for the .357 cases with the 125 RNFP.

 

Anyone else with experience using E3 in .357?

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  Here are some tests I ran back in '13 when powder was in great shortage. This was really meant to be a comparison test and not necessarily load development.

  e3 is a very fast burning powder, faster than even Red Dot or Bullseye, so use it with caution.

 

Firearm- Uberti Hombre; .357 Mag.- 4 3/4" barrel
Case- R-P
Primer- Tula SPP
Bullet- H&G #51 160 gr. SWC, ACWW, .358"

e3- 2.5 grs.; 683 fps; e.s.=50
Bullseye- 2.5 grs.; 650 fps; e.s.= 37

e3- 3.0 grs.; 777 fps; e.s.=67
Bullseye- 3.0 grs.; 730 fps; e.s.=22

e3- 3.5 grs.; 858 fps; e.s.=22
Bullseye- 3.5 grs.; 828 fps; e.s.=11

 

 Bear in  mind that any load you use in a .38 case will give less velocity (and pressure) in a .357 case.

 

 Cholla (Also)

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