I have to apologize for my post #18. In post #14, you wrote "Universal" for the powder. I somehow registered that as "Unique," which is why in post #18 I was blathering about Unique.
Universal is made (or sold) by Hodgdon, so my first resource would always be the Hodgdon web site, which we can probably assume will be reasonably up to date. They list a load for a 124-grain Berry's bullet -- but it's a hollow-base round-nose bullet. They show it loaded to a C.O.A.L. of 1.150" but that's not helpful because of the hollow base.
1.150" is the C.O.A.L. suggested by Berry's for that bullet. the bullet itself has a length of 0.612". The 9mm case has a nominal length of .754". This tells us that the seating depth for that combination is 0.216".
Awhile back, in another thread, I proposed approaching situations like yours using a greatly simplified analysis from high school physics -- applying the formula for behavior of gasses: P1V1/T1 = P2V2/T2. We want to solve for the unknown pressure, P2.
The [nominal] usable case volume for a 9mm is 0.862 cubic cm (according to Wikipedia). That converts to 0.0526 cubic inches.
If we use a cross-sectional diameter of.356" (which has to be an approximation, because the case tapers), we get a cross-sectional area of .0995 square inches. Multiply that by your .211" seating depth and the volume occupied by the bullet is .0210 cubic inches. Subtract that from the nominal case volume and that leaves a usable volume of .0316 cubic inches.
Now run the same calculation with a seating depth of .25". The volume occupied by the bullet then becomes .0249. That leaves .0277 cubic inches of usable case volume. That's a decrease of 12.34 percent. So a very crude approximation is that the pressure will increase by roughly 12 percent.
For the one load that Hodgdon has data for using Universal and a 124-grain bullet, their starting pressure is 26,300 psi. Increasing that by 12.34 percent yields 29,545 psi. Hodgdon's maximum load for that recipe is 33,500 psi, so it doesn't appear that the increased seating depth would put you over the maximum pressure. Nonetheless, reducing the starting load from 3.8 grains to 3.5 grains would certainly be prudent.
CAUTION: As Unclenick pointed out in the thread where I proposed this analysis, it is at best a crude approximation. I'm comfortable using it for myself because I never (with one exception) go much higher than mid-range loads. A much better approach would be to use QuickLoad or Gordon's Reloading Tool. I have submitted the dimensional data for all of Lee's .45 ACP and 9mm bullets (except the hollow-base bullets, because I don't have dimensions for the 9mm hollows) to Gordon's Reloading Tool but, as of a week ago, they haven't issued an update with that data included. Hopefully it will be in the next update.