02-23-2012, 04:34 PM
hydrotech Wrote:why would the .243 LBC shoot an 85 grain bullet slower than a .264 85 grain bullet? I woulda thought with a similiar case capacity the smaller diameter bullet would be faster?
This is the same idea that is behind the .338 Federal. The .338 Federal is a .308 Winchester necked up to .338 and it is able to push the same weight of bullet faster than the .308 Win. Armalite chambers this round in their AR-10. The larger diameter bullet for a given weight slows down faster and does not have as good of BC but is able to deliver more energy at close ranges than the .308 Win.
http://en.wikipedia.org/wiki/.338_Federal