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That feed store must not grind it themselves. Find one that does, (you can tell when they have to towers/silos outside, near the buildings.) The ones that grind/mix the feed themselves can do it at whatever percentage you want. As for what Welp says about their birds, I'm sure they know what they're talking about, but you don't need to switch the birds' feed. It just becomes a pain to deal with, then you end up with too much of one, not enough of another, etc... So, if you're concerned about it, I guess go with what they say. Buy your birds will do just fine on one feed the whole time.
Don't get overwhelmed- it really isn't that tough to raise broilers. It's a bit tougher than layers, but not much- it's just different, so you can't look at them in the same way. Most of what you read here, or anywhere else, is OPINION- keep that in mind. A good book to read is "Pastured Poulty Profits," by Salatin. It's the "broiler bible."
Also, keep in mind that 1000 pounds of broiler feed will only cost you about $200, and doesn't take up all that much room. If storage space is a concern, you can probably get it ground 500 pounds at a time, then get more when you run out.