Maybe you should participate in NigelM's survey of lung shot deer reaction with your 243 performance and help provide some detailed statistical information to make an informed conclusion about the killing performance of your choice of projectiles and distances . When you give Nigel your results let me know and I'll follow up with him so I can compare the 25/06,270, 308, 30-06 and 300 Win Mag with your 243.
Id love too but I don't heart lung shoot. I dot need too as theres no long range stuff on my permisions. Youd struggle to get a shot longer than 100m with 90% being 50m or less. We have one field which offers well over 100m but then back stop becomes an issue
Head and neck only 70g BT. Looking at my cull history with my 243 I have only H&L shot 8 deer and 51 head shot
Performance wise its been instantaneous drop to the ground 100% of the time with head shot
With a 243 I use 100g Power Shok. All of them except two ran between about 5 -10m. One droped on the spot and the other, a Roe off sticks, ran and I never found it and didn't find a blood trail. I searched the apx 100 acre site for that evening and most of the following day and we had a dog out but no joy. Other stalkers and the land owner never found a carcuss. It was a rushed shot off sticks on a roe that suddenly stood up, so the beleife & hope is, I missed it
H&L 243
I shot one fallow with Willowbank (bout 50m?), that ran about 10m Hit the heart
I shot a Roe with Geof of then Geof and Robin fame (bout 150m off sticks) ran about 5m Hit the heart
I shot a munti 160 kneeling with Mark Deerstalking England, that dropped on the spot Hit the heart
I shot a fallow doe with the old DAGS group at about 70m which ran apx 10m Hit the heart
I shot fallow doe 90-100ish m with a 70g BT again ran about 10m Hit heart but only just nicked it so main damage was lung and internal carnage was massive.
That's it that's ALL my H&L shots on 243
I shot three Fallow H&L on DSC2 with 308 150g Sako Hammer head
1 Ran about 5m Hit the heart range maybe 30m
1 Ran about 10m Hit lung but had to aim a bit high due to grass range 150m off bipod
1 bad runner/bad shot. That was found alive about 10m away and it ran again and was finaly found unable to move and dispatched about 50m-70m away and had been shot in the liver. 175m off bipod according to the range finder.
90% of the reason I don't heart and lung is I don't like to see shot anamals running off.
Soon as I gave up pro stalking I switched to head only with one exception when I took an a very tricky shot through a small gap in dense trees on a fallow and used the 70g for a heart shot due to the difficulty. End result was a dead deer but the internal carnage made me decide id never do that again that was the nicked heart shot listed above.
Open hill Scotland I took the 308 expecting long range heart shots.
I have two rigs. 243 with a heavy laminated stock designed for accuracy over everything which I use for high seat head shots and some close range stick head shots. 70g BT at 3546fps for maximum carnage on impact
Then I have a light weight 308 rig I use for walk and stalk using Sako Hammer Head soft point 308 150g
308. I have only had one runner who made it past 10m from the shot point and that was strangly with the 308