The best practice I do for "sporting clays" is Skeet.
I normally shoot 4 - 6 lines of Skeet per range trip / so 100 - 150 shells. Then we follow up with 1 or 2 rounds of Skeet Doubles at stations 3, 4 and 5 so 50 more shells there.
If I practice more than 8 rounds a day ( or 200 shells ) / I find mental fatigue sets in ... and its lead downrange, but it isn't very productive. I don't shoot more than 1 or 2 days a week.
I don't find 5 Stand to be very good practice for sporting clays / although the target presentations can be similar -- 5 stand shots vary so much from station to station / its harder to groove your fundamentals at 5 stand vs Skeet where you get a lot of repetition ( stance, gun mount, focus, foot position, break point focus, follow-thru, etc ). 5 Stand is fun / I just don't think shooting 200 5 stand targets a week is the best practice / at least not for me.
When I was preparing for big tournaments / like our state sporting clays tournament - I would shoot 2 lines of regular Skeet, 2 lines of Continental Trap (with my Skeet and sporting clays gun - not my Trap guns ) and 2 rounds of Skeet doubles. It mixed it up / kept me mentally more alert and ready for a 4 day tournament.
When I go to a sporting clays shoot - one day event / I rarely go thru the course a 2nd time. When I have gone thru a 2nd time / I often miss the target I hit the 1st time because I lose focus and take them for granted / and I do better on targets I missed on the 1st round. I'm a B class shooter / averaging about a 72 ......so I'm no master class guy breaking 90's ....and I do it for fun anyway / but that's some of the stuff that works best for me.
I also don't shoot sporting 12 mos a year / its wet up here in the winter anyway ..... but I need a break mentally. I do better if I focus on a 6 month season ( Apr - Oct ) or so .... get my warm ups in, in March, then hit it hard in April .....