Tried out some of the butch's reloading 175gr hpbt 30 cal bullets in my tikka t3 varmint friday night and they shot well at 300m it was a windy day so groups were spread horizontally but held 1 1/8"- 1 1/2" vertical. I asked about the bc and they told me that they are sierra 2nds so I could use the Sierra data for them. Not sure other then not being as shiney as normal Sierra what made them 2nds. it's been hard to find any 175 and these are a little cheaper too.