Yes, it was N-133 that I mentioned.......
right now it is hard to find. The 223 is so versitile with most other powders that it is hard to choose. 748 is one of my favorite powders because it is so easy on barrels. Just about any 223 will shoot 26.5g of 748 with a 55g bullet into tiny groups. Also, with 27.0-28.0g of 748 with a 50, you will shoot very tiny groups.
The other favorites are Benchmark, H322, 2230, and XMR 2015.
I saw Ole's and Paul Workman's posts some time back and I bought a 2 lb'er of 133. The N-133 and has simply amazed me at the speed and accuracy. In my rifles, I am getting 100-150 fps faster with extreme accuracy Compared to Benchmark, H-322, and 748. Up until I had found the 133, I was sold on the Benchmark for the extreme accuracy, and on the first trip to the range (I load at the range) I found a load with the 50 shooting bug holes at 3600 out of a 26" Custom 223. It may not seem like much, but at 400 yards, I shot 17 of the 2 3/4" clay pigeons without missing. I felt as if the additional speed had extended my effective range of the cartridge and gave me a small additional edge on the wind. Next, I went to the N-135 with the 55g Ballistic tip. I got 3500 fps with extreme accuracy which is excellent yote medicine. Now the bad news, the cases are very full of powder and loading is slow. I weigh the charges and use a MTM powder funnel that has a 6" tube on it. This is bad news for guys that have the little patience.
Hodgdon has bought the distribution rights to the vit line of powders and we will all have more of the Vit powders very soon.