I had the same problem. Found 1 box locally. & someone sent me this link. https://lockedloaded.com/product/remington-ammunition-l38s2b-umc-38-special-jhp-125-gr-100box6case#product_detail
I placed an order with Midway on Dec 23rd. They had a limit of 2. So I ordered 2 gen 2s. 2 gen 3s & 2 20 rd. Received the gen 2s today. The other 4 are still back ordered.
The Herters Select brass sold by Cabelas is now mfg. by S&B. Looks identical. I was wondering why the boxes changed to the same size as Sellier & Bellot. & then I read the back.
http://www.youtube.com/watch?v=o5cm91dFXJo&feature=g-u-u&context=G2da0c77FUAAAAAAAEAA
I watch all his videos. He hasn't done anything on gun rights lately & I haven't posted anything in a while. So I figured I'd post it.
I shot 50 rounds on sunday. Seemed fine to me. Shot a few inches low at 25'. The smell reminded me of auto body filler. The barrel cleaned up good. I'm not sure how dirty it is because I ran a few boxes of S&B through it first. I'd buy more, as long as it's not over $10 a box.
Haven't tried it yet, but I bought 4 boxes of 9mm last week. It's got some good reviews on Cabelas website. $9.99 a box & it's made by Blazer here in the USA. Never had any problems with Blazer aluminum cases before. Just can't reload it.
Polygonal rifling is the term you were looking for.