Originally Posted by shotgunred
For a glock an OAL between 1.125 to 1.135 is ideal.
But new reloaders should use what the book for their load says. Only after you have mastered the book load should you consider altering the formula to find the sweet spot for your individual gun.
An ideal range of OAL for a Glock or any other pistol is fully dependent on the bullet shape. One length that is idea for a roundnose may not feed properly for a truncated cone or some other shape. As for the balance of your post, you are absolutely correct. Far too many reloaders closely follow the bullet weight/powder charge in the manual, then ignore the OAL, which is equally important in maintaining safe pressures.