I've had feed issues as well and found tuning the magazine was the fix for this rifle.I had a Ruger American Gen 2 Predator in 6mm Creedmoor. It's a great gun but jammed for me pretty frequently when cycling the bolt quickly. Might be just the way I cycled the bolt personally but make sure you're "straight in-straight out" without tilting. Or cycle slowly.
Never happened in the absence of ammo. Cartridges were getting hung up about 3/4 of the way down the base. If I was using a cartridge with more taper like a 243 it probably won't wouldn't have happened for me.
I got rid of the rifle. Still like the design and quality though. Your experience may be different.
Care to share your load data? I'm running 95 vmax with 30.5 of xterminator, 2825 fpsGen 1 predator 6.5 Grendel. Magpul hunter stock and eBay trigger spring and shim kit. Vortex viper 6.5-20 and harvester evo. One flyer, but the 80% group is sub .2 moa. 107 TMK @ 2690 fps