Originally Posted by
georgeib
As a data point I'll add my 2 cents. I only have a single 1:8 barrel in 223 Wylde. It came in a 16" PWS rifle that I have. According to Strelok Pro, the Barnes 70gr VOR-TX has a gyroscopic stability factor of only 1.33. The Barnes 70gr. VOR-TX bullets are solid copper and have a nominal length of 1.073", so I'm sure that's a factor. As it so happens that particular load out of my particular rifle groups like shit.
I can't remember the exact numbers, but I want to say it was around 1-1.5" at 25 yards. Badly enough that I wouldn't want to shoot any of it through a suppressor on that particular rifle, and I didn't bother with further distances. The same rifle will shoot 5 rounds of IMI Razorcore into a ragged hole at 25, and around an inch at 100. Heck, it groups m193 better than it does the 70gr Barnes..