Sako P54 - feeding

I have had a Sako P54 (original/older 22lr) for quite a while now.
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Mine came with a ten shot magazine (only) which has never fed quite as well as it should. It especially doesn't like the last round which almost inevitably jams the action.

Does anyone out there have a P54 - how do you find its feeding?

I have tried (within reason) playing with the follower, spring and magazine lips in mine.

And does anyone have a 5 shot magazine they could spare (wishful thinking I know!).:)

Thanks.