I hunt close to home (practically in my back yard), so my "back up" rifle is sometimes my Krieghoff rifle/shotgun combination gun with a full length insert barrel in the shot barrel. The primary rifle caliber is 7X75SE vom Hofe, so I'm good on long range shots, and the insert barrel is in 6X52R Bertschneider, a .25-35 necked to 6mm. I haven't had the opportunity to use it on deer yet, but I'm still looking for one. My 5.6X52R (22 Savage Hi Power) Model 99 Savage is sudden death on deer, so I'm confident the 6mm cartridge will work just as well, if not better.