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I ordered some 10 days ago and just got them on Tuesday. I imagine the holidays have slowed things down. Sometimes I don't get emails from them on shipping. They just show up.
It's a copper relief band, namely a place for the etched copper to go as the bullet engages the rifling. The back portion's copper is relieved at the boat tail shank junction. As long as the continuous shank length is around 0.320" not enough copper balls up to foul the barrel excessively. Two bands measurably reduce BC. Multiple ones all add more drag to the bullet. It is well known that over long distances higher BC bullets will eventually pass lower BC bullets shot at higher MVs. When that happens depends on the BC difference between the two bullets.
Thanks for the response and the info on one band vs multiples. I know the early monos had fouling and pressure problems until they went to the bands to allow copper to deform into them.
It's not that our bullets cannot be shot at high velocity. They certainly can. Witness the 80 gr BD2 .243 bullet be pushed to 3650 fps from a 22" factory barrel and still be able to group sub-MOA at 600 yds with the right powder/ brass combination. It's just that when you add BC to the combination long range performance is increased.
Yeah I could have worded that better about pressure and velocity. Thanks.
Your wording was just fine. I knew exactly what you meant.
338 RBH (338 Norma mag improved) and the 250 SBD-2
Nice! Look forward to seeing how it works for you. I'm in the process of trying the 225 gr BD2's now in my 338 Norma (standard). Trying the 250 SBD2's next.
