I shoot a Striker in 7BR, a Target Action based pistol in 30BR and an xp-100 also in 7BR. The striker has two advantages 1) left bolt (I also use a single shot follower and load from the left) and weight. The Target Action is much heavier with a larger receiver, larger barrel shank and no magazine cutout. The advantage of the Target Action is trigger. The Striker is much better overall if changed to rear grip and any other trigger. I shoot both but like the Striker day in and day out.

Oh, I forgot the Striker is MUCH cheaper than a build from scratch.