I am a leftie and all my bolt rifles are RH, simply because when I was a poor student I could not afford a LH bolt version. What that did was teach me to use it basically as a single shot and make the first shot count. I did buy a Ruger 77 270 in LH but found it hard to use. Also from the bench or prone position a RH bolt rifle is much easier to use for a leftie, think about it.
But a shotgun is different, my Perazzis both have LH stocks, a revelation after years of contorting myself around B25 Brownings and Winchester 101s wirh RH stocks
Mike