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Probably the spring is getting a bit sad. Does it feed the last shots OK?
The 10 has the tube mag extending sorta 2/3 along the barrel whilst with the 15 the mag goes almost to the end.
The...

Bit confused mate. You say a Sportsman 10 but then go on to say it has a 12 shot tube mag.
The Sportsman was made in single shot, 5, 10 (the rarest) and the 15 shot.
The 15's come up regularly on...