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 Sportsman 10 as I said is the rarer one.
They are also worth more is they (any model) have a Parker Hale 16 aperture sight fitted.
This links to BSA serial numbers BSA - John Knibbs International Ltd
The 10's serial number is prefixed with an L. Also check that your bolt's handle serial number matches the action's serial number.
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