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Old February 10, 2013, 07:47 PM   #1
Barnacle Brad
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140gr Cowboy .357 load advice

I have IMR sr4756 I want to use, but the load data does not list this powder (Hornady). I assume this is due to excess velocity for the lead bullet. Am I better off sticking to the listed powders?

Is there a risk in reducing the starting load given for the same weight of a jacketed bullet?

Thanks!
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Old February 11, 2013, 11:12 AM   #2
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please opine

Any opinion welcome!

Thanks
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Old February 11, 2013, 02:06 PM   #3
Hammerhead
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The Hornady 140 LFP's are generally best shot using small charges of fast powder. SR 4756 is pretty slow for a light lead bullets, probably why there's no data. There is some data for a 125 grain lead bullet using 4756 at the Hodgdon site.
Trail Boss is my favorite powder for the Hornady 140's in the .357 mag. Clays works well too. Unique or Universal would probably work OK if you don't have a faster powder.
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Old February 11, 2013, 03:42 PM   #4
Barnacle Brad
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Burn Rate

Thanks for the info. The recipe I have that came with the bullets (from a friend) is for 3 gr Trail Boss. I just don't have it (or another fast burner) on my shelf. Not in a position to run out and buy any right now either.

After looking more closely on the Hodgdon Site. I see data for 130gr MEI CAST LRNFP at 5.5 gr (sr4756) and 148gr HDY LHBWC at 3.8 gr. I wonder if this lack of data for the 140gr may be a marketing strategy to promote the Trail Boss powder? Curious...

Think what I will try is an average of those two loads and back it off 10%. That would give me a starting load of 4.2gr. That puts me .3gr under the max load for the 148gr bullet.

Does that sound like a rational approach?

Thanks again!
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Old February 11, 2013, 05:12 PM   #5
L_Killkenny
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I have no idea where Hodgdons came up with their min and max for .357 trailboss loads. I use "their" formula and came up with completely different loads then theirs. Hotter for the record. Using 158gr Berry's plated bullets I came up with 3.5-5.0. Hogdons listed 3.2-4.2. I tested various loads using these bullets from 3.2 up to 4.7 without issue. Note: Bullet seating depth is the issue. Don't compress Trailboss and don't go below 70% and you'll be fine.
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Old February 12, 2013, 02:53 AM   #6
Hammerhead
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Don't go by the 148 grain load, that's a wadcutter seated deep, so that info can't be used for a standard bullet.

The 130 cast starts at 5.5 4756
The 140 jacketed starts at 5.3 4756

I would start at 5 grains of 4756 and work up toward 6 - 6.5 grains.

They do seem to push Trail Boss some, but it's a darn fine powder for light bullets in long cases.
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Old February 12, 2013, 03:41 PM   #7
Barnacle Brad
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Sounds good Hammerhead. Will use c.o.l. as stated in the Hornady book for the 140 cowboy.

Must have some trail boss in the future.

Thanks for your help!
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Old February 16, 2013, 05:15 PM   #8
Barnacle Brad
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Load Data:
.357 mag Smith & Wesson Model 586 4 inch barrel
Hornady .38 caliber 140gr FP-Cowboy
IMR sr 4756 5.5gr
CCI 550 primer
C.O.L. 1.550"
Medium Crimp

Notes:
Started with 5.0gr 4756. Test fired 5 rounds.
Separate operations for bullet seat and crimp.
Muzzle velocity unknown.
Light recoil.
Very accurate off rest at 15 yards.
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Old February 16, 2013, 11:05 PM   #9
joneb
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I ordered some 140gr RNFPBB premium grade from Penn bullets, they are slammed so I maybe waiting for awhile
Penn states these can be pushed to 1600 fps, I'm planning on trying Accurate #7 and 2400 for a 2.75" Ruger Sec. Six if I can get around 1,200 fps I'd be happy.
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