Thread: Bullet Seating depth and pressure (6.5 Grendel)

Originally Posted by PommyMcPomFace

It was. My Grendel has now been mostly relegated to <100gr bullets at higher velocity for varminting, as I have another rifle or two to use for long range.

I don't think quickload is as good at predicting pressures and velocities in the Grendel as it is with more common cartridges like 223 and 308. But it still gives a good indication:

If you know your bullet is up against the lands, quickload instructs you to add 7200psi to the "start pressure" and when you re-run the calculation after factoring that in, the 53k psi load that @Tentman demonstrated turns into a 63k psi load. Going the other way, away from the lands, it reckons you'd have to seat the bullet all the way down to 2.100" OAL to get the same rise in pressure.

Ok, thats good to know and answers my question, theoretically a huge jump in pressure if loaded out to the lands. I don't exactly know for sure where the lands are on this rifle yet, I just loaded a dummy round at pretty much maximum magazine length (2.260") and made sure we it was feeding ok and not getting stuck in the rifling. But I suspect we may be close. Clearly you have to seat a bullet very deep (2.100") at the other extreme to get a pressure spike.