Drive band bullets are
different from standard bullets and easier to
Follow the procedure
below, it differs from the procedure you would follow with other monometal
bullets or jacketed lead bullets.
Please read all of it to
save you time and money.
bullets are different from standard bullets and easier to
If you follow the procedure
below, you should complete your load development for speed and
accuracy in the minimum of shots. If you need to fire more than 21
shots, something is wrong and you are welcome to contact GSC so
that we can help.
Always use a magnum primer with drive band bullets. Do not
crimp drive band bullets. See the reason.
Prepare cases properly. Do not expect good results with
bad preparation. See our loading tips.
may produce maximum speed in some rifles. The start loads in our tables are
safe loads in our experience but not minimum loads. Start loads can be reduced, if required.
Develop loads with a chronograph.
Develop speed first by loading one or two cartridges
at the start load and one or two each increasing
incrementally. If your chronograph is reliable, one load at each
charge increment is sufficient. Increase the load with
approximately 2% steps of the start load. (Eg.: 10gr start
load = steps of 0.2gr, 25gr start load = steps of 0.5, 50gr
start load = steps of 1gr and 100gr start load =
steps of 2gr)
indicated maximum speed in the tables, after adjustment with the
FPS/INCH number, will closely correspond to the maximum pressure allowed
for that caliber. The indicated speed in the tables is the
maximum speed, it is not the recommended speed.
your rifle, the load that gives the maximum indicated speed is also the
maximum powder load and it must not be exceeded. The
indicated speed in the tables is the maximum speed, it is not the
The powder load required to reach the MAX FPS will differ
from rifle to rifle and the suggested start load will give varying speeds in
Do not try to adjust grouping by varying speed. Drive band
bullets are relatively insensitive to tuning with speed. Groups are tuned by
varying cartridge overall length (c.o.l.).
See the notes on cartridge overall length.
It is therefore best to separate the two processes and to
develop speed first with no regard to what grouping is.
Using the start load, load the bullet with two drive bands
into the case neck.
Check if this cartridge overall length (c.o.l.) will fit
in the magazine box of the rifle. If it does not, seat the bullet deeper
until the cartridge fits the magazine.
Check if the c.o.l. will allow the cartridge to chamber.
If it does, continue with speed load development.
HV and FN bullets do not cause pressure spikes when loaded
touching the rifling. See the reason for this.
the desired speed, on which
you have decided is reached, load 15 rounds with that powder charge and at the maximum cartridge length possible in the rifle.
We recommend to load 50fps to 100fps from the maximum speed for general use.
Fire three for group. Run a dry nylon brush through the
barrel and allow it to cool while the group is measured. Seat the next three
rounds 0.5mm (0.02") deeper and fire for group. Repeat the process until it is
established what the ideal c.o.l. is for the rifle. Use 1.0mm (0.04") steps if
the bullet is over 100 grains.
for pressure and the signs for excessive headspace caused in the loading
process, are virtually identical. If headspace/pressure signs occur at
substantially lower speeds than the maximum speed indicated, make sure a
magnum primer is used. If headspace/pressure signs are still present
at low speeds, check that the sizer die is correctly set, according to the
procedure described at this link
*Should you need any information regarding load development
and suitability for specific calibres - which are not to be found in the tables
or if your caliber is not listed, please e-mail us.
is reviewed as components change and the tables are adjusted on an ongoing
*The load data tables represent
data collected from internal ballistics software, pressure test data from
certified laboratories and load data developed by us. Start loads can be
used in any rifle in good condition but the MAX FPS number must never be
exceeded and must be approached as all maximum load data is approached - with
caution and with checks for signs of pressure.
Do not use HV, FN and SP bullets load data for any other
type of bullet, our HP range included. Dangerous pressures may be
generated, leading to damage to the firearm and injury. See the HP Load
Data for HP loads and consult the load guides of other manufacturers for
data concerning their products.
Band Bullets allows the reloader to achieve higher speeds, weight for weight, than with lead core
or grooved bullets, without exceeding maximum pressure levels.
2. External ballistics always improve with additional
speed and, contrary to what is the case with lead core bullets, with HV and FN
bullets, terminal ballistics always improve with additional speed.
3. The exception would be
if you require only standard speeds and want to reduce recoil. HV, FN and SP
bullets work at lower pressure levels and therefore reduce recoil at standard
and lower speeds.
4. Internal ballistics are
superior with HV, FN and SP bullets in all cases.
5. Use our HP Bullet range
at normal speeds if you do not want the advantages that drive band bullet
technology makes available to you.
6. Use an HV, FN and SP
bullet that is recommended for the calibre and twist rate. See our Tech Data
pages for assistance.
7. HV, FN and SP bullets do
not raise pressure levels like jacketed lead and standard and grooved monometal
bullets do, when seated against the rifling.
For more information see the "FAQ" section of the
Bullets, situated in Port Elizabeth on the East Coast of South Africa,
manufactures solid copper, turned, monolithic bullets for hunting and sport
shooting. These bullets are used by hunters on several continents, hunting from
the smallest of antelope to the largest of dangerous game, using the smooth HP
bullet, as well as the more popular HV, FN and SP bullets with the patented
drive band concept. GSC bullets are configured for the highest possible
ballistic coefficients. SP bullets are mainly used for sport shooting. All GS
Custom Bullets are coated.