Also, I am not very surprised that this MG had a 24 round mag, because the 6.5mm version looks a lot like a successor to the 8mm version that was made for tanks, but lost the competition in favour of the Breda 38. More infos here: Mitragliatrice Breda Modello 1938 per Carri Armati - Tank Encyclopedia
Testing recoil with stock soldiers + no crouching? No wonder you can’t control the FG 42
So I found a source discussing British tests of this weapon, I have already forwarded it to a community helper.
The big things are that the rate of fire is listed at 780-800 RPM. It also claims that the magazine capacities are for 25 and 50 rounds respectively, but they only tested the weapon with 15 rounds. Combine this with the Italian books claiming the large magazine holds 40 rounds, I believe the British tests are incorrect on the magazine capacity.
I think your illustration is correct. 20 rounds for the small magazine. 40 for the large one.
probably, while they were putting 25 rounds into the magazine, they broke the spring, which is why it stopped feeding more than fifteen rounds.
They literally only had 15 rounds of 6.5x52mm carcano to test the weapon, it’s not that they couldn’t fit any more into the magazine.
are you forgetting the elevator spring, how can you put 17 bullets? and the spring? where is it? if we go by that logic the madsen should have around 29 bullets (because it is a single-row magazine) even not to go far from the game, the BREDA PG carcano 6.5 mm has its magazine uncovered and you can see the space it leaves is quite wide to load the next bullet being a double-row magazine, now imagine a single-row one? and another example is the STG 44 magazine (according to what I understand) was single-row, that’s why it was huge with only 30 bullets
Look at the model of the Madsen machine gun, which is also single-row, and you will see that there is no difference. Compare the thickness of the Breda PG Carcano 6.5 mm magazine and you will see that the Breda is wider because it is double-row, not just single-row.
that they are short has nothing to do with it, look at their thickness, being double row gives more capacity not the length, if a double row magazine can hold 15 bullets it is because it was made wider for that, if a magazine is single row, it has to be longer to hold the same amount, it is basic mathematics, if not look at the STG-44 it has an enormous magazine to hold only 30 miserable bullets, bravery does not take away from stupidity my friend