I am left handed too. Have owned everything from 22RF to 460 Bee in Left Hand. Have also owned at least one, and in the case of Remington, Sako, Tikka, Weatherby and Savage many versions, of every make that produces left hand rifles off the shelf. Pretty much everyone one was good to great. Some took a little more work than others to get to the accuracy I wanted. Any gun I couldn't get to 1/2 MOA got sold, but there were very few that I ever had to sell for that reason. I never found on that I couldn't get to at least 1 MOA. Of the ones you listed, I would pick the Weatherby. Fierce that are still made in Canada are a good rifle, the ones made after the move, I don't care for. I would also avoid Bergara.
If you are open to custom there is a whole other world of options. My main hunting rifle for many years, is a Melvin Forbes made NULA in 308 that he built for me about 20 years ago. Total weight with Swaro Z5 3.5x18x44, sling and 4 in the mag is 6.1 LBs. Up close for dangerous game, Marlin in 45-70 and a Ruger Stainless Guide gun in 375 Ruger. For Long distance hunting, depending on the game, I have a K.S. Arms built 338-378, a Factory Remington 7 RUM plus a Weatherby Ultra Light in 257 Bee. All are Devcon bedded, and using tailored reloads, all will consistently shoot 1/2 MOA. The only factory rifles I have re-barrelled are due to wearing out the original, and some Savage and Remington actions I used to build stuff on.
For about $2,500 U.S., K.S. Arms will build you a tremendous long range rifle in left hand and any chambering you can think of. They have everything in place to ship to the States. Hope this helps.
K.S. Arms is a family owned business located in Edmonton, Alberta, Canada since 1991. We manufacture our own premium cut-rifled barrels and custom actions, as well as offer re-barreling services & custom full rifle builds. We offer & ship our products all over the world!
www.ksarms.com