Well, funny you should wonder. I considered trying flounder' bullet in the X7, but i didn't want to go through the hassle of changing aim of the scope. This morning my curiosity overcame my lazy, and i ended up in the hills shooting flounder' bullet in the X7. It was difficult to load in the tight barrel.
The target ended up at 47 yard. Five shots were taken from the X7 using flounder' bullet. First shot was a way high, so the elevation dial was lowered 12 moa. Then 4 more shots taken. Load was 85g BH, the 499g bullet with wad, and it was ignited by W209 primer.
After five shots with the 499g bullet, it was obvious it wasn't going to work in the X7. Just to see if the rifle was still working OK, the elevation dial was returned 12 moa up. The rifle was loaded, and shot 3 times with 100g BH, 300g Deep Curl, crush rib sabot, and W209 primer. Those holes in the target are dyed green. It was very windy, 65 degrees, and elevation was 4700'.
One might say my Omega can't hit a barn using flounder' bullet.