I assume you are speaking of the SA Mastery line. Or are you speaking of the SA XLT? The 8/9 XLT will overload the rod; but the 8/9 Mastery is not bad on this rod. The 8/9 MidSpey or Long Delta or the 8/9/10 Windcutter or 8/9 Delta are fine on this rod. If you want the rod to be a little faster, use 7/8 mid-bellies or 7/8/9 Windcutter/Delta lines. The Scandanavian 8/9 or 9/10 lines would work too if you want a very short shooting head style line.
Remember, this is a slow rod that bends into the grip on virtually any length cast.
I would suggest a MS with tips. Either the 7/8 or the 8/9 . This rod does not have a lot of power in it so the 7/8 will make it seem faster than it is. If you like to feel the rod load deeper into the butt section with a slightly slower stroke then try the 8/9. Good Luck
If you are new to spey casting, go with one of the mid-belly lines like the Airflow Long Delta or RIO MidSpey in 8/9. If you have a few years experience spey casting, go with a mid-belly 7/8. And it is best to get the lines in the multi-tip version with sink tips included unless you have been cutting lines and making sink tips for a while.
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