Gtscotty
Member
- Joined
- Jul 2, 2007
- Messages
- 3,635
Well...
If the use quicker powder to generate 1/3 higher chamber pressure, for a 1/3 shorter barrel...?
The muzzle pressure might be similar.
Like a HG round out of a carbine.
I think that the milspec calls for a suppressor.
One of the articles said that Sig has been working with some new powder blends optimized for this case, I'm guessing that they are denser then usual because playing with Quickload, you could reach the performance levels they were indicating with 80 ksi pressures, a 60gr case capacity and existing powders, but most loads were pretty compressed.
In general, what you said seemed to be true, at least while just doodling with Quickload. Faster than normal powders gave the highest velocities at 80 ksi because the slower powders were too dense to pack enough in. With these faster powders, the muzzle pressure was lower than you'd think, and lower in general than big magnum cases using heavy loads of slow burning powder at normal MAP.
In general though, I still think a 16" lightweight threaded hunting rifle like this is probably intended for suppressed use, in which case the muzzle pressure/blast is of little concern (as long as your can is rated for it).