holahead,
I can't tell you anything about the 308s.
My experience is with the the 158 gr., RNFPL, 38 Specials and the 158 gr., JHP, 357 Mags.
I use them exclusively in my revolvers for target practice and plinking and pretty much just having a great time.
They are inexpensive: for example, a box of 50 of the 38s cost me $8.50, and a box of 50 of the 357s cost about $15.00.
I've always thought that they were using once fired brass and thus the cartridges were reloads and hence the good price, however, my local gun dealer tells me that Wisconsin Cartridge Company (who by the way is a one man operation according to my dealer) uses non-fired, virgin brass. So I'm not sure what the skinny is on that. I can tell you though, that I have two boxes of 38 Specials sitting in front of me as I type this and I pulled 4 rounds out of one box and each round had a brass made from a different company. Same with the second box of 38s. The boxes of 357s have always been assorted brass too.
As far as usefulness, I've never had a problem with either caliber. I've shot at least a few thousand of each and I've never had a misfire, squib, nor have they every blown up any of my guns. They seem to be good on accuracy: I can shoot about a 5" - 6" group at 30 yards, with one hand (no rest), but I'm not the greatest shooter in the world. I've never tried them with a rest to see exactly where they are shooting. I like them for practicing because of the price and I wouldn't hesitate to use them for hunting whitetail if I ever decided to use a revolver for the hunt.
My opinion is that they are well worth giving a try to see if you like them. I really like them and will continue to buy them. Also, I noticed that the company gets excellent feedback from the people who buy them on Gunbroker.
I understand that my review probably doesn't do you much good in terms of how the rifle rounds work, but perhaps it gives you at least a little insight about the company itself.
Best of luck,
Skunk