kittu has the right basic idea here, I think.
The Tsarists developed the Mosin Nagant 7.62x54r rifle in the late 1880s-early 1890s from the designs of Col. Mosin and Emile and Leon Nagant of Belgium. Then, to save money on tooling, they contracted with the Nagant brothers for their 7.62 Nagant M1895 revolver, which used the same barrel making machinery.
The Bolsheviks then developed the TT-30 and TT-33 semiautomatic pistol in 7.62x25 -- again, the 30 bore, which shared existing machinery, and then after WW2 used the same 30 bore for the SKS and AK series of rifles.
Both of these regimes were faced with the task of arming large numbers of people and this required the lowest manufacturing costs possible -- and still, they didn't have enough guns despite having the highest production numbers.
The Chinese depended on Bolshevik technology transfers to solve the same problem: arming large numbers of troops.
Barrel making and bullet size are the same for both 7.62x25 and 32 Automatic (despite the naming of each) and, in my opinion, the 30 bore in any of these cartridges may well be the best bore size of all, if there is the availability of the right bullets for the intended use. The 30 bore is well established in India with both 32 Automatic and 7.62x39 rifle being manufactured.
The points I would like to make with this said is that 30 bore should be a factor leading to cheaper and better guns, and also that 30 bore itself is a great size for modern self defense pistols. Please check out this link relating to 9mm (which isn't normally available) to 7.62x25 Tokarev:
https://ammo.com/comparison/7.62x25-vs-9mm
Also in this realm of cartridges, check out the 9mm vs the 30 Super Carry. The Super Carry offers the ability to carry more magazine capacity than 7.62x25 while only giving up a little in performance, and should be adaptable to any locked breech pistol with a little engineering for the length and some improved metallurgy and heat treatment:
https://ammo.com/comparison/30-super-carry-vs-9mm
While 9mm is admittedly a fine self defense cartridge with the right bullets, the same technology (good bullets and higher operating pressures) that made 9mm succeed in the presence of 45 Automatic where both are available also now makes the new 30 Super Carry a viable solution in the market.
Help/suggestions from esteemed members regarding replacement of my .32 revolver with .30 bore pistol
- timmy
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Re: Help/suggestions from esteemed members regarding replacement of my .32 revolver with .30 bore pistol
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saying in the British Royal Navy