What exactly makes certain ammo more accurate than others? Why is black hills 77gr so much more accurate than 55gr FMJ? I understand that M855 is less accurate because of how the steel core causes the bullet to be imbalanced in flight. What else about certain loads affects accuracy? Does black hills use bullets with more consistent shape/weight/density?
its complicated
dear diary, today OP was more than just a bundle a sticks. xe was also a moron.
There is nothing moronic about OP's question. How many people on this board are actually qualified to talk about the minutiae of bullet quality control? Probably zero.
most people are still stuck on gucci guns and haven't started to understand the importance of gucci ammunition as well. justasgood cope applies even more to ammo than it does to rifles
Most people here either barely shoot and just magdump shit at 20 yards so don’t care about groupings at distance enough for ammo quality to matter
>2 MOA out of my C308 with Barnaul
Reloading and making your own quality ammunition will improve accuracy far more than going from entry level to Gucci level. Although primers and powders are fricked for the foreseeable future
This. The same reasons a certain brand or weight shoots better is the exact reasons reloaders try to tailor-make rounds for their for a particular rifle.
>why is heavier boolit more accurate than lighter one
Hmm...could it be the quality control? or could it be the very complicated, unheard of notion that heavier shit is less influenced by wind and has better speed retention therefore having a chance to reach the target before it gets destabilized by transonic effects?
You can have very accurate light weight projectiles and innacurate ones as well, SD matters a lot for practical accuracy in the field for the reasons you listed but there are much more important factors for mechanical accuracy when it comes to punching paper at mild or moderate distances when significant wind or going below the speed of sound arent a concern.
Why are you typing like such a homosexual with passive aggressive questions? Are you a woman?
why do you want to discuss a topic with unqualified people, moron?
>its all down to quality control
>not bullet weight
>not bullet construction
>not barrel twist rate
>not lockup
>not chamber design
>it's all quality control
you're missing the context bro. this question was originally asked in an AR thread so most of the answers are based on that. anons sometimes forget it's not just the same 20 dudes here anymore since the PrepHole invasion a few months ago
the smks used in their 77gr load is a pretty forgiving bullet in general but mostly it's about consistency. slight variations in seating depth and powder charge can make huge differences in point of impact, add in inconsistencies in the bullets and brass themselves and bullets seated crooked in the case and it ends up compounding into 5moa garbage
Accuracy is a placebo
I remember seeing somewhere about the build consistency being an issue. Those polymer bullet casings were a big deal because each case would be exactly the same as the previous one so you will always know how the round will mostly perform.
Never actually handled nor fired them before so I can't speak from experience.
from top to bottom:
- bullet special features i.e. hollow point (for accuracy, to create a tiny supersonic air cushion at the tip, not for expansion), boat tail, "obturating rings" for engaging rifling and sealing the gas
- precise machining of the bullet - bullets are all the same in weight and size
- brass doesn't really matter as long as it's clean and of proper hardness and dimensions
- high quality powder burns consistently
- perfect powder load for the barrel length and twist rate - powder burns out at the right moment, sending good vibrations through the barrel
- good primers work reliably and ignite the powder evenly and consistently
- precise assembly - same bullet seating depth, same seating force, same amount of powder
pretty much nailed it.
Brass matters in that they need to have consistent dimensions, especially inner dimensions. If it varies, there will be pressure differences between cartridges, thus causing deviation in velocity.
Yes. Just checked with GordonsReloadingTool - 1% change of volume = around 1% of change in the muzzle energy, more energy the smaller the volume.
It's less a question of "accuracy" and more of "consistency"
More "accurate" ammo loads are just made with more consistency. Extremely consistent projectile weights and shape, extremely consistent powder charges, extremely consistent burn rates of a powder, consistency in brass forming, consistency in primers, etc
When you can manufacture 100 cartridges that, when fired from a bolt action wrenched down in a vice, all make one tiny hole- it's not that the ammo is accurate, it's just consistent and each subsequent round consistently follows the same trajectory. Zero your sights and /then/ you have accuracy
A lot of things. Primarily bullet selection, powder charge consistency, brass consistency and total OAL of the loaded cartridge will be very consistent.
>underage newbie can't even grasp BC
Lurk a minimum of a year before posting homosexual.
he's not even talking about external ballistics bro he's talking about inherent accuracy
Stop samegayging OP.
Obviously heavier bullets are I herently more accurate because of an increase in aerodynamics (BC).
Now have a nice day.
>be wrong
>get mad
many such cases
so my 405gr .45 70 load should b waay more accurate than any 77gr SMK?
Comparing apples to cannonballs?
>Obviously heavier bullets are I herently more accurate because of an increase in aerodynamics (BC)
>The bullet
Two criteria are of importance
A) The bullet design
B) The bullet construction
The 77gr SMK in your image is significantly more aerodynamics than the 55gr standard projectile which improves the practical accuracy of the cartridge at range. There are such things as more or less inherently accurate projectile designs but that's a difficult discussion. Just think in your head, "long pointy bullet = better for long range." As for construction, bullets designed for long range are also typically constructed from higher quality materials. The jackets are more uniform, as are the OALs, Widths, weights, and shape of the bullet. Higher quality bullets are more consistent unit to unit than bulk production military projectiles.
>The Case
There are varying grades of case quality in ammo. More expensive cases use higher quality brass and are more consistent unit to unit. Things like bullet seating depth and neck tension are extremely important for precision ammunition. Quality cases help with these things.
>Powder
There are varying grades of powder. Higher quality powders produce more consistent muzzle velocities.
>Actually loading the case
Higher quality ammo uses higher quality components and is assembled with greater unit to unit consistency than "ball" ammo.
Kek, no mention of twist rate on the barrels. 1/9 is good for 55 grain bullets to 62 grain. 1/8 works well with 62 and 77 grain, and 1/7 is for 77 grain and heavier.
Uh, no.
>Uh, no.
Look it up, dumbshit.
The main factor besides consistency is ballistic coefficient which is a relatively complicated equation but for the most part is based around bullet shape (spitzer nose, boattail, length/diameter ratio) and density.