The loading manuals are an important base of knowledge,But only a safe port from which begin the real sailing.(what a poet philosophre I am).
The powder dose is one of the many ,and often more important factors in making safe reloads.
We Italians enjoy illuminated ,antifascist ,liberal gun control laws ,and we cannot have 9 mmx19 ,aka 9 luger pistols.( WEAPONS OF WAR)
We must have the 9x21 imi cartridge ,which is an opened up 30 luger cartridge.(weapon of peace)Just to prevent cheap 9 luger imports from abroad.
You can only use the the bigger capacity given from 2 mm more lenght of brass if you have a 1911 colt magazine.which accepts 38 super ammo.
In the other 9mm pistols we have to stick to standard 9x19 cartridge oal.as dictated by the magazines.
In my Hi power browning pistol I keep all the grease grooves of mi 124 TL bullets inside the neck,seat and crimp with the normal lee seating die.
I do not need the separate factory crimp (and cartridge sizing) die. My chamber throat does not accept 357 bullets without sizing them.Though the chamber accepts 358 and 359 bullets.
If your throat compels you to seat deeply the TC bullets in the 19 mmcase,you risk higher pressions.,So you should start again load development beginning with a lower
powder charge.Using the lower load that cycles the gun reliably ,you should have no problems.pressure wise.
To enjoy the simplicity of large numbers of bullets made from a Lee 6 cav mold and the ease of XLOX and LLA lubing I think you could rethroat your barrel to accept 124 TL bullets loaded to the longest OAL accepted by your magazines and the loading ramp of your pistol.
Many of my Italian pratical shooters friends shoot tenths of thosands of commercial cast bullets in 6mm,40S&W and 45ACP through the poligonal glock barrels.Without a problem.
I have treated my 45USC Heckler&Koch carbine,having a too much slick barrel wth a valve grinding compound fire lapping ,have taken away the dangerous shine from the bore and shoot merrily my 230TL bullets ,round nose and flat point.