I loaded the 145 Shock Hammer in my son in laws .270 Winchester. It's one of the easiest bullets I've loaded for, 12 rounds to a working sub MOA load with meat on the ground.
1) Erase the board for what you have stuck in your mind.
2) Build a dummy round-just case and bullet.
3 Seat a bullet so it fits comfortably, but use available magazine space.
4) Place it in the magazine, and cycle it. If it feeds without resistance were home for now.
5) If there is resistance, and it's not from the case itself, seat just a bit deeper until it chambers easily.
6) Now you've got it seated its overall length from base to tip will measure about 3.3".
7) Primer
8) Charge 4 or 5 with the minimum load listed in whatever manual you are referencing. Likely 52 grains plus or minus.
9) Range trip, firing one at a time, check for ease of extraction look at base for unusual marking. If good fire a group with the 4.
10) At home look at cases again-think about your goals. If everything looks, feels good consider adding another grain and repeat.
I'm out.