Why do we shoot copper? Isn't that a bit expensive to be shooting? Why not aluminum?
>>62117125Aluminum isn't very ductile and has a poor friction coefficient. It would weld itself inside your barrel.
>>62117142Oh and when it oxidizes, it will wear the fuck out of your barrel. There's a reason why aluminum oxide is used as an abrasive.
>>62117144is there no cheaper option?
>>62117155Brass (technically copper jacketed bullets are a high-copper brass but you know what I mean) or steel. They're hard and put more wear and tear on the barrel. There's not a cheaper option that comes without these drawbacks.
>>62117155yeah. plastic. BIG CU doesnt wants to bury it though
>>62117142I thought it was due to it having worse ballistic properties to all other options while being more expensive. Not as soft as lead or copper, not as heavy as tungsten or steel, not cheap like lead or steel, and if you want some stupid light projectile we have 223 sabots for 30 caliber and all the 10mm lego heads
>>62117125How do you not know the basic differences between metals? >>62117155Lead balls. You sound poor.
>>62117205there's plastic in your ball sack
>>62117125copper isn't really that expensive as metals go
>>62117142Aluminum isn't dense either, which matters because you want to cram as much mass as you can into the small size of the bullet as the sectional density is directly proportional to the mass of the projectile.That's why lead is so popular for bullets.
>>62117125Because aluminium always forms aluminium oxide on it surface to stop reaction with oxygen.Now if a jacket rubs of very quickly within a barrel and gets hot the raw exposed aluminium will most likely do a funny with the barrel and the ball.
>>62117467Yes but we are talking about jackets.
>>62117125Lead is perfect. Well, gold would be perfect too but we don’t have enough of that.
>>62117125Copper has a high mass and a high ductility. Along with lead, which we also shoot.
>>62117125If you copper jacket thicc enough you can shoot with whatever.
>>62117125aluminum would just weld itself inside the barrel and also eat it up, and as it fouled the barrel there's a potential for it to explode (aluminum powder is extremely dangerous).better question: why no polymer cladding?
>>62117432everyone has, he aint special!
>>62117763See >>62117432
>>62117264Funnily enough the low density also fucked with the gyroscopic stabilization. CETME tried a light recoiling but accurate at range cartridge by using aluminum but they had to use a copper sleeve like a driving band as the added mass would restore the spin stabilization effect.
>>62117457why do crackheads hunt for copper then?
>>62117155>but the moneyyyyyy, beautiful money
>>62117144why don't they make the barrel out of a harder metal like diamond?
>>62118042Too heavy. A pound of diamonds weighs like five kilograms.
>>62118042Imagine the costs of forging diamond. It's simply too hard of a metal, it'd break almost any equipment. Things would cost too much.
>>62118065but what if we made the equipment out of diamond and crashed it into an iron wall
>>62117125We don't shoot copper dipshit, we shoot targets.
>>62118065They make synthetic diamonds now
>>62117125Because it's too light.Real question, why aren't we shooting galvinized steel?>cheap(er than copper at least)>good ballistic properties>resistant to corrosion>lubes up the barrel with zink on every shot.Has it ever been tried?
>>62118052Should I kek or is you normie?
>>62118052This is also why we don't use diamond in body armor
>>62118027Because they're crackheads.
>>62118027they recycle it and get a check from the recycling plant. takes a lot of copper to buy an 8 ball though
did all these threads land at the same time? this a question you should Google, you stupid ape.
>>62119651>nooooo discussion is bad we need more /pol/ Ukraine threads!
>>62118252How are going to make that equipment???>>62118286>off brand diamond barrels
>>62119671>no, we more intentionally retarded spam threads!!111!1!1!1so here's the thing, I'm just gonna point out every one of your fucking spam threads. I'm never going to abandon my board, so you can fuck off and kill yourself.
>>62117763>why no polymer cladding?Polymer coatings are a thing, look up powdercoating bullets.
>>62118027Because it's easy to find. Other metals can be worth much more to the scrapyard but your average crackhead has no idea where to find them.
>>62119701>so here's the thing, I'm just gonna point out every one of your fucking spam threads. I'm never going to abandon my board, so you can fuck off and kill yourself.did you take your medicine today?
>>62117432Ball SAC.
>>62118052Based
>>62119746Yes they do, who do you think is stealing all the catalytic converters?
>>62120050That's fair, they certainly know where to find those. But stuff like tungsten, nickel, titanium, high alloy stainless...nah.
>>62118052>A pound of diamonds weighs like five kilograms
>>62120119By volume, anon
>>62120124the word you're looking for is "density", ESL-kun.
>>62118027dumbBack in 2010, in my country a kilogram of copper was worth of 6 USD equivalent.It might be worth more now, and worth more in US. But again, not much.And you will have to steal a lot of wire to get that kilogram.
>>62118042>harder metal>like diamondsi thought those were made of like, carbon
>>62119333Wasted trips on an esl retard.
>>62117205>>62117763Federal Syntech
>>62117125Density to keep spin stablization and energy, soft and ductile to seal the gas and sit&engages the rifiling, low friction enough to not embed itself to the barrel/feed ramp as much. Formable from tubings and punched sheets with die and press.Aluminum worked as sabots before. Larger tank gun now uses lighter materials like carbon fiber and 50 cal SLAP uses polycarbonate
>>62117142Aluminium very ductile. Has an long strain value of 17,2%. Copper has a long strain value of 11,6%.Problem is Aluminium oxidises naturally and this oxide is a ceramic and is very rigid. When shot you'd most like get the oxide into the grooves of your barrel or a jet of aluminium oxide blasted out of your gun. If the welding into the barrel happens first, like you said.
>>62117188polymer coated lead shouldn't wear the barrel and i think it might eventually get cheap enough. its still pretty new
>>62125507ranges will ban it. Imagine your range being polluted by thousands of colorful specks
>>62125507Maybe graphene polymers that self lubricates.
>>62117125Gold would make a fucking awesome bullet but it's too expensive. We wasted it on shiny metal bands and jingly neck bullshit.
>>62117144Isn't aluminium a non-rusting metal?
>>62128387It is, but it can still oxidize. The surface layer oxidizes almost immediately after being exposed to air, and that thin layer of aluminum oxide is extremely tough and is actually what protects and keeps aluminum from rusting.
>>62128387Aluminium doesn't rust because it immediately forms a thin layer of rust inside atmosphere preventing it from further rusting.
>>62128473>>62128514So if aluminium was in a vacuum, it wouldn't rust?
>>62128531Yep, same is true for (nearly?) all metals.And extra fun fact for you, if you take 2 pieces of metal w/o oxide layers in a vacuum and touch them together they'll weld, this is called cold welding.
>>62128531correct. If you ever do a real fine pass on something like a fly-cutter when machining aluminum you can actually watch it oxidize in real time.
>>62128614>>62128669Cool. That might be a problem for guns operating in a vacuum.
>>62117125Copper is easy. Simple as that.
>>62127480Who cares what the backstop looks like?
>>62125507>it might eventually get cheap enoughMy dude what do you think powder coated bullets are.
>>62118042>>62118052Well played
>>62128254If you think plastics are toxic, then graphene will blow your mind with how biology wreckingly poisonous it is.
>>62128767it's going to get all over the floor too
>>62118252it would cheaaper to make the equipment out of wall and crash it into a diamond iron.
>>62122533most things on the periodic table are metals, carbon isnt one of them though
>>62117144well then, how about just making whole bullets out of a crystallized aluminum oxide that can be polished, aka sapphire/ruby. checkmate
>>62128257>Man with the golden bullets.
>>62129271>Sapphire>9 on the Mohs scaleI'm thinking this is a Bad Idea.
>>62117763There's polymer coated bullets available, but getting the coating exactly perfect to not interfere with accuracy is very difficult. They're fine for duty pistols that are shot inside 20 yards or so, but long range shooting becomes a problem.
>>62129271>>62132363Surprised no guntubers have tried it yet. Demoranch had a big chunk of synthetic sapphire he shot at to see how bulletproof it was and it held up well (though it was fucking thick), so it'd be interesting to see what calibers the bullets could survive.
>>62128848Again, who cares. Just hire a retard to scrub it.
>>62134009>Just hire a retard to scrub it.Ok. Are you free to scrub the ranges on wednesday and sunday nights?
>>62128473>>62128514This is true, but it's also possible for the oxidative corrosion to proceed further in the presence of a suitable electron channel. Moisture, salt, and/or contact with incompatible metals can cause aluminum to disintegrate completely into a fine white powder. It's important to apply extra protection measures to aluminum if it is expected for it to be exposed to these conditions
>>62117142>laughs in copper-jacketed 27gr 5.7mm
>>62132363>>62132573It would absolutely annihilate the rifling. Generally, you want your projectile to be softer than your barrel.
>>62120354Nah copper is still 3 and change a pound
>>62128756what does the aluminum core at the tip do? why not just have a solid lead core?
>>62117125UV bullets when?
>>62118052Yeah, way heavier than a pound of steel or a pound of feathers for that matter.
>>62135467How about a non-rifled shotgun slug?
>>62118027It tastes better than lead
>>62136399probably to alter weight distribution and make bullet less nose heavy
>>62117763Kansas state law bans plastic coated bullets.
>>62117125They aren't made of lead?
>>62125507It's been a thing for ages.>>62127480It's been a thing for ages.
>>62139791Have you today discovered jacketed bullets, a technology introduced into military service 100 years ago?
>>62139711Only if it's armor piercing and pistol calibers.
