I've seen a few American reviews of the Predator including that of one in 6.5 Grendel. As with other budget 'starter' rifles that sell for very low prices in the US, it shoots much better than the price point would imply. However, there were complaints about poor bolt/action finish on at least one test rifle - for instance the top cartridge in the magazine badly scored by serious sharp burrs left on the bolt body.
The problem for any UK importer of these budget US models is that after export-importation costs including ITAR compliance, mandatory proofing, screw-cutting muzzles, if needed, to meet the now near universal sporting user desire here to shoot with a sound moderator, retail prices are now no longer attractive for such basic models. I suspect that over in the USA where the market for budget rifles is so much larger especially as in the absence of a universal licensing system for bolt-action 'hunting rifles' they can be an impulse purchase, manufacturers and gunstore owners are willing to take tiny margins to get customers over the threshold often to talk them into buying something dearer, or to see repeat business as satisfied customers later trade-up. The larger dealerships can also make large orders that attract manufacturers' discounts given their huge sales volumes by UK standards.
So far as Grendel availability goes, we finally have the makings of some good bolt-action choices for what has been up to now very much a US AR-15 orientated number. CZ is offering its Cz527 MBR target model in this chambering:
https://www.czub.cz/en/cz-527-varmint-mtr.html
This doesn't look a cheap rifle and I've yet to hear of any centrefire MBRs appearing (the rimfire 452 based model is here now), so don't know if it'll be available at all, never mind in quantity at affordable prices.
What is here - I have one and was undertaking load development on the range a couple of days ago with it in fact - is the Howa 1500 Mini, the new super-short action model (1-inch shorter receiver and bolt than the standard 'short' action) restricted to a quartet of cartridges that are within the 2.26" 223 Rem length limit - 223 Rem; 300 AAC Blackout; 7.62X39mm; 6.5mm Grendel, mine being in 6.5G. With the basic HTI plastic sporting stock, prices are low - just under £600 if you shop around for the standard sporter variant.
Mine is the 'Varmint' model with a 20-inch screwcut heavier profile barrel (not truly heavy though, but for these four cartridges heavy enough) in the new MDT Oryx chassis, a really great combination. I've yet to see an RRP, but Brian Fox (Fox Firearms UK of Stockport / Diggle Ranges) is hoping to sell the Oryx models for under £1,000 once he has done a deal with the UK importer Highland Outdoors Ltd.
https://www.legacysports.com/catalog/howa/howa-oryx/
On the range, the Grendel is already showing it is a fussy eater - a 0.1gn powder charge variation can make a big difference. Most combinations I've used up to now will group under the inch at 100 yards (5-shot groups), I've found a few that'll produce half that, and managed a very nice 0.35" in my last session with the 120gn Lapua Scenar-L and Viht N133 at just over 2,400 fps. There are lots and lots of suitable bullets in the 100-130gn class and still plenty of suitable powders post-Reach. As US AR Grendel shooters report barrel life in the 8-10,000 round range, you don't have to stint on experimental loads and with its light recoil can shoot all day. A steady rate of fire of 20 or so rounds that would see a heavy-barrel 308's barrel quickly get too hot and necessitate a cooling-off stop, only makes the Howa's barrel mildly warm.
Components and dies are readily available (Lapua cases - expensive at £1.08 each, but very good quality and should last a long, long time - PPU at half that.) For the non-handloading shooter, 223 and 7.62 will remain cheaper and with good availability, but for the keen handloader the Grendel has to be a viable all-purpose number - economical, potentially capable of excellent precision, excellent external ballistics even with modest MVs in the 2,350-2,450 fps range. 120 and 123gn bullets remain supersonic to 1,000 yards. With suitable powders, the 20-inch barrel will also just achieve 1,700 ft/lb ME making it viable for deerstalkers nationwide - 120gn weight bullets need 2,500 fps. Even as the heavier match / varmint model, the little Howa Oryx would make a very handy field rifle indeed.