This^ Hammer bullets acted a lot like Partitions except they are lead-free. They are the easiest bullets i have found to find an accurate load for, they kill game quickly with very little bloodshot meat, they are expensive but you get what you pay for.
I bought a bunch of 150g Accubond blems several years ago and they shoot great with IMR 4350. I've also used RL26 with those with excellent accuracy and more velocity. As mentioned above, lots of powders work well in the 280.
I retired 10 years ago, I spent most of my life deer hunting on horseback. Packing into the wilderness to get as far away from the road hunters as possible. My mountain horses have all passed and now I mostly hunt coyotes and target shoot on my 65 acres. I have a 100, 200 and 300 yard target...