I haven’t noticed any extra work or fouling with TSX or TTSX bullets compared to other bullets. What do you mean by “discoloration”??
When shooting copper consider the minimum velocity requirements.
Min Velocities are as follows.
150gr TSX- 1800fps
150gr TTSX- 2000fps
165gr TSX- 1800fps
165gr TTSX- 1800fps
168gr TSX- 1500fps
168 TTSX- 1500fps
I shoot the 168gr TTSX, super accurate and expands as the lowest velocity.
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I run 150gr Barnes in my 308 for hunting. I would feel confident with them on lung shots out to 350 yards, where impact speed will be approx 2000 fps.
"If you ever go into the bush, there are grizzly bears lurking behind just about every bush, waiting to pounce, so you need a powerful gun, with huge bullets" - Gatehouse ~ 2004
Ballistics can be broken down into three classes, internal, , flight and terminal. Lead bullets are more dense, so they fly better, making them better long range bullets. Because lead is softer they can have a greater range of impact velocities. Let's face it, we want to blow holes in game, this what kills them through blood loss. And quickly too, it saves their suffering and our tracking. Where copper has the advantage, it's easier for the manufacturer to make a bullet with less voids, thus better accuracy. Just don't allow your California Condor to eat lead bullets.