It was because of this fatal flaw that smoothbore guns dominated the world battlefield until the nineteenth century.

But Zhu Linmiao's mind was filled with the method of making the invention of the ending smoothbore gun - the Mini bullet.

In the three hundred years since the invention of rifled guns, human beings have been thinking about how to embed lead beads into the rifling of the barrel, and they have never been able to jump out of this mindset.

The Mini bullet, on the other hand, is a bold subversion, no longer using lead beads as bullets, but instead using sharpened cylindrical bullets. Dig a conical hole in the bottom of the bullet and put a small wooden block in the hole.

The high-pressure gases from the combustion of gunpowder during the firing of the gun pushed small pieces of wood deep into the cavity, and the blocks of wood squeezed the tail of the bullet to inflate and thus jam into the rifling.

With such a design, the bullet does not have to be made thicker than the barrel to produce rotation, the problem of difficult reloading is solved, and even a well-made mini bullet is easier to load than a regular lead ball.

It was this invention that made the world's smoothbore guns quickly become history.

A hunter armed with a rifled gun and a parmini is a sniper of this era!

In the current era of smoothbore guns, no army has the concept of beware of snipers. All the officers were on tall horses and dressed in clothes that were very different from those of ordinary soldiers, and they were instantly recognizable.

Because the bullets of a smoothbore gun like the Bird Gun don't fly in a straight line, no matter how much you aim, you won't be able to hit someone.

But in the case of rifled gun hunters, these officers are very eye-catching targets!

In addition, the Chasseurs also target the enemy's standard-bearers, drummers, heralds, warlords, and even morale-boosting enemies, thus having a huge impact on the entire battle situation.

For example, in this era of extremely poor means of communication, soldiers follow the flag, and without the flag, it will not be long before the team will be out of order.

Once the flag bearer dies, there will be a backup flag bearer to carry the flag immediately, but if the flag bearer is sniped off by the hunters one after another, who will dare to carry the flag again? If the hunters are efficient, they can quickly deal with the standard-bearers of the various teams that are being captured, and then they will be broken up without fighting themselves.

However, the use of Mini rounds poses a problem, and that is the standardization of the barrel. At a time when muskets all over the world are made by hand, it is impossible to expect all guns to be of the same caliber.

A little gap between the lead bullet and the barrel of a smoothbore gun has little effect.

However, rifled guns that use Mini rounds must strictly control the caliber of the barrel, otherwise the bullet will probably not be able to jam into the rifling after the tail is inflated. If the cylindrical bullet does not spin, it is prone to roll sideways, which is not as good as a lead ball.

Fortunately, Su Ji Iron Yard has been making flintlock guns, and now it has accumulated at least about 4,000 guns, and it should not be a problem to select two or three hundred guns of similar caliber from these guns.

If it weren't for the inability to standardize production, Zhu Linmiao would definitely want to replace rifled guns in the whole army. And now only a few companies of hunters can be equipped first.

Lu Ning and other craftsmen had already heard that His Royal Highness King Chen had come to the iron field, and they were looking to see him come with Song Yingxing.

Zhu Linmiao went straight to the point and first told Lu Ning and others about the concept of rifled guns.

The craftsmen all had expressions of "no surprise" and "long expected", and in their hearts, it was not normal for King Chen not to come up with something unbelievably new. However, Song Yingxing looked like he had never seen the world, and he held a pen and recorded it desperately.

Zhu Linmiao took a freshly made pipe from the wooden frame next to him, picked up a branch, and gestured to the craftsmen: "This branch is like a steel rod that is slightly thinner than the mouth of the branch," he pointed to the top of the branch, "open a sloping groove here, put in a hard steel cutter head, and clamp it with screws." ”

He then put the branch into the tube, "holding the rod against it, pushing and pulling the rod back and forth, and carving a short groove in the tube." Then turn the gun tube slightly, continue to push and pull the steel rod groove, and then turn the gun tube. This process is continued until the short grooves of each tick accumulate into a very long spiral groove.

"You need four of these slots per pipe."

Then he talked about the concept of rifling distance, winding degree and so on, of course, these craftsmen need to understand this, and the specific calculation has to be done by himself.

Then he assigned a part of the craftsmen to pick out the pipes of similar caliber, and he took Lu Ning and others to make rifling equipment.

After another whole day's work, with the cooperation of all craftsmen, a simple "wire drawing machine" was completed.

Lu Ning took a gun, clamped it with two grooved hardwoods on the wire drawing machine, tightened the hardwood with several iron hoops, and then poked a steel rod supported by multiple iron frames into the gun.

He repeated the carving more than thirty times before leaving a groove of about three millimeters on the barrel. At the same time, another craftsman rotated the hardwood clamp, and the angle of rotation was calculated by Zhu Linmiao, and there was a dial at the end of the wooden clip, which could be rotated one grid at a time.

Lu Ning, on the other hand, continued to carve a groove.

After nearly half an hour of trying, a thumb-length spiral line was finally carved out of the barrel, and at this speed, it would take at least three days to make a barrel with four riflings.

Fortunately, there were more than 150 people in the firearms workshop, and Zhu Linmiao instructed Song Yingxing to lead the craftsmen to make a wire drawing machine first, and then everyone processed the rifling as quickly as possible.

He estimated that more than 400 rifled guns could be produced in a month, of course, provided that so many barrels of the same caliber could be found.

After the craftsmen were basically familiar with the whole process, Zhu Linmiao went to the workshop to make lead bullets.

Originally, this was the most untechnical place in the entire iron yard, and after melting the lead block, pouring it into the mold, cooling, opening the mold, and polishing it slightly, a lead bullet was completed. So much so that this place is basically the world of apprentices, and there are even family members of craftsmen who earn extra money here.

However, it is much more troublesome to make Mini bullets, and the new molds can be made by blacksmiths, but the requirements for Mini bullets are much more detailed than those of lead bullets.

Zhu Linmiao divided the craftsmen into several batches, casting, cutting corks, and assembling each with a group of people in charge. The most skilled craftsmen are in charge of the quality inspection, and each bullet must pass through just one ring, and the wooden block at the bottom must not be stuffed too deep and not fall out.

Fortunately, the demand for Minnie ammunition will not be very large, and the current production of these people should be enough for future hunters.

Zhu Linmiao ran back and forth between several workshops like this, so busy that she couldn't touch the ground, and she looked forward to the early opening of Gezhi Academy. When a new generation of technicians is trained, he only needs to draw a few drawings or even just say a concept for similar things, and they will be responsible for the implementation.