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Old 02-09-2014, 10:17 AM
kkkenk kkkenk is offline
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I went to by powder yesterday told them I was loading 357mag/40s&w they sold me Herco. I can't find any load data for my 40 with 165gr fp. Can anyone help?
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Old 02-09-2014, 12:58 PM
Peter M. Eick Peter M. Eick is offline
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Older alliant manuals (7-1996 vintage) have some close data.

170 xtp they go 7.4 grains.
150 grns they go 8.2 grains.
180 grn JHP they go 7.0 grns.

For a 165 fp, I would use the 170 grn XTP as a high point and start 10% down. Work up over a chrono and aim for 1125 FPS for a 4" barrel.

If you are really hurting for data, herco loads "tend" to run about 10% more than Unique for the same bullet weight. Work up to Unique loads and then a "tad" more is probably safe. Be very very cautious though, you are really working with wildcats at this point since you are essentially making up data.
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Old 02-09-2014, 02:10 PM
retired_diver retired_diver is offline
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You could try looking up Handloads.Com Load Data - Handloads.Com and entering 40sw and bullet weight. they have powder manufactures and contributing members data. Always start low and work up, of course.
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Old 02-10-2014, 11:12 AM
mtgianni mtgianni is offline
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In Pet Loads Ken Waters states that Herco is the unknown King of the 40 S&W powders. It is a book I suggest every handloader should own.
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Old 02-11-2014, 01:58 AM
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papajohn428 papajohn428 is offline
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I don't have any data handy, but I've used Herco in the 40 and got higher-than-expected velocities, a good clean burn, and impressive accuracy. I'd use it more often but it's one of those powders I don't see very often any more. I ought to try it in the 45ACP as well. Some shooters also regard it as the perfect powder for the 9mm as well!
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