The "Outing" magazine article has some serious errors with the chronology of arms.

examples:

1. Error Regarding - Snider Breech-Loading conversion of Enfield M.L. Rifles and sale of unconverted Enfield Rifles to American C.W. combatants.

(The British Government Enfield-Snider-Conversions were performed after the American Civil War.
The .577 caliber "Enfield"-Muzzle-Loaders, used by the Confederacy and Union forces, were privately made copies by Birmingham and London based manufacturers. These arms were 'commercial proofed' by private Proof-Houses and are usually marked with the rather misleading and official-sounding "Tower" name.
Adding to the confusion, the British Government also purchased privately made 1853 "Enfield" Rifles, marked "Tower", in the mid-1850's during the Crimean War).

2. Error Regarding -The mention of Gras and Chassepot rifles being used during the Franco-Prussian War-1871.

(The Chassepot needle-gun along with numerous other supplemental arms were used by the French Military, during this conflict.

The Gras rifle came later. It was a metallic cartridge conversion and update of the combustible cartridge Chassepot).

FWIW - Old literature, (just like recent & current literature and the internet), can be a wonderful source of information, but, it also creates or perpetuates many myths.

Also, BTW - Human creativity, being what it is, after the "Dum-Dum Bullet" was banned by Convention, the British devised a light-nosed 'Spitzer' pointed projectile that 'tumbled' on impact, to create severe wounds.

(The English are a diabolical people, as my ancestors learned).

Here are your Dum-Dum bullets.  Just a few examples though any metal patched lead tipped bullet will suffice as a "Dum-Dum".  Even Sierra's (or any other bullet makers's bullets for that matter) TMK style are dum-dums since the plastic tip replaces the mallibility of a lead tip.

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You could say FMJ and AP bullets save lives by just boring holes in the enemy or an animal.

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The link 'Culpeper' provided, to Wikipedia's "Dum-Dum" article, takes you to an interesting read and some good graphics.

There is an interesting BMJ 1896 article on the origin of the 'Dum-Dum Bullet'.

The German propaganda piece displays:

"The Notorious Dum-Dum Projectiles

with such middle/core works 
(maybe this is an idiom meaning - "made with altering cores"?)

of Germany's Enemies".

The Wikipedia article discusses the 1899 Hague Convention which 'banned' the use of military expanding-bullets in warfare.
The participating Nations voted 22 to 2 against "Dum-Dum" style projectiles.
Britain and the U.S. (Gen. Crozier) defended Military use of expanding bullets.

I have marked the German picture of "Dum-Dum" projectiles.
The first two 'Balle D' spitzer rounds appear to have had their 'points' slightly deformed.
The third projectile appears cut by pliers.
The fourth cartridge is a 'Balle M' round, with a cavity drilled into the normally 'flat-nosed' bullet.

(Note - Because the French Lebel model infantry rifles and carbines had tubular magazines, provision had to be made to prevent bullet noses from contacting the primers of cartridges 'lined up' in the magazine tube.
The cartridge case shape worked to a degree, but, the flat-nosed "M" projectile and the later 'Balle D' circular groove, around the primer-pocket, assured there was no chain reaction in the magazine-tube).