There is a way. In Germany, for many years, a 8x57 JS reamer is run into the J chamber. This allows for more expansion at the neck of the cartridge, when pressure is highest. Many military rifles were converted this way, as well as 8x60 versions. The difference in bore size is not that critical, and bore sizes vary considerably. It's all in the neck dimension.
There is a lot of research material on thin, in particular with reference to the 8x60J to JS, and even the weaker actioned mod 88.
Try hitting search, on this very forum, for some reference to this hard fact. As usual, a lot of repeated stuff becomes 'fact' if repeated often enough.