Mayes had 200 registered NSSA 100 straights in .410. He used 12 thou, which is just over mod per Briley.
What Hal said - pattern before deciding. Love setting .410 courses, but it is indeed difficult to get sufficient registered entrants at a small venue. So we designate some mid-week 5-stand sets as .410-friendly.
Like 10 to 14 thou for SC, and that'll crush 35 yd dome-off stds and battues. On a course maybe carry a handful of #7.5 for the occasional rabbit pushing .410 distance.
Some .410 setters appear not to have ever patterned a .410, resulting in presentation/distances that allow luck to enter the equation. #8.5s are popular, but I've never been able to convince myself they work better than #9s.
