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Gotcha. I'm new to the subsonic stuff. So what they're saying is the "max" load is the lowest you should go to ensure no stuck projectiles?
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I think they have the "Starting" and "Max" labels reversed
Good luck! I've just started working with my 300blk. I'm using Maker Bullet's 200gr REX 2.
I've been really impressed with the groups so far. I'm getting 0.88"-1.02" 5 shot groups@ 75yds out of a 16" Remington 700 SPS Tactical 300blk. I'm anxious to see how it performs on Does!
It is confusing because it is a subsonic load. Start high and work your way down to your subsonic velocity..
Gotcha. I'm new to the subsonic stuff. So what they're saying is the "max" load is the lowest you should go to ensure no stuck projectiles?
The data they post is a good upper end velocity that gets you close to the subsonic velocity that you want so you avoid the sonic crack.
It helps to have a chronograph to work subsonic loads. Excessive pressures are not so much a concern in this case.
The starting load they give will insure that you do not exceed pressures with a heavy bullet with the idea being that you work down to get the velocity you want that is subsonic.
For the Lehigh I look for something around a 1,050 fps.
Temperature will help you calculate what the speed of sound is for your situation.
Or, to be sure you stay subsonic, you can develop a load that will stay subsonic in low temperatures.
Speed of sound calculator