I shoot a Lefever that is an HE grade with twist barrels. I routinely shoot RST 2 1 /2 inch shells that are mild enough for the old girl. I also shoot the same RST shells in my 1894 Remington with damascus barrels. Good luck with your Lefever that are splendid guns....with soul!
Regards,
Tom


Luck is the residue of good intention and hard work.