As several others have suggested above, just start low.

Yes, a deeper seating depth may increase pressure, but that's more of an issue when the bullet sets back when chambered and results in greater pressure in an already near maximum load.

Just start low and work the load up carefully at whatever OOL you need to get the round to chamber and for reliable feeding.

Pressure tends to be lower with lead bullets than with jacketed bullets in general, so you'll likely find it'll work just fine while being well under the maximum average pressure.