05-22-2023, 07:34 PM
Not really. Every now and then people note that X 120 grain bullet typically runs faster than Y. The bullet itself needs to be deformed and extruded to conform to the lands and grooves of the barrel. A .264 diameter bullet has a larger cross sectional area than a barrel with a .264" dia groove dia and about 35% .256"dia lands. The Grendel SAAMI print calls for a barrel cross section of 0.0536 sqin, and a .264 bullet is 0.0547 sqin across.
I had begun to wonder if bonded bullets, for example, tend to be a little faster than others, possibly since the core needs to be almost pure lead and soft to get bonding. It should take less energy to deform the bullet to conform to the grooves and lands.
I had begun to wonder if bonded bullets, for example, tend to be a little faster than others, possibly since the core needs to be almost pure lead and soft to get bonding. It should take less energy to deform the bullet to conform to the grooves and lands.