I'm having a 300 WSM Tikka made into a 6.5 PRC right now. Rig is currently at the shop. I have a full length bolt stop in it and I feed it with MT long action mags.
It shot 200 ELD-X fine at sea level with the 1:11. Just rarely used it as I have several other 300's I like better for various reasons. Didn't have a 6.5 PRC, so thought I'd give one a try. Keeping it light. We'll see how I like it.
Overall, I consider myself more of a 7mm guy and have a couple, including a TIkka 7mm rem mag that has been modified for more COAL. I like the idea of a 7mm SAUM or WSM in a Tikka, as I think they are a great fit for short mag cartridges, but I also like chamberings for which good factory ammo is readily availble, as I like to pull the trigger and I don't always have time to reload. Thus, I figured I'd go 6.5 PRC.
When my 7mm rem mag Tikka needs a new barrel I'll likely go 7PRC and switch back to factory/MT length mags. Likewise, if Tikka chambers 7PRC, I'll pick one up.