Last answers are clearly judgmental and random.
I didn't say I would spend 0 to obtain the best. I said I wouldn't waste money on something I don't need to. So, stop putting your judgment like "you should use the most expensive components any time", that's my right to judge. You can explain whatever you think, but saying that's what one has to do is NOT the right answer and this is objective.
This will be my one and only post in this thread, because arguing on the internet is like mud wrestling with a pig. You both get dirty, except the pig likes it.
You've gotten good advice here. The bullet manufacturer is just plain wrong.
No one has suggested that you use anything. Everyone has said it's a bad idea to train, and then compete, with different components. Do what you want.
No one has said you need to buy the most expensive bullet. They've said that JHP have historically been the most accurate, and that you won't get the same accuracy with hardcast, coated, lead, or plated. Use what you want.
Based on US pricing, the difference in powder cost between the cheapest, and most expensive, powder is roughly 1 cent a load. If you shoot 10K rouds per year that's $100. It makes no sense, to me anyway, to develop two loads with different powders to save $100 bucks. Do what you want.
Find a load that will give you the accuracy you seek at a price you can afford, and go with it, or not.
Good luck.