I've owned 3 x M55's all in .243 and still have one. The one I still have I bought in 1979 and it's on its third barrel. I've never encountered the problem that you have but tried ejecting an empty case several times at different speeds tonight; by opening the bolt very slowly I managed to get the empty case to drop back into the magazine well, in other instances it contacted the scope on the way out but it ejected without any complication. This doesn't necessarily mean that your rifle doesn't have a problem, but hopefully it's a comparison of some value. I've used Norma, Federal, Winchester, Remington factory ammunition and reloaded the same with no memory of any problem as depicted. Rifle currently has Talley medium 30 mm rings but through most of its life had the 1" steel OEM Tikka's just like yours.
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