Strange Day Good Day

[bruce moulds]

out to 500 meters, a good bpcr bullet will have about 3x wind deflection of a 308 155 gn palma load.
from there out to 1000 yds the bpcr will be double the 308.
you can pretty near put money on it.
the reason is that out to 500 the bpcr bullet is transonic and therefore has increased drag
when it goes fully subsonic the drag reduces significantly, hence the change in relative deflection.
this happens at getting near 900 fps.
of course the 308 is at the top end of the transonic zone at 1000 yards, so his problems are about to start.
shooting a 308 at 1200 yds can be very problematic, especially with the wrong bullet.
head of the list here is the 168 sierra matchking which could even start to tumble.
we do well to get our bullets through the transonic due to a higher stability factor, usually about 1.8, compared to 1.5 with the 308.
also our bullets have undergone virtually no spin decay while transonic, while the 308 has lost at least 25% of its spin by the time it has reached its transonic flight.
keep safe,
bruce.