For what it's worth, and it might help someone, I have been shooting 6.5 Lapua for about 5 years now. I have experimented with all sorts of bullets and have shot all species bar Chinese with it.
My standard load was R15 with a 120g Nosler BT. It ran at 2960 fps. Great on Muntjac, Roe and Fallow, both sexes and Red and Sika hinds. The Red Stags, especially if they were rutting, took just a bit too long to go down for my liking and I was never too confident with anything other than a neck shot on a Sika Stag, the other option being through the shoulders and I was never quite sure the quickly fragmenting BT was the best choice of bullet for that job.
On Muntjac and Roe a chest shot regularly made a bit too much of a mess. On most occasions when I have shot beasts squarely through the heart fragmentation inside the carcass has made significant exit holes, destroyed the front end and on several occasions punctured the diaphragm and made a bit of a mess.
Accuracy was always inside 1/2 MOA which gave huge confidence in shot placement.
Last year I switched onto a 100g Barnes TTSX which goes down the road at 3250 fps. The objective was to reduce the mess left behind by the Nosler BT on the smaller species of deer and give more confidence shooting through bone on Sika.
The rifle is now much flatter over normal stalking distances, damage is significantly less than with the Nosler and the beasts drop on the spot far more often. Only shot Muntjac and Roe with it so far but I am much happier with the result.
The only thing that worries me is the lack of fragmentation on a neck shot leaving less margin for error than with the Noslers.
I need more time with the load to be really confident in it, but all the signs are very good at the moment and the fact that it is shooting much flatter is a real bonus. I have no plans to switch to anything different. Accuracy is as good, arguably a bit better.
I have however turned to a 280AI for the Red Stags. Another stunning chambering. That is certainly man enough for the job. 145 grain TTSX at 3150 fps puts them down quickly and efficiently.
Hope that's of interest to someone.