Re: 155grn lapua scenar fps top speed?
It depends on the conditions. My ballistic program thinks a Scenar 155 will be well supersonic at 1000 if fired at 2750 <span style="font-style: italic">on a standard day</span>, i.e., BP 29.53, Temp 59, Humidity 78%.
But in colder weather or with higher BP, it will just depend.
At 35 degrees with a BP of 30.2, it will be marginal at 1000.
As far as transonic goes, I'd like to have a 10 percent margin of error, i.e., 1.1 times the speed of sound at the target under the conditions which exist.
And it depends a lot on the bullet. Some bullets will transit the speed of sound pretty well behaved. Others won't - I've seen 168 SMKs going sideways at 1000 yards.