Hey Guys, I am putting together a 300blk SBR & would like to start load development planning for subsonics. I do not have a chronograph but here is my plan:
Without Suppressor:
- Start with load a few 1/10gr above of similar postings of subsonic loads & work down
- I’m hoping I will be able to tell when the load becomes subsonic with hearing protection on an unsuppressed shot?
- Once first subsonic unsuppressed load is found, drop down a few more 1/10gr to account for the fps boost from suppressor
- Confirm rounds are stabilized & not keyholing
With Suppressor:
Test final suppressed subsonic load
Does this seem like a valid plan? Any other recommendations?
Without Suppressor:
- Start with load a few 1/10gr above of similar postings of subsonic loads & work down
- I’m hoping I will be able to tell when the load becomes subsonic with hearing protection on an unsuppressed shot?
- Once first subsonic unsuppressed load is found, drop down a few more 1/10gr to account for the fps boost from suppressor
- Confirm rounds are stabilized & not keyholing
With Suppressor:
Test final suppressed subsonic load
Does this seem like a valid plan? Any other recommendations?