Τσοκ ... κωνικά ή κωνικά-παράλληλα ;;;;;; για μολύβι, ατσάλι, βισμούθιο, ψευδάργυρο ...
Μια από τα ίδια εκτός ατσαλιών.
Στα ατσάλια το κωνικό-παράλληλο φαίνεται να έχει λίγο καλύτερη απόδοση ... 59% ->65%
The internal ballistics of the barrel, via choke constriction, have been shown to affect
the downrange lateral pellet distribution, but not the longitudinal distribution. To limit
the possible variation in the experimental set up of the measurement facility, all choke
tubes from 0.000" to 0.050" constriction were produced with a linear taper profile. A
separate 0.020" constricted choke tube was constructed with a 1" parallel section profile
to examine the effect of choke profile on the lateral pellet dispersion. In Table 3.9 the
averaged pellet counts in a 30" circle at 40 yards and their corresponding standard
deviations are given for a selection of material loads. It was found that for the same
constriction the 1" parallel section produced a slightly tighter distribution of pellets at
40 yards than the linear taper profile for every batch of ammunition tested. However,
the standard errors associated with the distribution show that statistically there is no
significant difference between the two profiles, expect for the one steel load tested
where an improvement is seen when using the 1" parallel section profile. Here it has
been established that there is little difference between the two 0.020" constricted choke
profiles, but it has not been feasible to fully investigate the effect of choke profile on the
lateral distribution of pellets, due to the lack of availability of specially prepared choke
tubes for the test barrel and the research priorities.
View attachment 41066