Re: i want to build a long range hunting rifle, but i have some back problems
The 6.5x55 is considered THE moose cartridge in Finland. It is extremely accurate, mild in report and recoil and because of its' high sectional density it penetrates deeply. You do not need a cannon for long range moose hunting.
On the subject of back injuries, my dog is bigger than your dog. I had a compression fracture of T10, Kyphoplasty to repair it, contracted MRSA infection, 3 surgeries, 5 months in hospital, T10,11,12,L1,2,3 all fused into one. I cannot bend at the waist.