by Bmt85 » Tue Dec 04, 2018 4:30 pm
I emailed Barnes shortly after the TSX came out, and those are the velocity number's they gave me. I also asked about the diameter of the 275 TSX being .4505", they replied that it was to reduce pressures, so it can be loaded to faster speeds, but they also said it wouldn't affect accuracy too much.
As to the range that expansion will occur, I have played with a ballistics calculator and it looks like you should get some pretty good range.
The 275 XPB at 2000fps, 0 elevation, and 30 degrees, you should get about 175yds with expansion.
2200fps at 0 elevation and 30 degrees, should get 225yds
2400fps at 0 elevation and 30 degrees, should get 270 yds
With the TSX, add about 80yds to those. From what I have seen around here, 2200 fps is easy enough with these bullets. If loaded long (2.33"or more) and leaning on it (Safely!), they are capable of going over 2300fps. Be safe working up that high.
I chose to push the TSX hard, and it has worked amazingly well, but honestly, you don't need to push these bullets hard. They open fast, and will penetrate a long distance. As cool as it would be to turn the 450B into a medium range cartridge with the TSX, it just doesn't have the b.c. to do it. Even if you pushed it to 2400fps and it expands at 350yds, the wind drift is going play havoc. Is it possible to shoot them accurately at that distance sure, are most shooters capable of it, I would guess not. I push mine to get the most energy of it, and so far, they have been great. They also seem to hold up just fine (no petal loss) when being pushed.