The 275 XPB is identical to the 200 XPB on the front end. Its just longer on the back end. Weighing more, the 275 will bleed off velocity slower even though it starts out slower due to its extra weight. Drifts a little less in the wind too. If an XPB at 1500 fps doesn't expand much in jugs of water, the 275 at 1500 fps will not either. Experimenting with Barnes bullets is never a cheap endeavor. My PITA LabRadar does one thing very well with these fat bullets. It tracks their velocity accurately until they hit the target board at 100 yds. I am planning an outing for this weekend to retest the 200 XPB over Lil Gun since things seem to have changed since I did my first experimenting with them. I don't have many 275's left so I might as well use them up since I'll never be hunting with them anyway. I can get some 100 yd velocity captures and from that, we can work the results backwards to an actual BC. That should give you a good idea how far beyond 100 yds you can go with them starting at a particular muzzle velocity and still expect them to expand. It goes without saying that a deer or hog is a lot different than jugs of water. If you catch ribs, shoulders, cartilage plate, etc on the way in, they will expand a lot more at less velocity.
Hopefully the weather cooperates like it did last Saturday morning. Too bad I spent 3 hours of it helping an 85yr old club member work out issues with his neglected pre-64 Model 70. Being a considerate troubleshooter at heart has its downside.
Hoot