59 F, 80% RH, 30.07" Hg
***CHRONY DATA***
.357 Mag 130-gr Coated RNFP, WSP(m), IMR PB Powder, 1.564-1.571" COAL
Taurus 66
with 6" barrel
4.6-gr powder - AVERAGE =
855 fps - ES =
59.6
5.2-gr powder - AVERAGE =
930 fps - ES =
80.5
5.7-gr powder - AVERAGE =
979 fps - ES =
83.2
At least I FINALLY found a safe load to use to burn up that pesky jar of IMR PB powder I have laying around. The 4.6-gr load is only moving at .38 Special velocities but what the heck.
.357 Mag 130-gr Coated RNFP, WSP(m), HS-6 Powder, 1.554-1.570" COAL
Taurus 66
with 6" barrel
11.1-gr powder - AVERAGE =
1305 fps - ES =
55
11.3-gr powder - AVERAGE =
1388 fps - ES =
75
11.6-gr powder - AVERAGE =
1365 fps - ES =
123
12.0-gr powder - AVERAGE =
1416 fps - ES =
73
Now THESE were some stiff loadings. I don't know why the 11.6-gr load had such a wide ES (5-shot strings all) compared to the others. Still, any of the others would make excellent practice .357 Magnum loads, which is all I expect out of my handloads.
Notice that these were very similar to some 125-gr copper plated loads I used and yet got a LOT more velocity with the coated bullets.
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