In message 42 is explained that if d is the proper distance and red shift z is only due to cosmological
redshift then v is the speed now (the present speed). For more detail see: neophyte question about hubble's law #42
What in theory is meant, that if redshift z is only due to the expansion of space than you can use the equation v = c * z in order to calculate the present velocity.
In the Case of NGC 6323 with a redshift z of 0.026 when you multiply this with 300000 km/sec you get a speed of 7772 km/sec which is the present speed of NGC 6323.
I have great problems with this interpretation.
The law v = c * z
The classical interpretation of this law is that there exists a linear relation between the speed of the light source and the measured redshift. There is nothing wrong with this assuming that distance between source and observer has completely no influence on the measured redshift. In fact this method is used to measure the galaxy rotation curves. One half of such a curve shows a red shift which means that the stars rotate away from the observer and the other half show a blue shift which means that the stars rotate towards the observer.
A different interpretation is that the redshift is solely from cosmological origin and from expansion of space.
The following sketch shows this:
<z>
1 2 .G
t5 1 2 .>v5
 1 2 .
t4 1 2 .>v4
 1 2 .
t3 1 2 .>v3
 1 2 .
t2 1 2 .>v2
 1 2 .
t1 12 .> v1
0G
distance d1
Figure 1
Figure 1 shows:
 A galaxy G at t1, a distance d1 away from the Observer moving away from the origin. The distance d1 is the parallax distance or luminosity distance in case they can be measured.
 The same galaxy G at present position t5, but now at a different distance d5 and with a different speed v5.
 The path of the Galaxy between t1 and t5. This is the dotted line.
 Light emitted from the star at t1.
In fact the sketch shows two light paths (frequencies) identified as 1,and 2 assuming that the star emits only one frequency (Is a "laser")
 Light (line 1) emitted at t1 from a certain frequency f1. Light has a speed c and moves in a straight line towards the Observer and reaches the Observer at t5.
 Light (line 2) emitted at t1 but with a variable frequency from f1 to f2. Line 2 shows a frequency shift caused by the expansion of space between t1 and t5.

The sketch shows that there exist a linear relation between z and v, with z being the difference between line 1 and line 2.

The sketch shows that there exist a linear relation between proper distance d and v, with distance being the difference between line 1 and the dotted line (between the path of the light ray and the path of the Galaxy).
What the sketch shows is that the Hubble constant is a constant in time. The question is, is this accordingly to the physical reality i.e. observations.
The following sketch shows a different reality:
<z>
1 2 .G
t5 1 2 .>v5
 1 2 .
t4 1 2 .>v4
 1 2 .
t3 1 2 .>v3
 1 2 .
t2 1 2 .>v2
 1 2 .
t1 12 .> v1
0G
distance d1
Figure 2

The only difference between Figure 1 and 2 is that the proper distance shows acceleration. This is caused by the increasing value of v.
Suppose at t1 the proper distance between G and Observer is d1 and the speed of G is v1. At t5 we have d5 and v5.
For H1 at t1 we get v1/d1 and for H5 at t5 we get v5/d5. With v5 being 5 times as large then v1 and d5 more than 5 times as large this means that H5 is smaller than H1 or that the Hubble constant was larger in the past.
The question again is: is this accordingly to observations.
 One problem is you can not measure the speed v directly.
 A second even larger problem, what this sketch suggests, is that presently at this very moment, the furthest galaxies have the largest expansion speeds. This does not match the concept that presently the Universe is homogeneous.
The First Hubble's law: z = (H/C) * d
The first Hubble's Law establishes a relation between z and distance d.
In fact you can consider two versions of this law:
 The first version in which the distance d is a distance in the past. This distance can be measured by trigonometric means i.e. as parallax, or as a luminosity distance. Both distances if they represent the same instant of the observer should be identical (within an error range)
 The second version in which the distance d represent the past. This is the proper distance. This distance can only be calculated if the parallax distance can be established over a period of time, which allows you to calculate the speed of the object involved. In reality this can only be done for stars in the Milky way and Cepheid variables in certain Galaxies. This does not mean that you know the speed of the Galaxies as a whole.
If you study both figure 1 and 2 than you can see that the H constant or better the Hubble relation in both versions is completely different.
 In the first version, with d a distance in the past, the Hubble relation is linear and H is a constant. The same in both figure 1 and 2.
 In the second version, with d a proper distance, the Hubble relation is linear in figure 1 and non linear in figure 2. In figure 1 the Hubble Constant is smaller than in the first version (because the present distances are larger). In figure 2 the Hubble relation it not linear.
Specific what figure 2 shows is assuming there exists a linear relation between z and the parallax distance that that is no guarantee that there also exists a linear relation between z and the proper distance.
The following sketch also shows a different reality:
<z>
1 2 .G
t5 1 2 .>v5
 1 2 .
t4 1 2 .>v4
 1 2 .
t3 1 2 .>v3
 1 2 .
t2 1 2 .>v2
 1 2 .
t1 1 2.> v1
0G
distance d1
Figure 3

The above sketch is based on the following principles:
 That the galaxies, which are the furthest and which we presently can see, have the highest expansion speed.
 That z increases. This increase in z is caused by the expansion of space.
 That z currently increases less than in the past. This decrease is caused by an diminishing space expansion.
 That the current value of z does not reflect the present speed of the Galaxy.
 That the relation between z and past distance in general is non linear. Locally the relation between z and past distance is linear.
 The present state of the universe is homogeneous, in the sense that the universe is everywhere the same now and all the Galaxies have the roughly the same speed (close to zero).
Figure 3 is in line with the following article in Nature:
Figure 3 is in line that with the concept that in the past the universe also was homogeneous. This does not exclude change. Starting from the moment of the Big Bang the whole Universe is changing all the time. One aspect of this is, called: galaxy evolution. We can observe this change because what we see from the past (high values of z) is different than what we see from the present (low values of z). For an article which describes this concept See: The BuildUp of the Hubble Sequence in the COSMOS Field