Re: 2013 Dall/Grizz hunt
It would depend on the type of grizzly hunt. If you can spot from a distance and shoot, then you should use the rifle you feel the most comfortable with. If it is the type of hunt where you will be face to face with him, go large. The larger the better. Often times bears are spotted from a great distance and you have to get on their playing field to get a shot. It all happens fast and you could be face to face when it does happen.
If you do go with the Lapua, leave the SMKs at home. The 300 ACCUBONDS if available would be a far better choice for griz. If they are not available by then, the 250 AB or 250 Partition would still by far be better choices than the 300 grain SMK for griz. The SMK will be too unpredictable in a situation where you DO NOT want to leave any room for doubt. It could pencil through. It could explode. It could do a perfect job. You never know. Partitions and similar will be much more reliable than the SMK could ever dream of being. You will want maximum reliability while face to face with mister hairy teeth and claws.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.