When I started shooting a German kiplauf 5.6x35R (.22WCF/Hornet clone) with a 1-9" twist I had my eyes opened to the wonderful world of shooting really heavy (long) cast bullets out of a Hornet. 55 to 70 grain bullets are now my favorites- a feat I couldn't perform with a 1-16 barrel, and only marginally with 1-12 or 1-14 barrels. Makes for a superlative long range squirrel whacker.