Re: "Fast" 30 cal. barrels?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kombayotch</div><div class="ubbcode-body"> So, lets talk about velocity... </div></div>
Every barrel has its own personality if you will. Bore and groove diameters will vary ever so slightly as will reamers and chambering techniques. Different lots of powders and primers also add to the equation as does the ambient air temps.
Velocity is a direct product of pressure and the above mentioned variables. No one can say barrels by maker "A" are faster than barrels by maker "B". I've always found that if my velocities were slower than I expected, I needed to change powder and or primers.
An example of this is my 7/300 wsm with a Krieger barrel. With 62.0 grains of H4831, WLR primers and the 180 Bergers, accuracy was great, in the low .3's but, velocity was in the mid 2,700 fps range. When I increased the powder charge, the pressure was too high. The velocity was too slow so I changed to 67.0 grains of RL-25. The velocity jumped to 2,875-2,900 with accuracy in the high .2's. I changed yet again to 69.0 grains of H1000 with the CCIBR2's. Velocity is 2,950 fps and accuracy under .250 moa.
It's more about the ammo and not the barrel when you get to a certain point. For a 30 cal. barrel I'd choose a cut rifled, four groove, .300/.308 and run with it.
