4.7 with a 185 is a pretty light load. You are probably not expanding
the case enough to get a tight seal in the chamber. I wouldn't worry
about it very much, with Titegroup all you will get is a little soot which
should cause no damage.
FWIW, 4.1-4.2 with a 230 gr, or around 5.0 with a 200 gr are what I load
to (just) make major power factor for Practical Pistol competition. Still
a lot lighter than factory ammo.