@tgonza , if at all possible, find or borrow the use of a chronograph.
Measure the typical speeds of factory ammo that works well for you.
Then, do all your load recipe homework and pay particular attention to how your rig performs compared to load recipe data.
Often times, you may see that their reported speed is a little higher or lower than yours. If for example your reference books say your starting load should be something like 1055, but your loads only make 955, be even more careful as you work up.
Some of the published Autocomp recipes for a 125 gr show a 0.5 grain range from min to max, so put at least a few steps in between those levels as you go.
As you gain experience with multiple pistols, bullets, powders, and calibers, you learn to spot trouble earlier. If at all possible, find a mentor and use a chronograph. It isn’t impossible to work up without those if you are being careful, but you learn faster with those two things than you do on your own.
Here is the Hodgdon data for a similar weight 125 LCN

And another for a 125 gr Sierra FMJ.

You can see you are not maxed out, but those are data for a 4” bbl. You almost always find some differences based on brands and barrel lengths. Try and bump up just a little at a time to get ejection, then see how your data stacks up against the published numbers and don’t go over whatever value they gave you as a max unless you have the experience yourself or are with a mentor. Good Luck.