Using the H90 metal jacket,it efficiently decreases the wear of gun barrel when the DBP10

5.8mm regular bullet spins in the chamber,increasing the general lifespan of the barrels by

more than 15%.

The successfully developed DBP10 5.8mm regular is used with short assault rifles, terminating

living targets within 300m range which have infantry defenses; when equipped with automatic

rifles, it can terminate targets within 400m of the same kind; when being used with Squad

Automatic Weapon, it can efficiently terminate targets of the same kind within 600m range,

suppresses bases of fire and light firearms. When being used in Type 88 General Purpose

Machinegun,it can neutrailise exposed infantry within 1000m range and suppresses enemy bases

of fire. When used with Type 88 marksman rifle,it can terminate single valuable target within

800m range.

The process of development: solving difficulties
In the process of developing the DBP10 5.8mm round, the engineers faced difficulties one

after the other, and with analysis and exploration, they are solved one by one, ultimately

satisfies the usage performances of different types of firearms.

The issue with long range ballistics performance
In the earlier tests of external ballistics, it had failed to meet the tactical indicator

requirement of an 800m ballistics consistency, and had an issue of insufficient margins of

penetration at 1000m range.

Cause Analysis
The earlier bullet tip uses a double arch design (R100/R40), the arch of the bullet is

"fatter", projectile coefficient is about 0.98, in flight it sustained bigger air resistance,

causing a lower placement kinetic energy, At 1000m it was only 200 joules. As the external

ballistics test result shows, there's little penetration margin at 1000m range,and failed to

meet the ballistics consistency requirements at 800m.

Technical Measures
Pinpointing this issue, there had been a redesign of the bullet. According to the principles of

aerodynamics, the tip of the bullet was designed to a special shape,which has sharper arches,

and a projectile coefficient of 0.95, 3% less than the original design, effectively reduces

air resistance,increasing the placement kinetic energy.

Results
By adopting the measures above, the newer design has increased the placement kinetic energy

by about 20 joules, ensured the penetration effect at 1000m and improved the ballistics

consistency at 800m,given the parameters such as the height of the bullet tip, the length of

tail ,the mass of the bullet, muzzle velocity remain the same.

The matching problem of rifles and cartridge systems

During the appraisal tests of the first samples,it had been discovered the rifle system and

cartridge system does not match. A specific example of mismatch is when firing a rifle from

the Type 95 5.8mm family, the pass rate of fire intensity was low; The lifespan of SAW

barrels was only at 12000 rounds, failing to meet the 15000 round indicator requirement.

Cause Analysis
A deep analysis was conducted to the technical problems mentioned above. After investigations

and tests from different angles,it is believed: the insufficient flight stability of the

bullet in the gun barrel was the main cause of the low fire intensity. Bullets severely wear

down the gun barrel,causing a lowered lifespan of it.

Technical measures
After much discussion,the suggested solution was: to increase the flight stability of the

bullet itself, to meet the usage requirements of the Type 95 5.8mm SAW family; redesign the

rifling of the Type 95-1 5.8mm SAW family to adapt to the DBP10 5.8mm regular.

For these, the following technical measures were deployed in the improvement design of DBP10

5.8mm regular.
The steel core diameter has been decreased from 4.1mm to 3.8mm, to increase the lead sleeve

thickness, the length of the bullet has been decreased, appropriately adjusting the centre of

mass position of the bullet, reducing the distance between the centre of mass and centre of

resistance, therefore reduces the moment of inertia ratio of the bullet to increase the

flight stability of the bullet; the metal jacket was changed from using F11 compounded copper

steel to H90, reducing the wear to the gun barrel,in turn increasing the lifespan of the

barrel; Improving the bullet engineering to ensure the assembling compactness of every bullet part, further stabilises,increases the fire intensity.

Results
After improving the proposal, a matching test was performed with the DBP10 5.8mm regular, and

the results indicate: the fire intensity of Type 95 and 95-1 SAW family have met the

indicator requirement, barrel lifespan can reach 20000 rounds.