Well, not much of a choice anymore, looks like. It's been several years since I used the 175s, but they're not even listed anymore. I probably still have a box of them around here somewhere, to get the data from, but I'm pretty sure they were a .505 G1 BC.
The new stuff blows that away. The ELD-Match is a .547 G1, but the ELD-X is a .552 G1. Now, there's just a 178 Match with a .530 G1, which is what probably replaced the 175 Match. When I used the 175s, They came out with the 178 Match, and I made the switch, because of the BC improvement from .505 to .530. Years of use. When they announced the 178 ELD-Match, I almost switch immedately, but I had several hundred 178 Matches to burn through first. By that time, they introduced the 178 ELD-X, and I did switch immediately. The jump from the .530 to the .552 was a difference you could see at 850 yards - the dope charts were different. Click it, it gets bigger...