Sorry, the velocity claim is wrong:

Not the G5, but the similar GC-45, because I have three 'extracted from FT' values for max range firing of ERFB-BB, ERFB, M107 ammunition natures.

The 'headline figures' are:

ERFB-BB mass 48kg, V0 (zone 10) 897m/s Range 39600m, *average* range-rate zero-zero 353m/s
ERFB mass 45.5kg, V0 (zone 10) 897m/s Range 29900m, *average* range-rate zero-zero 302m/s
M107 mass 43kg, V0 (zone 8) 675m/s Range 17800m, *average* range-rate zero-zero 274m/s

The actual path travelled will approximate a parabola, so 'actual average' velocity will be a bit higher, however the minimum velocity, which is usually near or just after the apex, is considerably lower.

According to the method of this paper:
http://journals.tubitak.gov.tr/engineering/issues/muh-04-28-6/muh-28-6-3-0404-5.pdf

For the M107 projectile at max charge I get 'around' 250m/s at between 10, 11km, for projectile impact at 17800m.
For ERFB, 'around' 260m/s at 15km, for projectile impact at 29900m.

The actual value may differ by a few m/s, but I'd be *very* surprised if the minimums exceeded the 'average range rate' for a max-range shot.