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for most shooting it is impractical
mostly used in competition at long range (600 yards or more )
these longer rounds are usualy too long to fit into the magazine and
must be loaded one at a time through the ejection port
yes it helps ( but you will only see the difference at ranges more than
300 yards )
I use the Sierra 30 cal. 175 MK in my US military rifles, they like to be
10 to 15 thou. off the lands
My 223 Bushmaster likes the 80 gr Sierras at 25 to 30 thou. off lands
the distance off lands will vary as to the bullet - barrel combination
the only bullet I have tried that likes a jump of 1 to 5 thou. off is Berger
and I found that Sierra did just as good and were less expensive
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