I would think it could be done, may have to ream through the action. Not sure on how it would be done but I know it can be. I have a Model 40, which is just a Single Shot version of the Model 25 (basically) that was only available in 22 Hornet. I bought mine used and the prior owner had it rechambered to 22 K-Hornet. Since the 25 is a repeater I am not sure how well the mag and ramp would allow the Improved case to feed. I know on mine the improved shoulder angle makes it difficult to load even on the single shot platform.
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