I think you would do much better going to H&R classified here, and swapping that .35 Rem barrel for a .44 mag or .357 barrel.
The .35 Rem case is larger in body than the legend, and would be impossible or nearly so to convert, since the legend is 35 cal all it's length, and steel would have to be ADDED..
1) .357 or .44 mag ammo are easier to find than the .350 legend.
2) If you wish, you could then rechamber the barrel to the .357 Maxi. or 350 Legend.
3) Personally, I have found the .44 Mag more than adequate for any big game in the northeast, having killed several deer with one.
4) A look at the case below, will show that the .35 Rem case swells wider than the legend..
I bought a rifle in .450 Bushmaster, but found I should have stayed with the .44 mag for a straight case, I can't imagine these super straight case in an H&R..as being comfortable. Here is my recent post;
https://www.gboreloaded.com/forums/index.php?topic=296722.0