this is the info i was given when i asked the sam question
hop it helps
BST's are related to Nosler Ballistic Tips. BT's have had mixed results in the field over the years. Some great! and some awful. Some report horrendous meat damage, others have reported them acting like solids. Personally, I would not use BST's on game because I do have so many other choices that are more reliable. The coating is Lubalox, a material Winchester has used on bullets that helps reduce fouling. Here's a quote from Nosler:
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NO, Lubalox (CT Ballistic Tip) is an oxide-based coating, which reduces fouling and allows more shooting between cleanings, also Lubalox does not buildup in the barrel and requires only normal cleaning procedures.
If it is a non-magnum and the muzzle velocity is below 3000fps, you are probably better off.Magnum muzzle velocities put an enormous stress on bullet construction if used for relatively short shots. My 270WSM 130gr load is consistently just over 3300fps, hence I use a bonded core bullet. My 140gr load is the Barnes TSX, a very good tough bullet. With the TSX, I don't need a 150gr or 160gr load because the weight retention is so high on the TSX.
Another good choice of bullet genre for thin skinned animals up to say 400lbs or so are the newer series of polymer tipped bullets with bonded cores. e.g. Nosler AccuBond, Hornady InterBond and Swift Scirocco. I have developed a load with the Scirocco in my 270WSM that is just superb using Alliant ReLoder 19. Re22 & Re25 also work well with the heavy bullet for caliber combinations. Hodgdon's H4831 and H4350 can also work very well too.
