Re: 7MM RM and Berger VLD's
I went from 73 to 76 grains during load development with CCI 250M primers. MV went from 3065 fps to 3165 fps. Everything held together OK.
I eventually switched to Federal GM210M primers and lost some velocity with equivalent powder charges, but I reduced my Extreme velocity spreads and SD substantially by going with these Federal primers. I settled on 74.9 gr Retumbo as the best charge in my rifle.
My powder load isn't a powder puff so I would work up from a lower starting charge weight and see where you can go. But my case life seems to be good with 74.9 gr Retumbo. To answer your question, I'm not experiencing signs of overly excessive pressure in my rifle.
My cases are Federal 338 Win Mag brass which I have necked down and outside neck turned for my 7mm Remington Mag. I did this so the loaded case necks will have a little less space in the throat of the factory chamber. I'm pretty meticulous about my reloads. Using Redding neck bushing competition reloading dies and checking all loaded shells for concentricity. They're almost always less than 0.001" runout. Most are less than 0.0005" runout on my RCBS concentricity gauge.
Last weekend I put three shots into 0.36 moa at 988 yds with this load. I was really impressed for a factory rifle. The Bergers reduced my group size in half, compared to the Nosler 160 gr Accubonds. And those ABs shoot pretty darn good all in themselves.
I have two Tikka T3 Lites in 7mm RM. The one gun loves the 168 gr Berger VLDs. The other does better with 160 Nosler Accubonds.
Enjoy yourself and I hope you end up with a tack driving combination.