The thing is, you can still load and shoot 140gr no problem, but it won't be at velocities anywhere near 2600fps with a standard AR15 set-up. It is possible in a bolt gun, and maybe an AR with a larger bolt that can take higher pressures and the resulting bolt thrust.
The thing is that a lot of slow-burning powders have really large kernels, and that doesn't jive well with a case limited to 35gr of water/31gr of powder.
The thing is that a lot of slow-burning powders have really large kernels, and that doesn't jive well with a case limited to 35gr of water/31gr of powder.
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