.300 Whisper OAL for semi-autos?

[Rikky Lee]

Good post lou. The vertical string issue is an important one to mention to new shooters as playing in the subsonic arena is vastly different to subsonic loads that we have become used to.

I'd be doing up a number of dummy rounds at full mag length and slightly shorter and cycling them through the rifle to get an idea of how that particular rifle functions. Remember that it is easier to tune a load to a rifle then tune the rifle to the load.