Thread: Bullet Seating depth and pressure (6.5 Grendel)

Gidday Pete - I ran these loads in Quickload to see what it said . . . which is only an indication but sometimes helps to understand what is happening.

Q/L doesn't have ADI 8208 but it shows IMR 8208 XBR - and since all these are marketed by Hodgdon one might "assume" they are the same - but no guarantee.

At 27.7gn of IMR 8208 XBR you should be getting about 2530 fps from a 22" barrel (I'll recalculate it if you let me know the actual barrel length), and pressure at 2.25 COAL is indicated at 53,800 psi. At a COAL of 2.26 the pressure indicated is 53,300, so bugger all difference. The Leade design and free bore will also be a factor. Just to fully disclose, the SAMMI max pressure for the 6.5 gendel is 52,000 psi so your loads are already "up there" - at 28.5gns the pressure is indicated at over 58,000 psi