scrollharmonics

What's the Purpose?

Task:

Take an AR platform and develop a device that will allow you to more accurately shoot various surplus or commercial rounds better than the default config. The device needs to not modify the platform operating system, nor take away modularity or the ability to add devices onto the muzzle end.

Conditions:

Using a store bought or home built AR pattern rifle: design, manufacture, test and implement a method to change the barrel harmonics to shoot various surplus or commercial rounds with more accuracy then the as built config. Do not interact/modify any of the operating systems, ignore dgi or piston, be operator tuneable, dont adversely affect the balance and swing of the weapon, be easier to implement than handloading, and attempt to realize gains to group size with issue/surplus ammo regardless of projectile weight.

Standards:

Define "as built" accuracy potential with the muzzle device of choice, by firing 3 -5 round groups at 100 yards. Preferably with a scope of at least 8 power (16-24 power preferred), so as to be able to hold tight and right on a 1 inch target dot. After the baseline groups, remove the muzzle device as built and clean the weapon with at least a bore snake and 3 passes. Install the harmonizer per the instructions and your muzzle device, and follow the course of fire. At the end of the course of fire, you should be able to fire 10 to 20 rounds with the setting locked in and achieve at least a 50% reduction in group size for from the original 5 round groups that baselined the weapon. Expect to go from 4-6 inch 5 shot groups to 2 to 3 inch or better groups of 10 to 20 rounds.

What will it not do?

This device will not make you the sniper of your group. It will not take a $360 build and make it a $3k "sniper rifle". It will not take every brand/make/model/bullet weight/velocity of round and make it shoot to the same POA/POI. It will not upgrade your shitty, gritty, burred up, stamped trigger. It will not level your scope, rings, bases, cantilever mounts. It will not torque things to spec, so they dont rattle loose on every shot. It will probably not win you a Camp Perry match.

It will not tune a gun that came down to 1.5 inch groups with a 24 power scope from a bench in a lead sled at 100 yards and allow you to replace it with your 3 or 6 moa red dot and shoot off hand and do tactical drills at 100 yards into 1 inch groups.

Why would i want this? Verbose blather.

Please reach us at rangeworks@hotmail.com if you cannot find an answer to your question.

I have multiple AR pattern rifles and multiple manufacturer and bullet weights, surplus and commercial, they are all over the map when i shoot them.

Of course they are, as your rifle barrel is of various manufacturer, chamber reamer, length, contour, weight and probably not what the test barrel they were specced with was. Each manufacturer can do whatever they want on the commercial side and MILSPEC is so overused that i dont have time to go down that rabbit hole. Not only are all of your builds and buys different, your ammo is as well. Here is your MILSPEC call out, notice there are no variances listed and no specifics either.

https://jpeoaa.army.mil/Portals/94/MAS/Documents/MASHandbook_2021.pdf?ver=j0oJCKsqkFYK115bit_gUQ%3D%3D

Accuracy is listed as 6.5 (avg) inches as 600 yards, per this spec sheet, but it does not specify with which weapon system, nor does it state what the barrel length or system the velocity is measured or required for or from. Just saying.

Why do i care?

Well, we all want something to fill the mags and feed the beast with. Ammo is no longer cheap in 2023-2024, so you arent stacking it deep either. IMO, you have 2 choices, you either handload for each platform, or you buy a bunch of different make and models of ammo and shoot all thru your platform until you find one that gives you something close to what you expect. Then you hope that you can go back and buy 1k rounds of that same ammo and lot number and on and on. OR..... you can think thru tunning your barrel to the ammo at hand instead of the other way around. People will spend 30 bucks a box of 20 "defense" or "hunting" rounds and then maybe shoot a couple rounds to verify zero and set a scope, but that is too expensive for plinking. They will buy the cheapest ammo they can find to practice and train. Suddenly they cant hit shit with their "sniper grade" build that they made themselves for the first build ever. It shot great with the 3 rounds of XYZ and now the steelcase training rounds arent even hitting the paper plate at 50 yards, and on and on.......

If i handload to tune the round to the barrel what do i gain?

If you handlload, and i love to handload, you get to choose the bullet, the case, the primer, the powder, the velocity, the seating depth, you can cast the chamber, HOAL the chamber, turn the necks and things that will make it take 2 weeks for you to load 20 rounds. I just spent 4 weeks working up loads for a 6.5 Grendel i build years back, when it was either 6.5 Grendel or 6.8 SPC as the next big thing(vhs/betamax). Now the 6.5 Grendel has "been eclipsed" and the 6.8 SPC was redone by the "machine" and it is a 6.8 in .308 brass. I dont care, as i spent weeks researching when i made the decision to go one way over the other, and handloading was always my intent. i spend a couple hundred on 4 boxes of each of the factory loads that were out there Hornady Black, Custom and some Nosler. Not a one of them shot worth a lick in my gun. 6 inch groups at 100 were more the norm then 2-3" to start. I then went thru TAC, LR-30, CFE223 powder, i really want to shoot the Barnes TTSX in the 120 grain weight, i also shot nosler, sst and eld bullets across the known 120 - 123 weights per the manuals. Then there was the primers: 205, 205m, 400, and 41's. I used the horizontal ladder method to search nodes and then dialed in from there. I adjusted COAL with a Hornady comparator off the ogive. After about 3 weeks of all of that i came to a load that gave me .824 to 1.0 3 shot groups at 126 yards from a lead sled, with a 2x16 scope with the 120 TTSX. I then said ok lets go with 120 Nosler BT since the hornady SST and ELD both were crap. I went back to TAC and in the first round of grain charges 27.3 gave me a .336 3 shot group. So that lead to powder charge variations, determined that 27.3 and 27.4 were definately the node. Then the 1.835 hoal length went above and below in .002 increments 2 above and 2 below that measurement. Then verified again with those best results at 27.4. That then showed me that 1.832 was the best in either 27.3 or 27.4 grains at .495 and that 1.834 was at .940 and that 1.830 was at .860. that also gave me 12 ES and 5 SD for 4 shot groups. So being in the middle allows me to poweder charge variation, as well as seating depth +/- .02 and temp humidity variations and still have the ability to have the GUN perform sub moa. You gain trigger time with the rifle, that is what you gain. i am hundreds of dollars into 1 rifle for 1 load dev. Factory ammo is hard to find locally so i am on that path. i wil now make a tuner for the .264 and see if it can work as it did on the .223 platforms.

If i tune the barrel to the round what do i gain?

Way back in the day, around 1993, i was stationed at Ft Campbell, and Browning came out with a stainless steel stalker with the "BOSS" system on it. I was an E5 at the time with 1 and 1 in the oven. Soooo.... no new rifle was in my future, but i never forgot the "BOSS". I have read stories and seen pictures of snipers in WW2 and Vietnam figuring out their rifles were ho hum as issued, but became sub moa tack drivers when the bayonet was mounted and sometimes the bayonet with scabbard made the day. Over the last 10+ years, i have had some disposable income and with the current situations, i have bought cans, bags, boxes, of 5.56 or 223 when i think XYZ is a good value. This has gotten me danish, malay, yugo, wolf, federal, US, Isreal, etc etc rounds, as well as commercial offers with various weights and constructions. So how do i take these various loads and get the best accuracy i can with the platforms i have? i dont want to spend 3 weeks and hundreds of dollars to dial in 1 platform, and then handload a couple k of rounds for that rifle. i want to buy 1 k green tips, and set up multiple rifles to shoot it better then 4 to 6 inches at 100 yards. The BOSS was a muzzle device that was honestly just a threaded weight that screwed in or out on the barrel to change the barrel harmonics of factory ammo. This means it changed the dampening effect of the barrel whip as various bullets at various speeds left the muzzle. So when i was out cycling guns and scopes and validating everything, i thought, i need to make a boss for these that works with all this different ammo. I am not expecting that every brand and bullet weight will work 1 inch groups out of a battle rifle. i am willing to fire multiple brands and weights of projectile to see what is best, record projectile weight and velocity and start to then see what, if anything, the tuner can do. i will be posting various guns and some of the work ups to see if a tuner can work to improve out of the box accuracy of mil surp and commercial ammo.

Harmonize your barrel to the bullet

Harmonize your barrel to the bullet

What's the Purpose?

Task:

Conditions:

Standards:

What will it not do?

Why would i want this? Verbose blather.

Aim and Shoot - Our Marksmanship Gallery

Contact Us

Drop us a line!

Better

scrollharmonics

Hours

Subscribe

Harmonize your barrel to the bullet

Harmonize your barrel to the bullet

What's the Purpose?

Task:

Conditions:

Standards:

What will it not do?

Why would i want this? Verbose blather.

Aim and Shoot - Our Marksmanship Gallery

Contact Us

Drop us a line!

Better

scrollharmonics

Hours

Subscribe

This website uses cookies.