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I would highly suggest you look at the 460 grain Mt Nex conical. This conicals can will be built to slip fit your barrel - no need for a short starter. Much quicker in the need of a follow-up shot.
Dan uses an excellent lube which I also believe is extremly important in consistent shooting.
The 460 also meets Colorado's length requirements.
The accuracy is outstanding and it is consistently outstanding. Of course you can imagine the energy. I shoot it with 90 grains of T7-3f @ 1500 fps. I use a 6" point blank range projection to site it in. So at 100 yards I am approximately 2" high @ 100 yards and @ 150 I am down 4.87" - all of this allows me to aim dead on all the way through 147 yards...
Probably the most common bullet used in Colorado is the Power Belt - but I think if you get these Bull Shops and shoot them you will find they are superior to any PB.
http://bullshop.gunloads.com/contact.html