Woohoo, bonus points!!!! An ejector gun.
All three of my H Lefevers and one I'd sold have nominal 2-5/8" chambers but you'll want to check yours with a good chamber length gauge. Also, a strong suggestion to get the bores and wall thicknesses measured full length and do some consultations before shooting her with anything. Bad things have been done to many shotguns over 100+ years.
