both my cousin and I have a 17hrmrI havnt been able to shoot mine yet becauseim getting hte scope for chirstmas, im mounting a simmon prohunter 4-12x40AO on a marlin 917vs my cousin shoots a CZ american witah a tassco 2.5-10x44 AO i beileive. Ive had no experience with that scope but i have herd that there area few god ones out there but some are junk but thats just what Ive herd. go to this site theres lots of info on scopes and the 17hmr http://www.rimfirecentral.com/forums/index.php?