All most all the bullets on the market today are good. I use the SST and SW my self and have never had a problem, I some time wonder why some people do have problems. I personally believe that the powder load put behind the bullet is often at fault, there are a lot of people shooting muzzle loaders that only have a year or two experience and they do not always take the velocity the bullet was designed for into consideration when choosing a load.
I have used SW and SST bullets for quite a few years and never had a problem, sure there is always a chance of a factory mistake that's true of any bullet but in the real world it has never happened to me or to anybody when I have been around. If you are going to be shooting the SW or SST between 1800 and 2000 FPS you will be fine if you are going to be pushing them from 2000 to 2400 FPS then use Bonded SW's.
If you are looking for the best buy for a really good bullet for deer then look at the Gold Dot 250 gr. Is it deer or something big we are talking about?