I TOO, like many others like TO shoot TWO rifles of differing cartridges. I prefer one hole groups because they always measure .000". This is because I pay attention to MV, ES, and SD. I take careful measurements regarding COAL and CBTO. I have never tried the OCW, however. My biggest concern is that POI matches POA. I have yet to see whether a FB performs worse than a VLD at mid ranges. The FB distance in my chamber is adequate for either. Sometimes I jump and sometimes I jam depending on bump. I am currently RUNNING a RBLPRE but a RBLPBE looks enticing as long as it has the original FP and spring. I still use a MOA scope over MILs because I shoot known distances but I like the ATACR and maybe SHV4. The CM is very popular, but for now I'm shooting AI cartridges instead. Of course it's hard to argue with PRC, RSAUM, or WSM. This useless rambling is to point out that acronyms can be hard to follow at times in our gun discussions. Just a little humor, here.