Theoretically would the 1:48" twist work better with the shorter lighter conicals such as Hornady's 240 grn PA conical, Lee's 250 grn REAL, and 240-255 grn pistol bullets? It seems that if a 1:60-70 is ideal for RB and the very fast twists are intended for big heavy conicals the 48" ought to be about right for short bullets.

If pushing pistol bullets to 1600-1800 fps would 45 Colt bullets hold up or should those intended for 454 Casull or 460 S&W be used?

How would these projectiles work in a .502 x .520" rifled barrel?