new member needing some help with my 6 PPC rife loads. thanks

Mach 3 even toward 4 is normal. Not sure subsonic will reach the target w/o extreme elevation. Dangerous. Best do some more research. It’s a great round when shot fast. As always, have fun and enjoy punching holes in paper.
 
Thanks for your comment, I am very aware of the use of the cartridges in bench rest. I have owned and shot several BR rifles for many years. However, I have a custom varmint rifle in 6 PPC. I would like to be able to use it with subsonic ammo. I have found information on subsonic 223 Remington loads and thought the 6 PPC would be fine to shoot subsonic for varmint hunting under certain conditions. I apologize to anyone who is offended by my request for this information.
 
bigshotpool said:
need some loading data for a 6 PPC Subsonic load for a 68 grain bullet ( powder and grain information needed) thanks for your help
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Hodgdon has reduced loads using H4895 powder, 60% of maximum listed loads.


I couldn’t find load data using H4895 in the 6ppc. I would think getting the 68g bullet under 1200 fps would be difficult and probably dangerous.

No need to apologize, Mr Smithers is just grumpy.
 
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Hodgdon-
How to load for subsonic ammunition, for RIFLE calibers:
Introduction:
Loading rifle calibers to subsonic velocity levels must be approached differently than working up loads for accuracy or range use.
Notes on loading Subsonic
Faster burning powder leads to lower loading densities, which can cause ignition issues and increase the possibility of double-charging – please take extra care in case preparation and loading.
Extremely low velocities (< 900fps) are indicative of low pressure and are an early warning sign that a stuck bullet may occur.
To maintain combustion efficiency, the velocity should be kept as close as possible to the sonic threshold (1025-1100fps) for most conditions.
Projectiles with sharp, pointed ogives do not make good subsonic projectiles because projectiles at subsonic velocities do not exploit the design features of high BC bullets.
Use projectiles with the shortest ogive possible, preferably round nose projectiles – this will ensure better stability due to a more centered COM (center of mass)
Use heavier projectiles for a particular caliber. The higher inertia ensures better ignition and combustion.
Subsonic loads using standard components will not cycle high power, semi-auto rifles unless a substantially slower powder is chosen that will have this effect, but significant unburnt residue may result.
At subsonic velocities, either the chamber pressure is extremely low in most rifle calibers, which can lead to poor combustion efficiency, or the powder is extremely slower than the one for standard SAAMI velocities, which will lead to significant unburnt residue.
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