One thing I’ve noticed about some skills that improve magazine size, specifically Zane’s Praemunitus is that they seem to underperform, especially on the kind of guns that you would like to boost the most. Praemunitus grants a boost of 8.3% per rank up to a max value of 25%. This means, having a single point in Praemunitus won’t benefit you at all with any gun that has a mag size smaller than 13. That’s pretty much all Jakobs and Torgue pistols in the game, the majority of snipers, the majority of launchers, a considerable amount of shotguns. Praemunitus is only really worth it if you spend the full three points, ideally you wanna boost it by a COM, too. But the thing is, that’s just not worth three skillpoints. If it were a single tier skill that increased your mag size by 25%, maybe that would suffice. But even that might not be enough.
I don’t think there’s many people out there using this skill, not only because you can get a much higher mag size bonus from just an artifact which still leaves space for two other bonus rolls as well as a primary and secondary effect - Praemunitus also competes with Synchronicity and Borrowed Time, one being among Zane’s most important damage buffs and the other one is at least a somewhat popular choice for people who want to get more out of their good misfortune.
What I would suggest is the following:
1: Make every point of Praemunitus increase your magazine size by one, if the mag isn’t big enough for the percentage value to have an impact. I don’t think three extra shots in the mag will be gamebreaking, but at least they’ll make a bit of a difference if I’m using something like a Duc or a Maggie.
2: Increase the percentage value. I’d say at least 10% per point, maybe even 13.3% at which point the full bonus would be about the same as you can get from a level 50 artifact.
I still don’t think that would make Praemunitus a top tier skill for Zane, but it would be one worth spending points on.