You don't mention which model.
There are essentially no readily available stocks for Rosses, apart from take-offs salvaged from scrapped rifles.
You might be able to get an uninletted synthetic stock blank and have it inletted to suit. The blank would have to be the correct external size to accept the barrelled action. Robertson composites might have something. It would be a lot of work, and I seriously doubt if it would make economic sense.
Similarly a wooden sporting stock could be made from a blank.
A 1910 pattern would be less challenging than a 1905, but neither would be easy.
There have been ongoing discussions about having replacement stocks carved, but I am unaware of anything becoming available.
Years ago, I bought a semi-finished 1910 sporter stock from Don Robinson. I believe he sold his patterns to Wilson in SK.
Unless the barrelled action is in superior condition with an outstanding bore, repairing the existing stock is likely the only practical option.