When you hold a Berger 140gr VLD up next to the Lapua 139gr Scenar, or a 140gr Nosler CC, it is in my opinion very easy to imagine the Berger having a higher BC - i looks quite a bit more slippery - and it is.
The bullets i shoot regularly at long range
- Hornady Amax .224" 80gr
- Lapua Scenar .264" 123 and 139 gr
- Berger VLD .264" 130gr
- Lapua Scenar .308" 155gr
- Berger VLD .308", 155gr
- Berger VLD .284" 180gr
- Berger OTM .338" 300gr
- Lapua Scenar .338" 300gr
- Barnes TTSXLRBT (at least..) .338" 265gr
All have very close to their advertised BCs. Given correct velocity (hard to obtain wo. LR-shooting given consumer grade chronographs) within 1-2 clicks at all ranges supersonic are the norm. Usually within 0.1mrad unless dodgy conditions - further than 1km, up- and downdraft will render shooters own data innaccurate very often.
All of these bullets exhibit better than advertised BCs when shot far into subsonic range, both the 7mm and the 338 Berger will hit high at extreme flight times.
This was shot at 600m using Lapua 123gr factory ammo, sighted in at 100m and using velocity posted on box, corrected for barrel length. The first shot past 100m is on this piece of paper.
Earlier Lapua BCs vere grossly inflated, and at least the Sierra BCs have been prone to odd things happening - but today, i guess not.
The worst example of an inflated BC i have seen, was the GS Custom 267gr 338 bullet. I remember not the advertised BC, but it was better than everything seen elsewhere by far. In reality, it was less than that of a 250gr Scenar.
When one starts fudging with these things, i would recommend using at Bryan Litz's BC, together with the advertised ones - and when in need to correct velocity or BC to match real data - correct the velocity, not the BC.
The BCs are measured to a far greater degree of accuracy than the average shooter/chronograph setup will measure velocity.