I don't have a specific load for that bullet, but I have shot some 150 SMKs using Trail Boss. They were very pleasant to shoot. You might go to Hogdon/IMR's website and see if they have any load data for you bullet weight.
The Hodgdon site takes H4895 max load for the bullet weight and uses 60% of that for reduced loads. Works very well. No worries. I think you will be pleasantly surprised.