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.Quickload calculates 20" barrel at 2701fps is 60.000psi @ 30°C with H4350 (earlier version of AR2209 is definitely slower) and that is without knowing the case capacity...could very well exceed the...

This is a bit like asking how long is a piece of string.

You need to provide the weight and type of powder, projectile, and primer before any meaningful info can be given. 284's are notorious for...