After much experimentation with FX Dreamlines and other Crowns with ho-hum accuracy, I finally got some really promising results with my FX Crown MKII Saber Tactical. I had a .177 600 mm barrel that I tried in another Crown that didn't seem to work well for me, so I put it in the Saber model that I was using for 100 yard shooting in 22 cal. I left the reg setting the same (140) and installed a Huma dual transfer port. I was able to squeeze 1020 fps from JSB 13.4 KO slugs and over 1100 fps with 10.3 slugs. I also tried NSA 12.5 and 15.0 gr slugs. The KO 13.4 gr worked the best when I turned the power wheel from Max to the next lower setting achieving 985 fps. The other slugs were not too good. At 100 yards, methinks this works pretty well for a .177 rifle. I can't wait to try some ZAN 13 grainers too.