Mike,

Yes I would think you are pushing the bullets too fast and the barnes X bullets is not going to fix your problems. I had a client last year with a 300 RUM and barnesX bullets 180 grain at 3200 fps on maybe only the eland out of the 8 animals he shot did the bullet open up on the rest of the animals the bullets folded in not opening up.

If I was you I would maybe opt for a heavier bullet to slow down the speed and make sure on penetration and the line. I know you don't have easy access to Rhino bullets but I bought a couple of boxes for CCHunter to give to him end this month 380 grainers. The owner of the shop showed me two bullets one recovred from a blue wildebeest and the other from an eland they expaned perfectly with making a diameter almost 3 times the bullet size and that was at 2200 fps. I'm sure you would be able to push those 380 grainers at 2350 jps and that is perfect bushveld velocity.

Maybe you could try the 350 grainer from woodleigh as well. I would say either use a heavier bullet or slow down your loads to 2600 fps at 2600 fps you are looking at only 10-12" drop at 250 yards roughly, with a 300 grain bullet. And how many shots are you going to take at 200 yards ? Bullets do weird things if you push them that is why even BarnesX guaraantee their performace at max of 2800 fps.