03-23-2025, 05:12 PM
Both lever and CFE are not good examples to compare against, as their pressure curves and makeup are far different than standard powders. They are more rounded so while pressure does not get as high on peak, the area "under" the pressure/distance graph is what delivers the energy and acceleration. Powder "burn rate", therefore, is not the be-all for these guns. If a powder is too slow (ie, like one for a magnum) you might not get enough powder in the case, or the push to get the bullet out and the bcg to cycle back... These cartridges for the AR15 are somewhat limited on overall case capacity. One way to attempt to discover before you load is to get quickload or GRT... I've got GRT and use it as a decent guide - not perfect, it takes some tweaking, but better than loading blind with a new powder.
The other difficulty in both the grendel and the 6 Arc is their brass base is larger so max allowable pressure is limited to 52 ksi in a gas gun, which is below the point where case swipes, sticky lifts and flattened primers tend to occur.
So it is a good observation to be wary of "max" pressures in these cases.
The other difficulty in both the grendel and the 6 Arc is their brass base is larger so max allowable pressure is limited to 52 ksi in a gas gun, which is below the point where case swipes, sticky lifts and flattened primers tend to occur.
So it is a good observation to be wary of "max" pressures in these cases.