I'm really considering a redfield 4-12x40 for my 6TCU but would like some feedback on how the accurange retical is working out. Is anyone using cartridges that arn't in grp #1? Like the 6TCU. Is there ballistic freeware or payware that would compute the new shorter impact points?The 6TCU &85gr btsp come the closest to 243win 100gr balistics but still falls -1.5-9.0" out to 500 yds. any suggestions?