For the load you're talking about 1 or 7/8 oz, I would and have used LM and IM (.015/.025) combination with much success. My best SC score was with this combo. I have also used a 20g with M/F combination to great success. Contrary to popular lore, I find the lighter loads do reduce my SC scores. If those are the two choices for your payload, I'd go with the 1 oz with LM/M or LM/IM. But chokes are often shooter and course dependant. I'm not what I'd call a quick shooter. But I have a friend that has reaction times that are phenomenal and he can shoot more open chokes on many outgoing shots where I'm shooting much tighter chokes to ensure an adequate pattern density.
