Ian
Notorious member
Vastly different pressure curves, Bill. Most people think BE burns like TG actually burns, but in reality, BE burns more like Longshot at shotgun pressures.
Three things to consider: Peak pressure value, where that peak occurs, and the slope trailing from peak to muzzle exit. Consider the following three predictions, all having approximately the same muzzle velocity:
9356PSI max, at .400" of bullet travel, 1692PSI muzzle.
Here we see BE peaking pressure at 7842PSI and .430" of bullet travel, and muzzle pressure up at 2101PSI, indicating a much longer burn. Also note BE did not completely burn in this scenario, whereas TG was 100% burned up at 3", or halfway through the barrel.
Longshot has virtually the same internal ballistics as BE in this scenario, only peak pressure is slightly lower and muzzle pressure slightly higher, and less was burned. Pmax occurred at .440".
When you think about keeping peak pressure low to minimize base bumping and wanting pressure behind the lapping slug to stay UP toward the muzzle to help keep the seal, you can see why the pressure curves suggest you stick with BE, or Longshot, and use Titegroup for all of your suppressed .45 ACP loads.
Three things to consider: Peak pressure value, where that peak occurs, and the slope trailing from peak to muzzle exit. Consider the following three predictions, all having approximately the same muzzle velocity:
9356PSI max, at .400" of bullet travel, 1692PSI muzzle.
Here we see BE peaking pressure at 7842PSI and .430" of bullet travel, and muzzle pressure up at 2101PSI, indicating a much longer burn. Also note BE did not completely burn in this scenario, whereas TG was 100% burned up at 3", or halfway through the barrel.
Longshot has virtually the same internal ballistics as BE in this scenario, only peak pressure is slightly lower and muzzle pressure slightly higher, and less was burned. Pmax occurred at .440".
When you think about keeping peak pressure low to minimize base bumping and wanting pressure behind the lapping slug to stay UP toward the muzzle to help keep the seal, you can see why the pressure curves suggest you stick with BE, or Longshot, and use Titegroup for all of your suppressed .45 ACP loads.