I have an American 270 that is truly a tack driver with the very first rounds touching at 100 the first time I shot it. Crazy for a gun I bought new in the classifieds for $300. The trigger on these guns are quite nice, surprisingly. Obviously YMMV, but pretty sure you won't be disappointed. The fit and finish is inexpensive for sure, but it's a dang good base regardless.
That rifle has an 18" barrel but a fairly fast twist rate. I would try Federal Gold Medal Match 168 grain rounds. I don't have that rifle, but I have a Remington 700 with the same length barrel but a slower twist rate (1:12). If I keep my shooting to 500 yards or less, it shoots sub-MOA with the Federal loads and my hand loads.
However, with your 1:10 twist, you can even go up to the 175 gr projectiles all the way up to 500 yards+ and stay supersonic (if I recall).
If you want to stretch it out further, drop down to the 150-155 grain projectiles and you can use it on deer and elk up to 400 yards.
I'd go for the non-predator version and get the longer barrel. But if you need a thumbs up generally, I bought a predator in 6.5cm... was impressed with it and immediately bought the 308 (non-predator, black stock). The 6.5 is no fuss and hits where it aims and is a ton of fun and killed two antelope this year. The 308 also gave me a sub minute group about the 5th minute into sighting in.
American Predator 6.5 cr, new trigger, muzzle brake, Walmart spray can paint job. Supper accurate for a little piece of crap and that goes for the same for all calibers , they hit a home run on the action and the barrels. I really beat this rifle up on my snow mobile.