Tough decisions!!! Any idea what your goal weight is? And are you set on a 300wm?
I don't have any 'uber' lightweight guns. I did built a Rem 700 in 7RUM with a Edge fill mcmillan, proof sendero lite 26" and APA brake. It has BDL bottom metal and wears a nightforce NXS 8-32 and with 3 rounds loaded Im closer to 10lbs than 9!! It is hard to get guns uber light. I could trim some fat on the scope and rings but it shoots and handles great and most folks grab it thinking it'll weigh 15+ and it's great to watch their face as it almost floats away!
I don't own a Tikka but isn't the main issue with them the OAL of their magazines for seating out long bullets and they have some odd twist rates for cartridges. I think to get a stock made for a lefty Tikka would probably take forever too.
I've been in the same mental debate about a real lightweight gun and if I'd be willing to get a right handed Kimber and save the $2500 difference that it would cost to get a custom left gun built to 5-6lbs.
