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Originally Posted By bfk4lyfe:
https://i.imgur.com/qj1Yniu.jpg https://i.imgur.com/db2hw7Q.jpg Slowly working on breaking in my Proof 260 barrel for the AI AT. I shot 40 rounds of various charge weights of Varget and 8208XBR using Speer 90 grain TNTs I had lying around from my 6.5 grendel days just to put some rounds through the pipe. Then I shot 5 groups of 130 ELDMs with RL 16. COAL was 2.805 (not a scientific number, was aiming for 2.800 but landed on that and didn't feel like chasing it). Brass was virgin Starline and primers were CCI 250s. The bottom group is actually my starting charge of 41.8, then the top groups left to right are 42.1 through 43.0 in .3 gr increments. I dialed up half a mil between the top and bottom group, the change in POI wasn't that drastic. No pressure signs at 43.0 grains which chrono'd at 2815 fps, so I'm going to keep going. I would think 2850+ should be easily obtainable with a 130 out of a 24" barrel. The POI is starting to change at 43 too, so hopefully hitting a node as you can see it sort of started to tighten up. The SD also went from 25 at 42.7 to 7.x at 43.0 grains. I'm a newer reloader so if I'm reading this data wrong please let me know. The barrel has 55 rounds through it so I know its going to speed up some. I know three round groups don't count, but gfys View Quote IIRC, it took my Proof about 125 rounds to speed up. I mostly shot the H130s and a variety of Bergers trying to lap the barrel with the bullets and smooth out any tooling. I was tracking velocities along the way and I could see when the velocities increased. Once that occurred, I loaded up some rounds with three differing powders to find the velocity node. Once I found the node, I loaded to the grain for the powder and tweaked the jump to the lands using BTO. I kept track of the results and put the data into a scatter chart. I posted these before, but here they are again. Your mileage may vary and remember, don't jam the bullets into the lands, the pressure spike is about 6,000psi: And here's a sample of the jump testing and how a few thousandths cam make a huge difference, and I also only shoot 3-round grounds for testing. |
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Okay, welcome to being anal. Here's a dropbox link for the Excel Workbook with individual sheets for the differing scatter charts. It's titled Master and you should save that file as is. Once you do, open the file and rename it to whatever you like for your testing and data and save it with that new name. That way you have a working file for your data and if you screw that up, you still have the original master file as a fall back. Hit the link and then "Open," which shows a drop down with a "download" button. Please let me know if you can't download and edit this file.
If you don't know Excel, it's really not hard at all. You don't do anything to the chart, it self populates based off the data you enter on the left. All you need to worry about is cell B1 with the name of the powder and bullet, which can be highlighted and changed in the cell, or two rows above where the name also appears. You do the same with cells A2 through A15, just rename them to the charge weight you used, and the LR is a reference to which LabRadar file the velocity data resides. Just rinse and repeat for velocity data in cells B2 - B13. Use the chart to analyze velocities and determine your velocity node. Dropbox Link Remember to tweak the jump to the lands so you combine the node charge with the optimal jump (BTO, not COAL). |
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Wow thanks, that’s a lot of data. I was going to try to shoot 200 rounds through it before I got too serious in the load development to allow the barrel to speed up, plus that way I’ll have 200 pieces of fire formed brass that will be optimal for the rifle. So for now I’m not taking my initial results too serious.
I need to order the Hornady tool and modified case still so I can check those seating depths, there’s always something else.. “padom” on snipershide has good posts out lining his process of his load development that incorporates, I believe, OCW and then seating depth changes. It’s interesting seeing what a difference little changes make. |
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Originally Posted By bfk4lyfe:
Wow thanks, that’s a lot of data. I was going to try to shoot 200 rounds through it before I got too serious in the load development to allow the barrel to speed up, plus that way I’ll have 200 pieces of fire formed brass that will be optimal for the rifle. So for now I’m not taking my initial results too serious. I need to order the Hornady tool and modified case still so I can check those seating depths, there’s always something else.. “padom” on snipershide has good posts out lining his process of his load development that incorporates, I believe, OCW and then seating depth changes. It’s interesting seeing what a difference little changes make. View Quote |
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Originally Posted By Defender3: I posted these before, but here they are again. Your mileage may vary and remember, don't jam the bullets into the lands, the pressure spike is about 6,000psi: View Quote On AINA 26" barrel speed- I checked old data from my 24" MRAD barrel and the new AINA 26" is approximately 15fps faster than a broken in 24" rock creek with Prime 130gr. With heavy bullets, the gap starts to widen. 147gr ELD reloads are showing a 45-55FPS jump with the extra 2" which may increase as the barrel is broken in. |
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Originally Posted By nihilsum: Really useful data there. Without looking back in the thread, assuming these are gas rifle loads? I ended up almost a grain higher on each but have only loaded long for bolt rifles. On AINA 26" barrel speed- I checked old data from my 24" MRAD barrel and the new AINA 26" is approximately 15fps faster than a broken in 24" rock creek with Prime 130gr. With heavy bullets, the gap starts to widen. 147gr ELD reloads are showing a 45-55FPS jump with the extra 2" which may increase as the barrel is broken in. View Quote My 26" AI WinTac barrel is just slow, just some bad luck in the draw. With a longer barrel, you might try 4831SC as it's a slower powder that might be easier to find. |
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Originally Posted By Defender3: Those are bolt gun loads for my AI with the 24" Proof barrel. My 26" AI WinTac barrel is just slow, just some bad luck in the draw. With a longer barrel, you might try 4831SC as it's a slower powder that might be easier to find. View Quote |
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Originally Posted By mettee: I wonder if it would ever mature, you know, with some more rounds. View Quote I just received a Dave Tooly 24" AI barrel I'm going to try and I'm sending my Krieger 5R 264 Palma blank to Robert Gradous to be finished at 26." That gives me Krieger, Bartlein and Proof barrels to shoot. I should probably just shoot what I have, but heck, it's science. |
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Hey I'm entertained
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Anyone have any factory Hornady 130 loaded rounds around? Looking for the COAL and OAL please.
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Thanks all
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A quick observation on the Tooley barrel - factory FGMM and H130s drop right in the chamber, the Bergers with the Lapua brass do not go all the way and the once fired does not. I need to clean the barrel and chamber and try again, but this could be a bit tight at the base.
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Originally Posted By Defender3:
A quick observation on the Tooley barrel - factory FGMM and H130s drop righ tint he chamber, the Bergers with the Lapua brass do not go all the way and the once fired does not. I need to clean the barrel and chamber and try again, but this could be a bit tight at the base. View Quote |
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Originally Posted By Defender3:
A quick observation on the Tooley barrel - factory FGMM and H130s drop righ tint he chamber, the Bergers with the Lapua brass do not go all the way and the once fired does not. I need to clean the barrel and chamber and try again, but this could be a bit tight at the base. View Quote |
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Who helps the helpers?
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Originally Posted By AR167: Had same thing on my LH gain twist bartlein for my AXMC. I got it from Mile High. They took care of it though. I specified SAAMI Spec..... Shoots light out now. View Quote |
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I have not followed the rest of it in this thread, but I agree that the barrel was more than test fired.
The pitting is interesting. I have scoped a number of barrels that were pitted (not just old milsurp guns). Probably comes from not oiling the bore after firing and storing it in a humid environment. Not as common to see it in a stainless barrel but happens pretty easy/fast in a carbon bore. I have stainless barrels with thousands of rounds, mostly without cleaning, and they have not developed pits. They are stored at 40% RH, which may help. The most pitted modern firearm I have looked at was a new, in box Springfield M1A. |
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Originally Posted By nihilsum:
I have not followed the rest of it in this thread, but I agree that the barrel was more than test fired. The pitting is interesting. I have scoped a number of barrels that were pitted (not just old milsurp guns). Probably comes from not oiling the bore after firing and storing it in a humid environment. Not as common to see it in a stainless barrel but happens pretty easy/fast in a carbon bore. I have stainless barrels with thousands of rounds, mostly without cleaning, and they have not developed pits. They are stored at 40% RH, which may help. The most pitted modern firearm I have looked at was a new, in box Springfield M1A. View Quote |
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Originally Posted By bfk4lyfe:
https://i.imgur.com/fPCfjwA.jpg Been busy today. On dad duty, wife left for business trip today. Too bad about your barrel. That’s why I like to only buy stuff new from the dealer. I may or may not have bought a 6mm... View Quote I thought 6mm was .243, oh wait, that's what Ok Boomers call the new flavor of the day. |
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Originally Posted By Defender3: I know you're in Cali, but it looks like you're behind on cooking up that pork. I thought 6mm was .243, oh wait, that's what Ok Boomers call the new flavor of the day. View Quote Not wrong about flavor of the day, but my 260s are all squared away for the most part, need a new project. |
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Barrel comments? It's a real pity.
Yes weather is great. Spent the morning wearing shorts shooting. No bolt actions though Only used a Larue for a photo. |
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Originally Posted By Defender3:
You guys are slow today - not one comment on the barrel - must be nice weather outside. I did a quick test of the Tactacam Long Range Shooter package today and it worked well. I hope it not only captures the impacts, but also where the reticle is when I break the shot so I can refine my technique. I installed it on the AI with the NF ATACR using the #7 collar and hanging the camera on the right side of the rifle. I moved to scope up two positions on the rail for eye relief then took it outside and targeted a house 115 yards away, then shot the video. I could not see the video as it was recorded as I didn't enable the WiFi so you can see the camera was canted. I need to maybe move the camera to the left side of the rifle and figure out how to level the camera to the scope. The video is captured at 4K so I edited it down to 10 seconds. I was on the rear deck with no rear bag so it's shaky but I think you get the idea. https://www.AR15.Com/media/mediaFiles/52736/IMG_3387-1260474.jpg https://www.AR15.Com/media/mediaFiles/52736/IMG_3388-1260473.jpg https://www.youtube.com/watch?v=TlTl7vFxYHc View Quote |
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Without blood, it doesn't count!
"A gun, like any other source of power, is a force for good or evil, being neither in itself, but dependent upon those who possess it." |
Hopefully the guy who sold you that barrel can get his money back. How many rounds did that look like to you?
I'm itching to get the 260 up. Soon, very soon. |
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Back to 260 stuff for the tOBR, if anyone still shoots theirs. Almost out of factory ammo so time to load. Going to use Berger 130 hybrid ar’s. I know the happy place for RL16 is 42.9, what’s the equivalent for h4350?
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Originally Posted By bfk4lyfe: https://i.imgur.com/DUVNz3Q.jpg What time do you wake up jeeze. Turned out ok, was tender but a little bland, I didn’t inject it like i normally do, guess it makes a big difference. View Quote Nice looking pork, I'm salivating it looks so good! |
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Originally Posted By bfk4lyfe:
Back to 260 stuff for the tOBR, if anyone still shoots theirs. Almost out of factory ammo so time to load. Going to use Berger 130 hybrid ar’s. I know the happy place for RL16 is 42.9, what’s the equivalent for h4350? View Quote As for a 130gr bullet, I'd try 41.8 or 42grs. |
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Originally Posted By bfk4lyfe: https://i.imgur.com/DUVNz3Q.jpg What time do you wake up jeeze. Turned out ok, was tender but a little bland, I didn’t inject it like i normally do, guess it makes a big difference. View Quote |
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Spent some time at 1000 today at Quantico. Started at 27 degrees and a -2200 Density Altitude, and then warmed up to 50 degrees so we actually had mirage. I was basically playing with the Tactacam to see if I liked it. Here are a few videos. I had to edit them as the camera records in 4K so the files were huge. I'm shooting at a 2/3rds IPSC steel at 1000 and a clay at 1035 with the AI in 260. I have to apologize as the camera moved in the mount so some appear not to be level; the scope and reticle were level for the shots.
You also do NOT see the same field of view as you are seeing in the video. The ATACR was set at 35x so the field of view was about 1/2 of what you see in the vids. I could increase the FOV but I had to get so close to the scope I got a recoil bump. Quantico 1000Y 2 Quantico 1035Y Clay |
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Nice videos. Really amplifies how much the rifle moves.
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