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I talked to a USASOC buddy today who has tested some of the AB rounds - he said they shoot very well at 1000m.
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If you go and read what Gene and Richard are saying about the old M118 Special Ball in the M14 thread it is very interesting being as the M21 is still widely used (I pulled that thread up with a stupid but true story as the best one I could find on this forum about the M21 and Special Ball). The 173 grain Full metal Jacket Boat Tail bullet itself was made by Lake City or Frankfurt arsenal. The stuff was really great at extreme ranges well past the transition zone. Even if you could get the M118LR stuff to be stable at the same distances the hollowpoint is not going to expand so expansion is not a consideration. Very few people do well with a 1/3 inch diameter hole through them so the FMJ BT was just as good as any other style bullet at those ranges.
It would be interesting to compare the shape of the Berger bullet with the 173 SB but I am sure Bryan L changed the nose profile in order to get a G1 of 0.5 but I bet the boat tail is the same