I'm using the same bullet and powder as you in my Whelen. Accuracy is excellent, as is velocity. I took a fair size bull elk a couple years back with that load. Elk was around the 250yd mark(lasered after), complete penetration on a lung shot. When we skinned him out it look like somebody had pushed a 2" pipe right thru him, it was almost a perfect circle, I was impressed, but........................when we were loading him in the back of the truck, the bullet jacket fell out. Obviously the load performed, but the bullet still seperated. I'm still using the same load
, if that helps any.
I read a post on CGN about this exact bullet, and the fellow had tested it extensively and found that for whatever reason at around 2100fps the bullet almost always shed the jacket, above or below that it always held together. I can't remember what the test medium was, but those were his findings. I suspect for a low cost bullet the Hornady Interlock would be better, but my gun shoots the Speers into little groups so that is what I have stuck with. I tried 225g Partitions and my groups were around 2.5-3". Good luck with whatever you choose.