09-15-2024, 04:30 AM
COAL depends on both the bullet length & its seating depth in the case neck along with being able to fit in the magazine without getting into the lands in the barrel. A good place to start for seating depth is seating the bullet the length of the bullet's caliber. For the 6 ARC that would be .243" into the case neck. For boat tail bullets, that would be .243" from the start of the boat tail & up the bullet shank.
2.26" COAL is pretty much a standard for bullets intended for AR type magazines. That length can be assured to fit any AR mag. I've found for longer/heavier 6mm bullets that 2.28" COAL will fit in all the different brands of 6 ARC/6.5 Grendel mags I have without jamming into the lands. I still have some bullet jump in my chambers.
The 55gr Nosler Varmagedden bullets I'm using for fire-forming 6 ARC brass have a COAL of 2.05". Another hand load with Hornady 103gr ELD-X bullets has a COAL of 2.27".
You might have to experiment with bullet depth to find your best accuracy.
2.26" COAL is pretty much a standard for bullets intended for AR type magazines. That length can be assured to fit any AR mag. I've found for longer/heavier 6mm bullets that 2.28" COAL will fit in all the different brands of 6 ARC/6.5 Grendel mags I have without jamming into the lands. I still have some bullet jump in my chambers.
The 55gr Nosler Varmagedden bullets I'm using for fire-forming 6 ARC brass have a COAL of 2.05". Another hand load with Hornady 103gr ELD-X bullets has a COAL of 2.27".
You might have to experiment with bullet depth to find your best accuracy.
The trick is growing up without growing old. -- Casey Stengal