475- good idea re: Remintgon. Most lever guns must hav ethe lever held against the wrist to disengage the grip safety.
: I had a .444 that used to drop the lever with 300gr. at around 2,100fps. The pressure wasn't too high, but recoil energy was significantly higher than factory-type ammo. The lever-drop was unsettling. I sent it back and it was repaired and returned - it stopped doing this.