I'm framing for a new window in an existing wall, and the left king stud bows out slightly. How can I fix this? My current plan is to place the new (straight) jack stud against the king stud, and add a shim between the two where I'm nailing them together to keep the jack stud straight. This would result in a small gap between the king stud and the jack stud, but otherwise both pieces should continue to function as expected. See the picture below for the king stud, I added a straight red line to make the bowing more obvious.
What you have there is not too bad at all. It will, if left alone and nail the jack stud tight to it, will only mean a larger rough opening, maybe a 1/4-3/8" at the worst place it occurs??? Not a biggie. Yes you can shim it straight if you choose to, make sure it is well nailed, 2 nails at either end, the bottom preferably toe nailed into the bottom plate, and the remainder nailed at least every 16" approx. in a staggered fashion. That is roughly 16" from the top and bottom, it can be closer, drive a nail favoring one side of the jack stud, then move another increment and favor the other side of the jack stud. If you choose to, you can double nail it all he way along the stud.