For me, anything longer than 10M is hit or miss right now. We've gotten into the 40's the last couple of days, clear and sunny, but there's still 6+" of snow on the ground. It was nice enough yesterday to shoot from inside my shop to the back of my property so I could rezero my Cyclone at 45 yards. But that created it's own problems, I was shooting through a major heat haze, ever try to shoot through a mirage? Still, I was able to keep CPH's under an inch at 45 yards. Just for grins, I tried some RWS R-10's, NOT GOOD! Don't know what the velocity was, but I couldn't keep 5 shots under 2". Of course, having changed scopes around today, now I need to do it all over again. But I'll at least try anything ya'll come up with. Later.
Dave