Re: Tikka T3 lite, should I put anything onto it?
You have an excellent 600 yard rifle. Why do you want to change it? I have one just like it and love it. I shoot the 150 grain E-tips, .469bc, at 3400 fps and it is deadly on deer to your range. .75" at 100 yards is goos but doesn't say anything about how it may perform downrange. I never shoot that close. If you want a 500 yard rifle then shoot it at 500 yards or at least 400. You can't tell anything about a rifle at 100 yards. You may shoot just as good a groups at 300 as 100. Give the bullet flight enough distance to settle in and see what it will do. What you have is as good as the ones you listed so I would not change it.
Predictions are difficult, especially when they involve the future