Aww, max length is likely due to muzzle diameter. That’s good that you can go shorter! Just don’t let them talk you into a #4 countour or whatever other unnecessarily heavy contour they might try to sell to have a shoulder for large muzzle threads.
I've been using Shaw barrels (among other brands) for many years. I can't remember them trying to "talk" me into a different contour than ordered.
They also offer Remington factory contour barrels, not just their numbered contours.
The reason I mentioned the heavier contours is because smiths tend to be a little hesitant on threading barrels with thin muzzles, not due to a contour issue per se. The reasoning is to have enough shoulder for a good seat, as well to keep enough metal between the root of the threads and the bore. Have had multiple smiths bring this up. One way around it if going with a light contour to use a pressed on collar, or to have the barrel contour cut with a belled out muzzle, ala the 18” Barrett Fieldcraft.
Also, ER Shaw has the minimum calibers listed for their barrel contours on their site, and their heavy sporter is the minimum numbered contour listed to handle 375. By weight, it’s similar to other company’s #4 (specifically Lilja and Douglas).
Fortunately they do offer Remington contours, and their Rem mag contour will accept 375.
