I'm wondering if you guys clean your 17s more frequently than your .22s. If heard the 17s shoot dirtier than .22. I've noticed my Anschutz 17HMR and 17Mach2 shoot better clean. I clean them about every 50-100 rounds; a good bore scrub. My .22s seem to shoot well almost without the bore being cleaned....I clean them anyway, but the accuracy rarely changes. Just wondering.