In2anity wrote:Let's be honest, the 300aac/"blackout" is not really a sub-moa cartridge. There is always an optimal range to rotate a bullet and using an rpm outside of this range, too slow or too fast, will cost you some accuracy. In the same way you can pull a bullet apart with centrifugal forces, sometimes at 400,000 rpm and others at 1000,000 rpm. If you rotated the tyre in the vacuum of space, not attached to an axle, at the speed of sound it would still come apart. This sudden translation is what initially sets up the pitch and yaw in the bullet which then damps in flight if the bullet is (sufficiently) stable.Ĭentrifugal forces increase to the point where your tyre will fall apart when you rotate it more quickly, this may occur at 60 mph or at 600 mph. In the case of a bullet it is constrained by the barrel to rotate around it’s center of form but on release from the barrel it immediately rotates around it’s center of mass. This example is a complete misconception, as the unbalance forces are constrained by and transmitted to the axle. If your bullet jacket has a little runout, you will find an RPM where it begins to become unstable. wanneroo Warrant Officer C1Ī good example of the wobble you are describing is an out of balance wheel on your car which is fine at speeds under 60 MPH but when you go over this speed you feel the vibration through the steering wheel. And that includes some 300 Blackout stuff. I have an extensive back catalog of videos of me shooting machine guns, so eventually will get them on Youtube over time. Eventually I am moving towards acquiring suppressors for all my modern rifles, just to reduce the impact on my ears. Of course the supers still have the super crack but it still reduces the sound. I've shot 300 Blackout suppressed with supers and subs and like with any suppressor, you are looking at a 30 db reduction in sound typically. In my experience, and when the opportunities presented to use this gear overseas, the most benefit comes from using a suppressor with subsonic ammo. Sure it does marginally, but it works more as a muzzle brake that can be used without muffs. The whole point is to make it “quiet” or suppress the sound. A suppressor doesn’t really make a huge difference IMO when using “regular” ammo. Ferrisweil Lance Corporalįerrisweil wrote:Sorry Blade, but gonna disagree with you completely here. It can work well on 308’s etc but even with a subsonic ammo, it will still spook nearby game. Makes an awesome difference with sound, especially in your small calibres when hunting. If you really want a suppressor to shine AS A SUPPRESSOR, use it with subsonic ammo. Sorry Blade, but gonna disagree with you completely here. If you're going to use a suppressor you don't need subsonic ammo, without a suppressor is where subsonic ammo really shines. Whenever I read about loading for subsonic I think hmmmmĪll that said, congratulations on getting yours dialled in I just couldn't understand why you would when it's so difficult to legally obtain a suppressor here. ![]() Like I said, you need to do the work.On_one_wheel wrote:I was really surprised when people started using 300 blackout in Australia. So, based on your bullet and seating depth, there is no concrete starting charge. 3) Start with this beginning load and work up to your maximum charge, all the while searching for the most accurate reduced load. Pressures will be below the maximum allowed for this cartridge and perfectly safe to use! 2) Take 70% of this powder charge weight (multiply the maximum load from step 1 by. ![]() Then fill the case to that mark with Trail Boss, pour into the scale pan and weigh. This formula may be used in both rifle and pistol applications: 1) Find where the base of the bullet to be loaded is located in the case and make a mark on the outside of the case at this location. If you don't see Trail Boss data for your favorite cartridge we have a formula for developing loads for all cartridges and it's simple to follow. "Listed below we show a few examples of rifle loads throughout the Reloading Data Center, but the fun doesn't stop there.
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