BACK IN THE 1970's, WHEN I WAS ACCUMULATING AND RELOADING FOR THE S&W MODEL 53 JET REVOLVER, YOU ALLEGEDLY COULD GET 2,000fps WITH 40gr BULLETS AND NOT HAVE SET BACK OR EXTRACTION ISSUES IN THE MODEL 53: BS! MAYBE IT WAS THE LACK OF AND/OR IGNORANCE OF GOOD CRIMPING DIES AND/OR TECHNIQUES, BUT 40gr BULLETS AT 2,000fps WAS MORE OF A MYTH THAN A REALITY. THE .224 K-CHUK "MADE ITS NAME" USING LIGHTER BULLETS, AND AS I HAVE STARTED MESSING WITH 22CF REVOLVERS AGAIN, AND USING A LEE F/C CRIMP DIE (A COUPLE OF THEM SPECIAL ORDERED FROM LEE), I HAVE DECIDED THAT IF YOU WANT A LOT OF VELOCITY YOU NEED TO USE LIGHTER BULLETS, e.g. LOOK AT THE 400fps DIFFERENCE IN THE REEDER 218 MASHBURN BEE ABOVE BETWEEN 40gr BULLETS AND 34gr BULLETS.