It does sound as if the chamber is too deep (long?).
That would give the pressure indications.
If the mouth of the case is jamming on the bullet it will raise
pressure (a lot). Cutting a scosh will check this. Oiling the case will allow the case to come back at low pressure then expand forward without the stretch ring.
All this is a check of the chamber; too much headspace, short
throat.
How yoy thing that oiling the case will cause "gas in the face"
escapes me. It sounds like a bad chamber, this would prove it. Take Care!
