I would think a 100 gr Nosler ballistic tip would work perfect in that 25-45. They'll open down to 1600fps I believe. Wondering why you didn't go 25 TCU instead? Or is this in an AR (with mag length restrictions)?

I do like the 75 gr Vmax driven much faster (Roberts AI-mine) on coyotes, and I've been playing with the vmax in a 256 Win (necked down 357 mag) with promising results.

I played with a 6.8 spc years ago, and I think a Barnes 100 gr? Never did really warm up to that one, and built the daughter a 257 Roberts (Savage) instead (the 6.8 was supposed to be for her).