from the oldest to the newest:
The D Dupleks from Latvia

taken from the website: http://ddupleks.dev.burti.lv/EN/articles/show/hunting-ammunition

The D Dupleks slug making experience beginnings started in times when Latvia was still incorporated in the USSR. Back then, mostly smooth-barrel weapons were available to local hunters; this facilitated developing and improving new and alternate technical solutions. Also nowadays, every next D Dupleks slug design is developed considering the latest science and technology achievements, to achieve even higher accuracy and effectiveness. D Dupleks has 20 years of experience in steel slug production, and its products are highly regarded in the hunting community.
D Dupleks steel slug production uses the latest technologies and productive high-precision machinery; it ensures constant and high product quality. The sophisticated slug making process is performed with various metal-working machinery and other computerized processing equipment. Every stage of production is under strict control, thus ensuring flawless performance of any product.
Monolit 28, Monolit 32, Dupo 28, Rossa 32 and Hexolit 32 slugs have polyethylene rings in their frontal part and stabilizing wads in the rear part, which ensure flawless shotshell case crimp opening and centering the slug body within the barrel. The diameter of the steel slug body for every gauge is calculated in such a way to ensure fully safe slug passage through the narrowest possible standard shotgun choke. Also, length dimensions of slugs are designed to be no less than the diameter of the barrel. This eliminates the possibility of the slug to twist in an acute angle and damage the internal barrel surface during the shot.
The polymer ring on the slug’s frontal part is pressed onto the steel body under high pressure with great accuracy. Thus, it is capable of resisting heavy loads during the first moments after firing, as well as ensuring perfect slug centering and its safe passage through the barrel. The forces acting during a shot facilitate pressing the plastic parts into the slug body. Polyethylene parts pressed onto steel body have better sliding characteristics; they do not create fouling on the metal surface and effectively prevent damage

Fast and accurate slug for long distance shooting. The slug body is made of steel and has a galvanized coating against corrosion. The recoil is short and soft, allowing fast aiming for the next accurate shot. It is especially suitable for semi-automatic shotguns. The slug is highly resistant against ricocheting and has an excellent capability to cut through various obstacles such as tree branches, bushes and dense grass. When shooting through obstacles - the slug retains initial trajectory well. On hitting the target, the slug ensures powerful impact. It does not disintegrate during the hit and therefore does not contaminate the meat product. The modified Monolit 28 Sport slug with a reduced propellant load can be quite effectively used in sports shooting.

http://ddupleks.dev.burti.lv/EN/ddupleks_products/show/Monolit28

A powerful slug of the Monolit series with a 32 g weight provides high accuracy results in areas extremely densely overgrown with bushes and grass, where rifled weapon use is ineffective. At the moment of hit, Monolit 32 bullet provides especially strong impact. The flat frontal surface ensures complete impact energy transfer to the target. The slug body is lathe-machined, enclosed in a polymer casing and centered ideally, thus being very accurate. Slugs do not contain lead and do not foul barrels with lead foil and burned waste.
Monolit 32 slugs have found their use in a quite extraordinary economic sector – non-conventional farming. Outdoor cattle farming has become quite popular. When large bulls and cows born outdoors and after grazing in vast areas all year long have reached proper age and dimensions, a need emerges to extract them from this environment. A three or four year old bull of the Scottish Highlander breed weighs approx. 1000 kg. Extracting such half-savage animals from their environment is rather problematic – it is impossible to capture them.
Over the years, farmers have found the best solution, make awell-aimed shot from a 35-50 m distance at the animal’s head between the horns. Monolit 32 slugs loaded in 12/70 gauge shotshells from a 20 m distance punch through steel plate of 6 mm thickness. Such proven slugs easily penetrate an animal’s forehead bone, and their powerful impact kills an animal at once. The abruptness of this effect is confirmed by meat product biochemical analysis. Initially, rifles were used for this purpose, but several cases when animals were wounded by bullets rebounding from the thick forehead bone speak in favor of using Monolit series slugs. Even if the aim was not perfect, the large frontal slug surface area knocked down the animal effectively. The Monolit series slugs have not yet been tested in big African game hunting, but the experience obtained in large cattle farming suggests that these slugs would have a high stopping effect against African buffalo.

http://ddupleks.dev.burti.lv/EN/ddupleks_products/show/Monolit32

A slug with a fast and powerful stopping effect. During the first moments of hit, it expands to a maximum diameter of 3 cm and provides strong impact within the whole expansion area. Meanwhile, the slug blows a huge portion of air through the entrance hole, causing a powerful pneumatic shockwave on vital organs – respiratory, circulatory and neural systems. The internal pneumatic blow is the strongest effect of Dupo 28 slugs. Increased initial velocity allows using these slugs in driven hunting for shooting fast-moving targets without an especially large forward lead. The straight flight path allows long-distance slug shooting without vertical correction. Dupo 28 is a highly accurate slug ensuring fast and effective impact energy transfer, and an additional pneumatic shockwave inside the animal body.

http://ddupleks.dev.burti.lv/EN/ddupleks_products/show/Dupo28

This slug exhibits good accuracy in long distance shooting, thanks to a specially centered slug body. Good penetration capability combined with a large expansion effect makes this slug very suitable for big game hunting. The large slug entrance hole creates massive blood tracks,even in case of a bad hit. After hitting the body, the Rossa 32 slug performs powerful and deep penetration, usually remaining in one piece and not splintering apart.

http://ddupleks.dev.burti.lv/EN/ddupleks_products/show/Rossa32

A slug with an extremely enormous impact effect. When hitting the body, the frontal part of the slug instantly increases from 18.5 to 36-38 mm in diameter – this is the largest slug expansion diameter ever known. It creates an entrance hole with a 3.5 cm diameter, hits powerfully with all its expansion area and disintegrates into six symmetric splinters. The splinter cone causes an extensive area of damage. The unified effect of a hydrodynamic and pneumatic shockwave inside the body, along with splinter damage, ensures an unique instant stopping effect with the Hexolit 32 slug, which provides good results even with imperfect hits.
http://ddupleks.dev.burti.lv/EN/ddupleks_products/show/Hexolit32