That is like asking what is the best car to drive! Highway miles or off road? Snow or ice? Same type of questions apply for what bullet: What animal do you want to hunt and at what range. Sabots allowed? Scopes allowed?
My take on the powerbelts for a conical is that they usually shoot great, but can come apart on game. That said, if you are hunting small/medium deer, you might be all right with that load. For a mule deer I would want something in the 300 gr range in that bullet. For elk, 350 minimum and 400 is better with powerbelts. They are also expesive.
I am leaving today to hunt for elk in Colorado. My load is 90 gr of fffg 777 powder and a 350 gr Hornady FPB bullet. It is a lead alloy (harder than powerbelts) so it stays together better when it hits something
Your powder (pyrodex) is fine, but as to bullets, it depends on what you want from them. I never shoot sabots, but the conicals I like are the FPBs, no excuses, bullshop bullets, hornady great plains. In the past I used the 405 gr aerotip powerbelts for elk, but feel like the others do some better and usually at a lower price.
txhunter58
venor, ergo sum (I hunt, therefore I am)