Hey bud, how's it going?
I looked and never found any for sale, that was a while back though. Try Joe Brancato at Airtanksforsale.com, he sells Huben and was going to try and get some of the slugs to sell. You also might want to try krale-schietsport in Europe, they're a Huben retailer and sell to the USA. Their shipping prices are very fair too. I never did find any of the Huben slugs but maybe now they're more available.
Because I couldn't find the Huben slugs, I started looking for other brands of high quality slugs. I ended up buying from Airguns of Nebraska, they had products in stock that I couldn't find anywhere else like AONCO, Rat Sniper Slugs, Wicked Monster and many others in all the popular calibers. I bought 4-5 tins of 100 and the owner threw in probably 175-200 additional slugs(25-50each) in all weights, sizes and shapes for me to try out. He's a great guy, very knowledgeable and the slugs he sells are very high quality. I attached a picture of the slugs I got for my .25 cal. None of them shot particularly well out of my gun because it's not a slug barrel, so I have almost all of them theft. I would have been happy to send you some to try out but mine are for a .25 and won't do you any good. I'll probably just end up selling them to somebody for a super great deal.
Anyway, in the picture you can see that there are many different varieties to try out; boat tails, rebated boat tails, flat base, recessed base, hollow points, massive hollow points, pointed, etc... The 25.5gr. Wicked Monster hollow points and the 32gr. Wicked Monster rebated boat tail shot very well out of my gun but most of the others didn't. I know that's probably not much help to you since you're looking for a .22 slug but I thought I'd share in case someone can use the info.
I hope this helped you out at least a little bit. Good luck with your search and have a great day! Stoti
P.S. We still need to get a small group of guys together and have a little fun shoot in Nor Cal. Everything around my house, most of Lake and Mendocino Co. for that matter is burned and looks like a moonscape. It will make it easy to get in some long distance shooting. We can sit on a hill top and see everything for miles! Lol!
