Advice from a pro on the hill in Invernes-shire where they shoot many reds with a 6.5cm 'with 6.5cm copper you want to be breaking bone.' Another pro in Angus who uses the same calibre in copper 'aim where the neck meets the shoulder'
Putting then in line with The foreleg- err towards the frontside will result in bone being broken, which in itself will cause more damage. But the key hitting the shoulder blade will transmit a lot of shock to the CNS. There is a huge bundle of nerves under the shoulder blades, which connects into the spinal column. Giving these a big thump will knock out the system resulting in the deer dropping on the spot. In the meantime the bullet will have gone on to severe the heart, aorta and other major blood vessels. By the time the animal starts to regain consciousness after the blow to the CNS it will bled out due to the damage to the heart.
Difference between Roe and Reds is that reds are a lot bigger. A bullet causes a permanent cavity - due to bullet, but also a temporary shock cavity which four to six inches in diameter. On a Roe, that temporary cavity will cover most of the kill zone, on bigger deer not so much.
I was reminded of this the other day, by a red hind and good sized stag calf the other day. They clearly hadn’t read the rules, nor had I. I rushed the shots, with the hind the 7mm Fox bullet went in below the shoulder blade straight through the heart. The calf jumped on receiving the shot and went into a headlong run clearing a fence and went out of site. Meanwhile the hind had run 20 yards and staggered and fell over dead.
On gralloching, bullet had split the heart in two - she was dead.
Meanwhile the calf - found a big pool of blood in the bracken. Took a while to find (no dog with me) but it had gone down a gorge into a stream resulting in a 200m uphill drag.
Shot placement was a little far back but still massive bleed.
Would I have had a different result with a different bullet - possibly but probably not.
Would better shooting have resulted in a much easier extraction and me not loosing buckets of sweat and needing defribilation etc - almost certainly.
I made schoolboy errors and got my butt kicked.