Anyway, since a thread like this is created every month or two, let me explain the conclusions from the previous studies of hit ratio (one of which is, again, linked above):
1. The correct formula for average damage per shot (including misses and crits) is:
(0.8+HA/100) * max_dmg * ((1+min_dmg/max_dmg)/2+CHA/500)
The first expression in parenthesis is the effective hit ratio, which ranges from 0.8 to 0.9 with HA;
the second expression in parenthesis consists of two terms, both of which are multiplied by the max_dmg. The first is (1+min_dmg/max_dmg)/2, which is the average damage per hit; the second is CHA/500, which is the crit hit ratio (==0.02 at unenhanced, maxed CHA of 10). As mentioned above, the key difference between this and the existing formulas (e.g. entropedia) is that the crit hit ratio should be scaled by the hit ratio.
What this means is that your ratio of crit hits to shots increases with your HA even without changing CHA because misses can't become crits, so if you hit more of your shots, you will crit more. Of course, crit hit ratio to hits increases with CHA.
Perhaps the irony of the repeated threads on misses and miss rate is that the misses of an unmaxed weapon are far less important than the low damage hits of an unmaxed weapon. Here's why: on old school weapons (non SIB), min_dmg starts at 0.25*max_dmg and is maxed at 0.50*max_dmg. When damage is 50% maxed, the average damage fraction per shot (including misses) is 0.637 (with maxed Hit). Compare this with the average damage fraction per shot (including misses) with damage maxed and Hit 50% maxed, 0.651, and you will see that with non SIB weapons, the damage profession is more important to increase the dpp and dps. The difference is made even larger by the recent change to start HA at 4 instead of 0 (the numbers above were calculated using the old 50% maxed HA of 5). Also consider the predominance of Hit-related skills as mission rewards.* What it all sums up to is that Hit profession progress is of relatively minor concern for those trying to max a non-SIB weapon.
2. "You missed" is a marker for 0-10% misses of an unmaxed weapon (anything "rolled" for hit between 80 and 90 that is above your hit ratio). You shouldn't be seeing this message if you have truly maxed the Hit for the weapon (although the HA is rounded so it will read 10 before it is maxed). If you are, you should probably contact support.
"Target evaded", or however it's worded, is a marker for the 10% misses of a maxed weapon. Anything "rolled" between 90 and 100 will give you this result. ETA: even though the message is new, these shots have always been missed. The only change is in putting a different message in chat for unmaxed weapon misses vs. unavoidable misses.
3. Accuracy enhancers increase the ratio of hits that are crits, but not the ratio of shots that are hits. This is not a new revelation, but it's worth pointing out.
4. Skill modification attachments (scopes and sights) do affect your hit ratio for unmaxed weapons, but no one has been able to determine the exact quantitative relationship. With skill mod = 28, i get about 0.002-0.003 higher hit ratio. In other words, it gives an apparent increase of ~3 hit profession levels. The statistics are variable enough when looking at a 0.002 difference in hit ratio that it's really hard to say if this is a worthwhile change. I estimated that in my case (with the most efficient skill mod/pec decay attachments), it comes out about even. It would be really nice if MA could give us a more specific guideline on this, especially since they are including a scope in the starter pack. There has never been a test that has showed higher hit rate for maxed Hit with attachments.
* Unfortunately, a lot of Dmg profession skills are unlocked, and unlocked skills are currently not available as mission rewards.
