I have been deliberating with the Classic Maj/Min, and no matter how I know I drop points on Min, the Mag changes during a stationery stage or tight strings could cost a couple seconds on a med/long course of fire. That is a general calc. that I have observed, and is by no means a scientific number

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But saying that, just suppose you are hitting 70% A's, and 30% C's or so...D's are problematic anyway, but the theory remains the same.
IF there are 14 targets, say 10x2 are A hits, and 4x2 are C hits.
IF Minor, equals 116 pts, and if Major, equals 124 pts.
Now say that course of fire was done in 18 seconds with 10round mags, but due to the structure, was 19 seconds with the extra reloads.
Hit factor would be 6.44 with minor, and 6.53 with major.
BUT, if your reloads work out to be 2 seconds longer, then the major hit factor would be 6.20.
Obviously hitting a higher percentage of C's in the above figure would really mean you should be running major. IF I get to the point (and I am going into full blown practice mode in September for next year) where I am 85%+ A's, then Minor is the obvious choice......
So it all comes down to stage design and reload speeds (and we all know those little single stack mags can be a bugger to slap home quickly). I don't mind swapping ammo loads, so I bring major and minor ammo, and a set of springs, and walk through/watch the courses of fire before signing in with a power declaration. I likely won't do that next year, but as I'm fairly new, it helps me dissect the stages.......
Apologize for the rambling.............