Couldn't you load 7.5 FK to 5.56 NATO specs, and have a pistol / micro-pdw/pcc in the role of a rifle?>inb4 case capacity & maximum pressure Theres already superior powder types which have both higher pressure & a better pressure curveAnd thats alongside just increasing wall thickness &/or using bimetallic cases
>>62874687+p+ Tokarev.They didn't have to "go proprietary". Shit company, shit meme cartridge.
>>62874706It's an excellent cartridge.
>>62874687>load7.5 FK is already hot loaded.Like most rifle and pistol cartridges it requires an appropriately designed firearm
>>62875446It was always pointless and it's going to be totally dead very soon. So good job I guess?
>>62875456Nobody gives a flying gnatshit fuck what (You) brainlets think.
>>628746877.5 FK is already blowing out primers
>>62875467(You)r mom is blowing out primers.
>>62875474What's the weather like this evening in Brünn?
>>62875480Get jabbed then deported, subfilth.
I'd like to inquire as to what's going on in this thread.Is somebody salty because he bought a 7.5 FK handgun and isn't getting the respect and prestige he thought he deserves?Or is it legitimately a FK BRNO employee melting down ITT?
>>62877305I'm not sure
>>62877305OP here, i don't know eitherthe 1st & 3rd replies pretty much answered the questioni'd delete the thread, but its too old
>if I just ignore all the actual physics of reloading can I do something impossible?intentionally retarded spam thread.
>>62877842>if I just ignore all the actual physics of reloadingbecause lighter bullets are super fucking slow, right?
>>62874687The diameter of a cylinder is inversely proportional to the pressure inside of said cylinder at a nominal volume.The smaller the cylinder, the higher the pressure.
>>62878536where does the energy come from?
>>62878899i don't know, anon, where does that energy come from?how would you feel if you didn't eat breakfast yesterday?
>>62878922you can pretend to be clever, but you do not understand the relationship between case capacity, chamber pressure, sectional density and muzzle energy. you don't reload, do you?
>>62878936the only one pretending to be smart is youhow fast would 7.5 FK be going, if it was necked down to .22?are you able to answer the question, or are you just going to say its impossible or that energy is somehow not a real concept?
>>62874687>Couldn't you load 7.5 FK to 5.56 NATO specs, and have a pistol / micro-pdw/pcc in the role of a rifle?you'd blow the gun. smaller the case = higher the pressure.
>>62878948what powder and projectile would you use? or is that too realistic a question for you to actually answer?
>>62878965>powderto make it easy, same load as the 7.5 FK>projectileeither a 60gr .22, or a 7.5 thats been lowered in weight to 60grso again, what would the speeds be out of that loading? are you able to answer this question i am asking? or are you just going to be extremely difficult?its perfectly fine to be unable to answer the question, i'm not quizzing you, i'm asking the question because i myself do not knowthe only thing i do know, is that the load would be faster, since the weight in lowered, but how much faster would it be? thats what i want to know
>>62878974>to make it easy, same load as the 7.5 FKgun explodes because you've nearly doubled the SD of the bullet without changing the rate that the powder burns. if you switch to a slower powder you'll need a longer barrel to achieve the same velocity at the same peak pressure.you should actually reload before ask retarded fucking questions like an underage noguns.
>>62878979<you should actually reload before ask retarded fucking questions like an underage noguns.>wow thanks, let me go reload a round without any knowledge on the subject>oh no, the gun exploded!!!!!!!heres a question, why can a shotshell be loaded with a under weight projectile without exploding?
>>62878993>why can a shotshell be loaded with a[sic] under weight projectile without exploding?shotguns are notorious for not having complete burn of the powder if you don't use a high enough projectile mass. I know this because I reload and have reloaded shot shells with all sorts of shit in them.Actually, it's a great way to blow up your shotgun because the wad will stay in the gun in some cases and if your next shell actually develops enough pressure to burn the powder and not just ride the primer, it slamming into the first wad can very easily blow your barrel or give it a tragic goose egg. that was actually maybe the third thing I was taught about shot shell reloading. do you have ANY first hand experience with load development? do you own any guns? I'm headed to the range this morning to work on more of my handloads.
>>62879013i got a lot of guns, i just don't do reloading yetbut i was being taught reloading a few years ago by an old guy i knew, so i mostly know how to function a setup, i got the tools, i got some booksi just don't know exact loading specifications though, i'm trying to learn, but looking shit up on search engines is getting a lot harder, and the internet is starting to rotsome one the sites i used to go to are gone, youtube videos are being taken down, and stores aren't stocking the supplies in my areaman, i just wanted to know what would happen if 7.5 fk was loaded with a 60gr bullet, not be yelled at for asking said fucking question
>>62879030get GRT and/or Quickloadlearn how to input custom cartridge dimensionsget a chronographthen start reloading.
>>62879036thanks, saved for laterfor now, my main issue is that i don't have a space for the setup yet, and i'm missing other tools, likes dies for the guns i actually use (i got my setup from a different old guy that died, he seems to have liked 270 a lot, along with a few other older used cartridges, i don't own any 270 guns though, but i got guns in .338 lapua, 10mm, 45/70, etc, luckily, he did have .30-06, which i got too)i also need some land to shoot on, since i'm just within city limits where i'm at, but i think i know a guy i can get to about that
>>62879072people are going to screech about it, but get a lee hand press, it'll do anything that is straight wall super easy. it is less fun with bottleneck cartridges. also get a load manual, like Lyman edition 51 or a used 50th edition. there are plenty of others.
Yes, you could. And someone ought to. Similar cartridges have been made/experiments with in the past, albeit with more moderate (<55kpsi) pressures. Carrridges like 5.56 MARS, 5.56 MINSAS, 221 fireball, 22 APG/gustaffson, etc (maybe 6x35mm TSWG but that’s a bit long)Hybrid cases change things now though. Here is a low-effort mock-up I made using the pics on Hornady’s website. It’s flanked by 5.7x28 and 5.56. Scale is roughly on point.I used a slightly smaller 30 carbine case head. Calculated case capacity to be 19 grains or so. 1.25” case, 1.75” OAL (same ogive space as 5.56). I plug the info into the powley internal ballistics computer, set bullet length at 0.75” and pressure to 80kpsi, and the output yields a 55gr bullet at ~2800-2900fps from a 10” barrel.1.75” OAL because I think if you use thin metal mags and a thin metal grip (PSA rock grip - which looks very normal sized - scaled up slightly and made of steel or aluminum), you could still get it to fit into a comfy grip.TLDR: we can have holsterable MP7-style MK18s with present technology.
>>62880624the PSA Rock grip cannot get ANY longer and still be a comfy grip
>>62880624Edit: ok so OP was asking about literally just a high pressure 7.5FK, and yes it would mog, but going down in caliber allows you to use a much finer bullet that’s also lighter and going faster. Bordering on 5.56. The velocities I posted above produce around 950-1000ft*lbs muzzle energy. this is comparable to the 5.45x39. Impressive imo. Doesn’t have the superior bullet shape and BC, but at short range should be very similar.
>>62880657you can't actually up the pressure on 7.5FK any more due to material limitationsby which I mean the primers they're using are currently flowing and blocking the firing pin channel
>>62880646Admittedly I’ve never held one. I don’t think any exist in my state (California). But I’ve seen it juxtaposed against other 5.7 guns and non-5.7 guns whose grip size I am a bit familiar with. Seems it has the smallest and most ergo grip of any of the 5.7 guns. Just increase the discomfort of it to FN Five-seveN levels by increasing length by ~0.1” and using slightly thinner grips. The grip size of the five seven is evidently adequate.
>>62880663Ah well yeah, the case is not designed around 80kpsi (Much less the action of the guns that chamber it). But there’s no reason you could not design one from the group up to run at 80kpsi that satisfies the spirit of what OP wants, which is a PDW-sized intermediate cartridge.
>>62875456Tokarev won WWII, meanwhile 5.56 has only lost a half dozen wars.
>>62880624>>62880657naw, i was mostly asking about 7.5 being necked down / bullet weight lowered to 5.56 levels, the pressure being loaded higher was mostly as a side thingthanks for the cartridge mentions though, i like scheming about how guns could be made more "futuristic", and those rounds are super cool
>>62880663Yes we can, it's just that (((SIG))) doesn't want you to know.
>>628807037.62x25mm Tokarev actually totally mogs 7.5 when cost and availability are taken into consideration. And really they're not THAT different. 7.5 FK is unironically just a loosely modified Tokarev.A modernized Tokarev round can be compatible with existing 7.62x29mm platform weapons and would perform as well as 7.5 FK or better.But FK BRNO had to be maximally Jewish and make proprietary shit for the shekles.
>>62880663>>62880675>the case is not designed around 80kpsiThe case is not the pressure bearing component in a gun. That would be the chamber wall and the breech face. You can make extremely high pressure ammo caseless and it will still work fine as long as the breech is well sealed and the chamber wall is strong enough. The reason we still use brass cases is because it's a soft and easily formable waterproof container for the granular propellant. Problems like case head separation happen because the gun action is poorly designed or poorly tuned, not because of problems with the case material.
>>62880746What’s the difference in case wall thickness with polymer-cased cartridges? I imagine they have to be thicker, right?>>62880842Well, the ductility of brass is a desirable attribute in case construction as well. As far as case head separation, it is absolutely a problem innate to standard brass cartridges AT 80KPSI. That’s why the 6.8x51 uses a steel base. I know the pressure bearing component is the chamber/bolt, but the rim/web area is not fully supported, hence the steel.
>>62880722I see. Well if you like fucking around with hypothetical cartridges/loads, the powley computer is an excellent resource to have.http://kwk.us/powley.html
>>62880990thanks anon, just found the new thing to take up my next few weeks straight & fall asleep thinking about
>/k/ anons what's the best quickest way to blow the front of my skull off and lose appendages>The Thread
