The enertia devoloped by a certain load is a dependent on several factors, the bullet weight is only one of them? It is like balancing bowls of soup, occasionally, you're going to spill some...
case in point, cracked rear toggle, or, broken rear toggle pin...
Me personally, I just shoot'em, I don't know what makes'em work! (like Oddball, Kellys heros!) Best, til.....lat'r....GT....
