Just got a 12 lb jug of some old powder called HS-10 sold by Hodgdon. Had a folded up data chart attached to the bottle and the fellow gave me the loading data book too. Anybody know when this manual came out? The prices for the powders are incredibly cheap. Even cheaper than I paid in the mid 60s..but my prices for a 100 lb keg of 4831($70) were delivered. All the listed data for HS 10 were for cast or swaged bullets. Now it was really cheap so even if I can't use it the booklet is worth the 10 bucks I paid...just for collecting purposes. If I can it will be fun to try some loads out. The fellow had another empty can with some dregs of powder left. It actually looks like AA9 or an iteration of WC 820...295/296 who knows. Anybody on board here who has ever used HS-10?? It would probably have to be an oldster LOL Like me

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HS-10 is one I have never used but I do have some old data for it. Strikes me as being something similar to Unique.

Well HS6 isn't too quick, and HS7 still slower yet. I would guess HS10 is even slower? Total guess. I can't see you're loading book, but is there a load for .410? If yes, how does it stack up against 296 data for .410?

Edit:
I found some .44 Mag data from the manual you posted. The charge weights are lower than AA9 significantly. 9.5-14gr vs 18gr for AA9. So I guess it's not all that slow.

Here's where I found snippits of data from your book.
1950s Hodgdon's BASIC loading Data Manual Vintage Reloading Manuals RETAIL PRICE | #1796082894

HS-10 handgun reloading data from 1962:
.38 Special: 145, 4 gr; 155, 4.5 gr; 110, 6 gr - 791/895/1079 fps
.357 Mag: 146, 8.5 gr; 160, 8 gr - 1149/1046 fps
.44 Mag: 240, 9.5 gr - 1046 fps
.44 Spl: 240, 7.5 gr - 934 fps
.45 ACP: 230, 5 gr - 783 fps

From what I've read the HS is for Hodgdon Shotgun powder.

HS-5 was the fastest and about the speed of W231.
HS-6 is slower and was,also sold as W540.
HS-7 was also sold as W571 and of course even slower. It is as slow as 2400.

I never used HS-10 but I'm sure it's even slower and probably as slow or slower as W296 and was probably used for 10ga shot shells.

Sorry I can't be of more help buttheads let us know what can be loaded with it.

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Well that manual had a load of data. With some for cast lead bullets and most was for swaged bullets?? Swaged lead or jacketed?? I was kinda looking for an approximate date this stuff was sold as I am going to call Hodgson to see if they can answer some questions. I can post a pic of the data page for HS-10. I have 5 or 6 pounds of HS-5 and about the same of HS-7. The HS-6 got used mostly in 28 ga. On the price sheet page they had surplus 4831 for about 50 dollars per 100 pounds. There is some data for lead bullet loads in rifles like 30-06 somewhat like you can find for Unique and some other pistol powders. I am going to have to try some of this stuff. I mean 80 cents a pound if it works for anything IS kinda neat. Thanks for the answers y'all!

Also should state cost printed on the manual I have was 50 cents. If I can get a response from Hodgdon on this powder I will post what they said

Wow, at 80 cents a pound you didn't lose anything, even if you wind up burning it in the backyard just for kicks. That's a neat find.

When powders were very hard to find, I managed to get some Green Dot. Primarily a shotgun powder. Had some pistol data on it. Contacted Alliant, told them what I wanted to load (calibers) and they sent me more data. You might have the same results with Hodgdon. Bob

If the data I presented in #4 above is even approximately correct, HS-10 is very likely to be in the Green Dot-Unique range.

From reading Hodgdon's Manual #19, second edition, it looks like HS-10 was replaced by Topmark, HS-5 and HS-6 that were introduced in Sept.'63.
In that same edition, HS-10 is NOT shown on their price list, but is shown for very few handgun loads which you probably have already seen.

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Good shooting.

Just got off the phone with Hodgdon about the HS-10. They told me the powder is essentially the same speed as Universal or Unique. All the data listed is with lead swaged or cast lead bullets. Told me the only data they have with HS-10 is lead bullet only so to load only lead or maybe plated. The data manual I have came from either 1961 or 62 as it has a 50 cent price. While talking with them I also asked about BL-C and the newer BL-C2. I was given 4 lbs of BL-C and they told me that the two are identical burn rates..So I can get to use that powder too. Discussed HS-5 6 and 7. HS-6 and 7 are Win 540 and Win 571 . HS-5(once described to me as Win 473) are not and have no correlation to each other. They surely do not look alike. But I have shotshell and handgun data for HS 5 anyway. Always nice to get the info from the horses mouth.

As I suspected. Back in 1962, virtually all factory revolver ammo had only lead bullets. Semiauto pistol ammo (.45 ACP, .380, 9mm, .32 ACP) almost always had only FMJ bullets.