223 16" AR15 4000+fps 53gr TSX

[Rock Knocker]

I'm blown away.

LC brass, HBN coated 53gr TSX, 26.9gr H322, 1-8 twist BHW 223.

This picture I just shot today, two shots were from 100 yards and three shots from 270 yards. I was using a folded gun case laying in the snow as a rest and accuracy suffered a bit.

by [URL='https://www.flickr.com/photos/160224119@N0l'],
This was my first test beyond 100 yards. I fired 3 shots at 300 yards. My aim point was to rest the horizontal crosshairs on the top of the box, I wasnt concerned with horizontal grouping, i just wanted to measure the drop.
3[/MEDIA]

My 100 yard zero is just over an inch high. My leatherman shows 4inch drop on the brown box. The first picture of the group shot today shows 3 inches from center to center of today's sloppier group.

I posted this other places online and got little feedback, I feel like NASA should know about this... it would be great to see others try HBN lube in polygonal twist barrels... LC brass and CCI450 primers show flattening primers but not horrible.

 

[STS]

Maybe I missed it, but are you implying that the velocity was 4000+ by the amount of drop? If that's not the case, how did you determine the velocity?

 

[Rustytigwire]

A great day only happens when you get out and make it happen. Awesome results!
Congratulations!

 

[5spd]

I'd have to see that speed over a chrony hard to believe 4000 fps out of any 16" bbl

 

[Flouncer]

Not really going to get many comments here either unless there is a chrono.

 

[Rock Knocker]

Yes very hard to believe and yes I was measuring velocity with drop.

I dont use a chrono, drop calculations have gotten me inches away from center at 1200 yards with other rifles and I've done the same here.

53gr TSX .204 BC G1. Hornady online ballistic calc says 4000fps is 5.2 inch drop at 300 with 100yard zero, my zero is just over and inch high and I'm getting 4 inches or less drop at 300....

Too good to be true, I understand but I've been messing with this BHW barrel and HBN for a few months now and it's crazy, 65gr SGK and compressed charge of benchmark... ammo availability has slowed me down but it's very hard to get pressure signs with anything. 50gr Vmax seemed to really get slippery with the HBN but I havent started testing them, I find 50gr vmax to be equal to a frozen pea on MN coyotes so I keep them for plinking and dont want to push them as hard as the TSX.

 

[Rock Knocker]

Not really going to get many comments here either unless there is a chrono.

No doubt but that's why I came back to accurate shooter... send me a chrono or someone else try this out... Polygonal twist barrel and HBN bullets remove chamber pressures so I tried making that pressure up with faster and faster and more and more powder. This charge is hot but the performance is clean off the charts.

 

[Murray Brook]

Does the 16" in your topic mean you have a 16" barrel.

 

[Rock Knocker]

Yes 16" 1-8 Black Hole Weaponry barrel.

 

[STS]

AR 15? How high is the scope above the bore? There's no way that a .223 will send a 53 gr. bullet at 4000+ with a 16 inch (or even a 26 inch) barrel. There simply isn't enough powder capacity to get it there. Most published load data tops out in the 3450 to 3500 fps range with the stiffest loads and that's out of a 24 in or longer barrel. You will loose an average of about 30 fps for every inch of barrel length you remove. 8 inches of less barrel would suggest you would be no more than 3300 tops. You need a good chorograph.

 

[whatsupdoc]

NO way you are mistaken. Like ^ said get a crono.

 

[Rock Knocker]

This is the gun I'm using.

[

Yes a chrono would be great to show people online but I've never needed one and I carry small cardboard boxes across the lake to shoot the 260AI 1200 yards no problem.

This is crazy indeed, please try HBN if you've got a poly twist and prove me wrong or not.

 

[Adam in WI]

This is the gun I'm using.

[

Yes a chrono would be great to show people online but I've never needed one and I carry small cardboard boxes across the lake to shoot the 260AI 1200 yards no problem.

This is crazy indeed, please try HBN if you've got a poly twist and prove me wrong or not.

Where to begin...

I believe it's incumbent on you to provide the proof when you make unbelievable claims. At any rate I'm sure the boss wouldn't appreciate you advocating anyone else attempting to reach those velocities.

Or better yet, call Barnes and ask them what they think of your load.

And do I understand correctly, you're launching high power rifle rounds across a frozen lake?

 

[Just Say Moe]

Are you sure its not a Creedmoor?

 

[Ned Ludd]

You may well end up "blown away". Even using extremely liberal values for case volume and COAL, that load is predicted by QuickLoad to be running in the neighborhood of 80K psi, which is ~25K psi over SAAMI MAX. I don't care what you coated the bullets with, that seems extremely foolish, and I hope no else is foolish enough to copy you. Let us know how the hook and the eye patch work out for you.

 

[karrarararararar]

Something definitely doesn't seem right. 4,000 fbs with a 53 grain bullet is 22-250 speed.

 

[dellet]

I'm blown away.

LC brass, HBN coated 53gr TSX, 26.9gr H322, 1-8 twist BHW 223.

This picture I just shot today, two shots were from 100 yards and three shots from 270 yards. I was using a folded gun case laying in the snow as a rest and accuracy suffered a bit.

by [URL='https://www.flickr.com/photos/160224119@N0l'],
This was my first test beyond 100 yards. I fired 3 shots at 300 yards. My aim point was to rest the horizontal crosshairs on the top of the box, I wasnt concerned with horizontal grouping, i just wanted to measure the drop.
3[/MEDIA]

My 100 yard zero is just over an inch high. My leatherman shows 4inch drop on the brown box. The first picture of the group shot today shows 3 inches from center to center of today's sloppier group.

I posted this other places online and got little feedback, I feel like NASA should know about this... it would be great to see others try HBN lube in polygonal twist barrels... LC brass and CCI450 primers show flattening primers but not horrible.

Hate to be a buzz kill, but when I run those numbers with a 3600 fps MV, 1” high 100 yard zero, I get 3.7” drop at 270 yards and 6.2” at 300.

Your OP states you shot at 270 yards, but later you base your 4000 fps on a 300 yard shot and less than 4” drop. That 30 yards accounts for over 400 fps error. Could probably come closer to your actual numbers by matching conditions, but ....

Interestingly enough 3600 fps is pretty close to what QL predicts for your load, at higher than Proof pressures.

 

[boltfluter]

Not in this lifetime! Yours may not last that long, if you don't get a chronograph!

Paul

 

[chutem]

Apples to oranges here...You need to put your "zero" at 100 yds, not "over an inch high", to compare to the calculator scenario. If your zero was actually at 100 yds, your drop at 300 would be far more than 5.2 inches. Just a math problem here with what bullet speed does at xx yds. speeds drop exponentially as distance increases. Also agree, way to hot of a load...dangerous.

 

[457ciSBC]

Sorry, without proof from adequate measuring tools, this post comes across as just one pushing HBN and poly barrels.

1. 16 inch gas gun, most likely carbine gas length
2. 53 grain monolithic bullet, coated
3. Less than 27 grains of powder
4. 4000+ FPS