That's a great powder and one of my favorites, but it's better saved for your 25-06 and use some 8208 or similar in the 6. You won't get enough 4350 in that small case to do it justice, too slow burning and too large of kernels.
Try Benchmark or 322, they are both extreme powders and close to the same burn rate. I'm running 8208 in two 6x6.8s but Benchmark would be my second choice for sure.