Sebastian took Zhang Qiang's deal with the system to the iron mold cannon method parchment roll to study for half a month, and finally made a breakthrough at the end of the month.

Sebastian sent someone to report to Zhang Qiang, and Zhang Qiang rushed to the gun factory in the mountains of Jinhua Mansion without stopping, and was directly led to the shooting range of the gun factory.

But when he saw that it was still a bronze cannonball, he couldn't help frowning.

Sebastian hurriedly explained: "My lord, this is for the sake of safety, Xia Guan still used bronze as a raw material to experiment with your iron mold cannon method to cast cannons.

Although this is a bronze cannon body, the iron mold is forged from fine iron, and after some experiments, the results are remarkable.

With sufficient raw materials, under the operation of skilled workers, five iron molds were forged in one day, thirty-five iron molds were forged in only six days, and then thirty bronze cannons were cast in two days, and after testing, each cannon could fire two pounds of shells 250 times when the charge was half a pound.

This is at least 10 to 20 percent higher than the original captured artillery of the Ming and Qing armies, which could fire 120 to 150 shells per cannon, and even the bronze cannons cast by the lower officials, which could fire 180 to 210 shells per cannon. ”

Hearing Sebastian's words, Zhang Qiang was not happy, Nima, you told me that you could launch 500 to 600 pieces, why do you tell me now that you have improved the quality of me by 10 to 15 percent, which is still a long way from what you said at the beginning and what you thought.

"Why is this happening?" Zhang Qiang said angrily.

Sebastian said unhurriedly: "My lord, listen to me, the progress of technology, we must take our time, we can't eat big fat in one go, can we?" ”

Zhang Qiang looked at him, and Sebastian looked calm.

Zhang Qiang's heart turned countless thoughts, now he really has no choice, now the Ming Dynasty is repulsive to science, this is something that countless novels have said, there are not many people who can be more outstanding than Sebastian, there are yes, now in the war period, in this era when transportation is basically by walking, communication is basically by roaring, he wants to find those historical cattle, it is still very troublesome, maybe a year and a half don't want to find it, even if you find it, don't want to let people work for you.

After all, it's not enough loyalty.

Thinking of loyalty, Zhang Qiang looked at Sebastian, yes, he is a Spaniard, he came with the Dutch, the Dutch and the Spaniards, that is almost a country person.

Europe is a Ming dynasty with countless princes, but people have not experienced the feudal dynasty period, directly into the capitalist period, the biggest role of the feudal dynasty period is the unification, that is, the period of national integration, the Ming 5,000 years of civilization can integrate countless nationalities to form a unified dynasty.

There are pros and cons to this, the pros are that a country, a nation, is strong, can communicate with each other, communicate with each other, let the economy and population grow, the disadvantage is that the people's hearts are uneven, the faith is disordered, but Europe has always had a thing called religion, put people's hearts together, one heart, at any time with a belief to gang up, find someone PK to fight in a group, you want to fight in China, it is estimated that a conspiracy and tricks, one person can PK a group of people, the people are not aligned.

This guy wouldn't deliberately delay just because he wanted to fight the Dutch.

Or he wants to go back to Spain with such a technique to make a fortune.

Well, foreigners are mostly greedy for money.

Sebastian saw that Zhang Qiang didn't speak for a long time, and said calmly: "My lord, do you think you can start the experiment?" ”

"Let's get started," Zhang Qiang said calmly.

"Boom, boom," there was a roar, and the range was confused.

Try it in turn, two-pounder, four-pounder, six-pounder, eight-pounder, twelve-pounder.

The pound is actually a unit of weight, which means that the weight of the shell is different from the diameter of the current cannon, and two pounds is generally equivalent to a 40 mm caliber gun.

However, it can't be so many as it can be, because it will cause a lot of inconvenience, and after Zhang Qiang unified the unit of measurement, he also unified the caliber of the artillery, and the two-pounder gun was a 37mm gun, and he directly let these guys use calipers and rulers, which he copied from later generations.

Then it was stipulated that the two-pounder gun was a 37 mm caliber, the four-pounder gun was actually a 50 mm caliber, the six-pounder gun was already a 76 mm caliber, and the eight-pounder gun, because Zhang Qiang liked the 88 mm anti-aircraft guns of the Germans, military fans probably knew it, and those who read a lot of novels also knew it, so the eight-pounder gun was directly discarded with 88 mm caliber, and the ten-pounder gun was directly discarded, and the 12-pounder gun with a caliber of 105 mm was the same as that of some later artillery.

This Sebastian would make a twelve-pounder cannon at its best.

This is not easy, with the caliber and the weight of the shells that need to be fired at the cannon are larger, in the Ming Dynasty, the current artillery is still firing iron balls, the more gunpowder that needs to be loaded, the more gunpowder, the greater the pressure on the barrel of the artillery, the higher the technology required, Sebastian can't solve such a technical problem, so he can only build such a large-caliber cannon.

Not to mention that the effect is good, the cannon made using this method has actually increased the range.

Because the pressure that can be withstood is greater, the charge can be increased, and the iron ball of the same weight will fly farther.

At least the firing range of each cannon has increased by so much twenty to fifty or sixty meters, of course, now the cannon, the effective range of the flight is far, not as good as the actual range is better, in fact, no matter how big the cannon shell to hit the target, it is about 300 meters away, because you can't hit the enemy, it's useless, to hit the enemy, you can only improve the gunner's technology, the technology has improved, and the hit rate has also increased.

However, if it is to bombard the enemy's castle, city walls, or even cities, it doesn't matter about the hit rate, the farther away the better.

A two-pounder cannon can basically hit a distance of 300 meters, but the actual firing range is only more than 100 meters, and a four-pounder cannon is not much more, and 1780 meters is enough.

The six-pounder cannon can hit a distance of four or five hundred meters, and can achieve certain results in more than two hundred to three hundred meters.

An eight-pounder cannon can hit a distance of six or seven hundred meters, and a twelve-pounder cannon can hit a distance of one thousand to one thousand two hundred meters.

These are the artillery of the Ming Dynasty, or made under the auspices of Zhang Qiang, of course, they cannot be compared with the caliber artillery known to later generations, they are just to fire those iron balls of smoothbore guns, or such low-tech artillery, in the case of materials and technology are not good to manufacture artillery.

However, compared with those artillery made by the Ming or Qing army, this has improved a lot in the number of shells fired, the quality of the gun breech, and even the range.

It's just that they can't meet Zhang Qiang's quality requirements for himself to exchange a thousand arquebuses for the iron mold construction method.

It's still far from this request, in the words of Indian Ahsan, I paid for the original version, you sold me the monkey version of the weapon, Uncle Russia, are you worthy of those banknotes I gave you?

And Sebastian clearly lived up to the trust he placed in him.

Therefore, Zhang Qiang decided to use the advice given to him by the system to punish Sebastian so that he would not dare to play tricks with him in the future.