That's a British cartridge. But it's just a special loading of the 38 S&W. They called it the "man stopper" load IIRC. They also used that term for heavy for caliber 45 caliber loadings.
The 38 S&W case is not a shortened 38 Special. It's dimensions are a bit larger in diameter like the bullets it specifies which are .360"
Pure lead is correct but a soft mix of 1:30 or 1:20 (tin/lead) is ok.
As to finding the proper bullets... that's going to prove difficult. You'll have to cast you own. I'm not sure if any major company makes .360" bullet molds but they might.
If you're just looking for good target loads, then you can use hollow based wad cutters of .358" and they will work just fine. The thin "skirt" of the base of these bullets expand very easily to fill the bore and give good accuracy. They are going to weigh 148 grains. Hornady and Speer both make these bullets.
I like
http://www.grafs.com - prices shown are with shipping and they tend to carry stuff like this. They have the HBWC Hornady bullets in stock:
http://www.grafs.com/retail/catalog/...productId/6005 For the brass, check out
https://www.starlinebrass.com/brass-...8-SandW-Brass/.
Grafs has Hornady dies on sale:
http://www.grafs.com/retail/catalog/...roductId/28408 They list these as 357 Mag/38 Special/38 Long Colt/38 S&W... so I guess that's what you use - especially if your loading the .358" bullets. But I do know that the 38 S&W was slightly different (larger) in diameter...
For a propellant, you'll want a fast burning powder like Bullseye or W231. 3 Grains of either of these under the 148 HBWC bullets will give good results and around 800 fps.
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