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 The problem of bullet spread with hot gun barrels
 After metal jacket being changed from F11 compounded copper steel to H90 copper, during the
 
-tests on consistency of point of impact, it has been found out that when fire from a hot gun
+tests on consistency of point of impact, it has been found out that when fired from a hot gun
 
-barrel, there is a wide spread of points of impact,showing a shooting deficiency of poor
+barrel, there is a wide spread of points of impact, showing a shooting deficiency of poor
 
 consistency on average point of impact.
 
 Cause Analysis
-After some analysis,it was believed the main reason for a copper metal jacket bullet causing
+After some analysis, it was believed the main reason for a copper metal jacket bullet causing
 
 a widespread points of impact with a hot barrel is a mismatch between the metal jacket and
 
 sizes of the barrel rifling. When the barrel is hot, the barrel and bullet change their
 
 shapes simutaneously, affecting the size match relation between the gun barrel and the
 
 bullet, causing a reduction to the gun barrel's spin lead side pressure to the bullet, lessen
 
 restrictions to the spinning momentum of the bullet, the spinning speed of it when it's in
 
 the chamber and at the muzzle would also decrease, enlarging the nutation when it exits the
 
 muzzle ( When the angular velocity of a rotating object is not big enough, the axis symmetry
 
 will sway on a plane, that sway is called nutation). Moreover, in comparison to the
 
 compounded copper metal jacket bullet, when copper metal jacket is heated up there will be a
 
 larger reduction on its toughness, so firing it through a heated gun barrel makes it easier
 
 to cause the flaw of a bigger bullet spread.
 
 Technical measures
 The number of rifling grooves has been increased from 4 to 6,spreading the yawing force of
 
 the gun barrel to the bullet's rotation; the diameter of the grooves has been adjusted from
 
 5.8~5.84mm to 5.82~5.86mm, the diameter of the lands from 6.01~6.07mm to 5.98~6.02mm,
 
 reducing the embedding capacity when the bullet rotates in the chamber. Also, changing the
 
 barrel leads of Type 95-1 5.8mm short automatic rifle and automatic rifle from 240mm to
 
 210mm, equaling that of the SAW,increasing the rotation speed of the bullet inside the
 
 chamber.
 
 Results
 BY undertaking these measures, DBP10 5.8mm regular will meet the qualification requirements
 
 of point of impact bias at 100m range of rifles, carbines, squad automatic weapon under the
 
 condition of cold and hot gun barrels, and there is significant improvement under the hot
 
 barrel.
 
 A valuable innovation
 The DBP10 5.8mm had gone through much difficult exploration to succeed,and the highlights of
 
 its innovation can be concluded as follows.
 
-Realising the "One cartridge nine rifles" unisveral design
+Realising the "One cartridge nine rifles" universal design
 With rifle seriation, universal design, to realise the "One cartridge for multiple
 
 firearms",which has long been a goal for the cartridge designer. The success development of
 
 DBP10 5.8mm helps combining the DBP95 5.8mm and DVP88 5.8mm into one cartridge,and be used
 
 with both Type 95-1 SAW family (3 firearms), Type 95 5.8mm SAW family (3 firearms), Type 88
 
 General Purpose Machinegun,Type 88 5.8mm Marksman rifle and Type 03 5.8mm automatic rifle,
 
 bringing huge convenience to firearm ammunition production management, simplification of the
 
 production line, storage, training, supplement during war times and general usage. In
 
 comparison to other small arm cartridges around the world, DBP10 5.8mm regular is in leading
 
 position at general technical performances.
 
 Increased knowledge to copper metal jacket bullet
 Before the design proposal of DBP10 5.8mm regular takes shape, all bullet cases made in the
 
 country were using F11 compounded copper steel, to meet the requirement of 15000 rounds for a
 
 SAW barrel lifespan, with DBP10 5.8mm it has broken that general rule, boldly using the H90
 
 copper. This change would bring a flaw that is lesser fire intensity with a heated gun
 
-barrel, repeated tests show apart from the risen temperature of the gun barrel in continous
+barrel, repeated tests show apart from the risen temperature of the gun barrel in continuous
 
 fire, rifle groove diameter, the number of grooves, cross section of the bullet and grooves
 
 have contributed to the flaw. This discovery has shaken our traditional theory and design
 
 method in designing small arm ammunition, and will provide a valuable theoretical basis to
 
 the development of small arm ammunition for our country in the future.
 
 Using spline shaped tip for a bullet design for the first time
 Bullet shape had been designed in shapes of single or double curves, though with DBP10 5.8mm
 
 bullet tip it was designed with a spline shape for the first time,which is according to the
 
-principles of aerodynamics, jointing non-continous points with calculation to form a shape of
+principles of aerodynamics, jointing non-continuous points with calculation to form a shape of
 
 a curve. As tests show, the coefficient of projectile of DBP10 5.8mm's spline shaped bullet
 
 was 3% less than that of the DVP88 5.8mm machine gun ammo (R100/R40 double curved bullet
 
 shape), substantially increases the terminal kinetic energy of the bullet, thus ensured the
 
 terminal penetration power and consistency of ballistics.
 It was our first try on developing a small arm cartridge. With in success of DBP10 5.8mm
 
 development, it signifies an important breakthrough and innovation at small arm ammunition
 
 design, and this cartridge has rather tactically solved a contradiction between muzzle
 
 impulse, terminal penetration power,fire intensity, and reliability. It also rather
 
 technically managed the relations between internal and external ballistics, ammunition and
 
 firearms, structure and choice of material, showing a unity to tactics and technology, the
 
-characteristics of the cartridge have been fully epitomised.
+characteristics of the cartridge have been fully epitimised.
 
 Picture Caption: Effects of DBP10 5.8mm regular penetration a ballistic soap block. The muzzle velocity of the bullet is rather high, so it penetrates in a straight line for a long distance before it tumbles as the speed reduces, creating a big trauma cavity.