I'll repost here also. My brother has the 25 dti and is amazing. I would lean towards the 6mm cause the bulletchoive for deer is much better.
Dtech makes the uppers and I believe his name is mike. He recommended the 25 for several reasons. Cant remember why. Only problem is finding 25 cal hunting bullet in the 80 90gr weight where this case shines. He has ordered gs customs bullets cut to his specs after a long process with gs. Feel free to pm me as I will update you on how this works. Testing in two weeks on pigs