I really should have tested that 300 gr A Frame, as a fair amount of questions are asked about it here and there in our forum. It looks like the 240 gr is tough enough, but can't answer the comparative to a 300 gr Swift question. It would change the character of the 444 as any 300 gr load does, meaning it was originally designed after the old black powder concept of an Express Cartridge, a light for caliber bullet moving fast. Which is not to say anything negative, the heavy bullet 444 load can work great depending on which one a person chooses for what purpose. My next venture is going to be looking at 348 loads, but do not know when it will actually get done, probably just before deer season.