I like it for the 28 gauge. You'll find others who won't use anything but Unique. I shoot with some very good skeet shooters, and while three of us on the team like the 20/28 for the 28 gauge, the other two won't use anything but Unique in both the 28 and the 20 gauge. Those of us who use the 20/28 feel it has a burn rate and zip similar to factory 28 gauge shells, but everyone will have their own opinion. These guys shoot 100's in both gauges all the time registered shooting, and the targets don't know the difference when they break, whether it's Unique or 20/28. I would think Alliant might know a thing or two about powder, and they really market it aggressively. If you already have it, find a recipe and load some shells. You won't be disappointed, but be ready for a few different opinions on the subject.
20/28 was developed to take less space in the hull than Unique. I have used several 8 pound containers of both in the last few years and can tell no difference in performance. 20/28 works especially well in AAHS hulls which have less internal volume than other brands. 20/28 requires a bushing several sizes lower than Unique to throw the same charge weight. A scale is required to check bushing drops with each change in powder lots.
Skeet2day, you are wrong. With a MEC loader, a #13 bushing drops 14.7 grains of Longshot (1200fps), and a #14 drops 15 grains (1225fps).
With 20/28 it takes a #15 bushing to drop 13.0 grains (1200 fps). A #16 bushing drops 13.4 grains of 20/28 (1225 fps).
With Universal Clays, a #16 bushing drops 14 grains (1200 fps).
Last time I checked, a #13 bushing was smaller than a #15 bushing, thus 20/28 takes more volumn/powder than Longshot to get a 1200 fps load. These bushings were checked on 2 different scales, multiple times. I use Longshot on 28 gauge loads with HS hulls, and Universal on 20 gauge loads, and old 28 gauge hull loads for hunting. All Win.AA componants.
I believe it is little less bulky than universal. With the short AAHS 28 gauge hulls, It is somewhere between difficult and impossible to crimp with a AAHS wad and 3/4 oz. shot using Universal and a 1200 fps load. With 20/28 you can get the darn things to crimp. It is very close to Universal - but slightly less bulky. I believe it is more bulky than Longshot - but I don't know how much.
I have started using it in the 20 gauge as well. I like it fine.
I did not mean to start a piss'n match. My point is that since 20/28 was designed to work with the HS hull, I expected to see a powder that was even less bulky than Longshot. I also shoot a lot of 28 gauge, not 12,000 a year, but I load enough to know that wad pressure is hard on the case life. The new, shorter, AAHS wads sure help get a good crimp, but I know many 28 gaugers that were frustrated with the HS hulls.
I wish winchester would of stayed with their original hull design as there no reloading/volumn problems with the old hulls.
I bought 20-28 because it is less bulky than Unique and Universal. I had problems crimping Remington 28ga hulls with 3/4 oz of shot without crushing using either Unique or Universal. I can get them crimped very nicely with 20-28.