All my testing involves wet sand barrels with 8 layers of denim on top. While not a test of expansion (I leave that to the gel and newspaper tests, or the good ol'fashion way, go get me a javelina), it does test clogging. I have found that the Winnie White Box is pretty good in all respects (a little high flash maybe, but above great in all regards). UMC is a nightmare in smaller calibers. When I loaded for 9x19, I noticed that the only way for the 115gr. UMC component bullet to expand and not clog was to speed it as fast as it could go (1250+) and even then, fragmentation, as mentioned above. Larger calibers, such as .40 and .45 are pretty darn good for not clogging and consistent (not extraordinary HST tacticool) expansion. The component bullets from UMC I would not trust to other than plinking or similar, however, the Winchester WB and its associated components are top notch in my opinion. I concurr with Josh's 147gr test, they are remarkable (waiting for the old school, 147gr doesnt expand, crowd to come and thump my skull
) for the cost.
All in all, I would trust my life to WWB and buy it consistently for "strategic reserve" use. I understand and have ordered MUCH MUCH cheaper and "effective" ammuntion from Ammo to Go, however, I do not put my trust into it as far as one issue: Supply. While the pricing is lower, I would not put my entire trust into their "consistency" of supply. I dont want to buy a box of something here and there to build a supply, then they run out. I am OCD in my ammo concerns, standardization is always paramount to me. WWB will pretty much always be around, not to mention being available at pretty much any time. But thats me
Incidentally, Ammo to Go has awesome deals of Federal Classic Hi-shok ammo, while not as cool as HST or Hissie Fit, what ever the newest craze is, it has worked for police departments for decades and are proven designs.
I look for ammo to deal with problems, not problems to match ammo to.