Originally Posted by sniper762
YOU do know that it is not recomended to load jacketed projos in rifles to subsonic velocities (builds excessive pressures). use cast lead. i called sierra reloading tech for .308 susonic info. they said 7gr. of unique behind a cast lead 200 gr. projo for 1050fps.
also no subsonic loads will cycle semi auto actions. my reason for going with the 22 adapter.
You are right about them not cycling but, I knew that before I started. With trailboss there is no risk of overpressure. They even have a trailboss load on the IMR website of 4g with a 55g FMJ. They also have instructions for a reduced load with any cartridge. It is something like 20% less weight of trailboss than what fills the case to the bullet depth. This powder is a unique one that was developed for low pressure situations. This load is also a unique one with a very specific application, which I believe others may have a need for. That is why I shared my experiences with this load.
Next I will be working on some subsonic loads with this powder and some heavier bullets. But for now 55g FMJs are what have been tested.
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