.277x68 Schuler Imp using RWS brass? I have a 6.5mm and have though about making a bigger caliber. It's basically a beltless 300wm using RWS brass so you can lean on it pretty hard. Brass is not always available but 100 rounds would wear out a barrel pretty easily.
Not sure I am worthy or should be allowed near RWS brass lol. Always a dream to run RWS brass and I have twiddled with the idea for ages. Will check it out.