How do I get an elephant snapper added to a rifle ?
IN GERMANY IT COTS 1.500 EURO (DEPENDS ON THE SPECIFIC HEAD) INKL. TAX AND FIXING.

How does it shoot and what bullets/charge is it regulated for?
IN TESTS (IN EUROPEAN GUN AND HUNTING MAGAZINES) THE HEYM DOUBLES MOSTLY WINS.
YOU CAN REGULATED THAT DAOUBLE WITH EVERYKING OF AMO AS YOU WANT.
TYPICALLY: THEN AN NEW OWNER BUYS A NEW GUN, HE GIVE HIS SPECIFICATIONS; SO EVERYTHING IS 100% CORRECT.