None that i can find. All the guys with the 50cal apex are either using sabots or powerbelts and shooting great groups. portable fence line, lmao. It would be a hell ofa lot cheaper than those shooting sticks thats for sure! We use that fencing with the square hole and i make a dent in the right hand bottom corner and lay my rifle barrel in there and its one of the steadiest rests ive used so far. But i have not read any bad reports of the apex or anything bad about shooting conicals. Every cva/bpi gun i have shot has always been pick one bullet/powder and you're ready.