I would absolutely not take my cues from what's popular among those particular competitors. They're extremely susceptible to hype, mania and pointless fads and racing money is their default behavior. I shoot competition a lot and I've seen the pro's getting their $10,000 rifle/optics combo having scores tied or bettered by joe-sixpack with a 1000 bucks worth of Savage and SWFA with increasing regularity. A Defiance action and Proof barrel on a $1000 chassis with a $3500 scope isn't the only way to get there from here. It's just the fastest way. I call that racing paper and it's not applicable to those on budgets that are limited.
If you want to be competitive at the local level while being budget friendly then:
1. Start reloading or you're wasting your money hand over fist.
2. Pick a 6.5mm-7.5mm rifle cartridge that puts heavy for caliber bullets out at 2600fps or better. That's good to 1000+yrds.
3. Pick up a scope that tracks (see my posts in topics about glass for good ideas about which are up to it on a budget).
4. Find a .75MOA or better load.
5. Learn to shoot / get a mentor / get trained.
6. Get your ballistics really dialed in (ask me how).
7. Train when you practice. Don't just rehearse. If you hit every time you're rehearsing. Make it harder on yourself and you'll get better.
8. Keep a log book of conditions and POI vs POA data. You'll want to thank me later for you starting to do that.
9. Get off your belly and on your feet. When you can hit standing, you can hit from any position.
10. Have fun. It's not worth it if it's just work.