I have a SAKO LH Finnbear in .375. Fabulous rifle. I suspect one could fairly easily be converted to .416, but though I have nothing against the .416 and it is a really awesome cartridge, if I found a .375 SAKO in an LH version and it fed and functioned just fine, I'd leave it alone unless you are 100% certain about the skills of your gunsmith. I'd rather have a dead reliable .375 than a converted .416 that might be.