Re: 375 in a SRS?
Maybe. The first thing to consider for SRS conversions is: will it work with an existing SRS bolt? Only DTA makes these and currently they're available in .243, .308, 300WM, & .338LM. If so, then you just need to spin a barrel for it and install an SRS barrel extension and you're golden. Magazines are another story.
If it doesn't fit the bolt, then the question is can the bolt face be opened up a bit to support it? This is questionable and definitely one worth calling DTA about.