I have now worked up a load for the 7x65R Heinrich Munch combination gun. 160gn Speer soft point over 52g of IMR4381, with an overall length of 84mm which keeps well under 1 inch, but only if I shoot slowly and barrel is cold between shots.
Having a thin barrel it does heat up and cool down very quickly, and if I take a 2nd shot without waiting for the barrel to cool it is going three / four inches high. I fully expect that shooting quickly bullets will group quite widely, but just wondering if other loads may well group a bit tighter from warm barrel. Can anybody cast any light on this?
Would dropping down to a lighter bullet weight - say 140 gn help?
Fully appreciate it for what it is, and that in 95% of times one shot is enough, but when shooting female deer you often have to take the following calf at the same time, thus requiring two quick shots.
Last edited by HeymSR20; 10/25/09 09:00 AM.
