Re: 6-284 ?
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how fast will a 6-284 push a 55gr. bt. What length barrel is best. 26,28,30. I'm sure 30 would get the most speed but is it worth it? is this to overbore for the really light 6mm bullets?
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Probably in the neighborhood of 4300 to 4500 fps.
The problem is this - if you get a slow twist like 14", the rifle would NOT be good for much of anything, cuz the 55gr bullets won't hold the velocity for long range... and the 6mm-284 IS a long range cartridge.
If you want to demolish woodchucks into a red mist at short range (to 400-500 yds) then get a standard .243 or 6mm, with a slow twist barrel. Velocity with the 55gr bullets will be in the 3900fps range It'll be a lot cheaper and the barrel will last longer.
If you are building a long range rifle, then you will want to use the heavier 105gr + bullets, and they won't stabilize in a 14" twist (or a 10" either). If you get a 9' twist that will stabilize the 105s and higher weight bullets, the 55gr bullets will turn into a puff of smoke before they get 50 yards.
So you have to chose - there is no rifle that will do it all.
Do you want a lightning stick that is good to 400-500yds... then get a .243 or 6mm Rem with a slow 12" twist.
Do you want a really long range 6mm then get a fast 8" or 9" twist 6mm-284.
Here, kitty kitty kitty.
LRH member #23