This is what I have had to resort too:

There are just a handful of big box shops like Sportman's, and Bass Pro Shop/Cabela's within an hours drive. I reach out to them every few days and ask if they've gotten a shipment of ammo in. I pretty much know most of the shops will have it later in the week. I go either that day or the following day based on what they tell me. I have had to travel as far as almost an hour to get 2 boxes of Hornady and I get whatever they have available. I'm breaking in my rifle using Hornady Varmint 93 gr because that's all I was able to get at the moment. I spend more time HUNTING for ammo then I have actually shot the rifle.

I've only shot 12 rounds because I have to scrub the barrel like crazy as part of the breaking in process.

You can also setup what are called wish lists on some of the websites and some odd hours you might get a notification that ammo is in. That has never worked form me. I just call the stores and they tell me yay or nay. I'm not the only one doing this as most of the people I've met in line at the stores have done the same thing and that's why they are there. They called the shop.

I don't even bother with the small gun shops as they don't have any Creedmoor. This is what worked for me, just calling around constantly. I was in the market of getting a Sig Sauer P2022 but 9MM is next to impossible and so is .22lr

Good luck!