I have an original ( i think) Just One, now called the J34. It comfortably takes my long range rifle, 26" barrel 4.5 -14 x 40 scope. When I push the rifle right down into the scabbard it goes right down past the bolt handle and trigger guard. I think a 50mm objective and 26" barrel might be a tight fit though, although if you had a longer barrel it would stop the trigger guard going inside the scabbard and probably give you more room.
Try searching on longrangehunting.com there are some threads on there about what rifles will fit in the scabbards.
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