Fast14riot
Gold $$ Contributor
I shoot the 153.5 at 2810 which is my low node. Can run them over 2900 but no need to.
260AI roll call
- Thread starter Fast14riot
- Start date
I presume you'd need a LA to run them out of a magazine?
Fast14riot
Gold $$ Contributor
Yes. I seat them to 3.109" COAL
I've fire formed 60 rounds playing with just seating depths with 42gr of H4350. So far 20 off with 142 SMK Has been my best load. It's shooting 1.1-1.3" groups at 300yds. I have a range here at my house. I have not shot any of my Berger 140 or 144 Hybirds yet I was actually waiting till I get my brass formed because I have a good supply of the MK's. BTW I hate new brass with no carbon in the necks and neck tension being inconsistent so I'm thinking with some fired brass I'm going to like it! Thx for checking in with me!
Fast14riot
Gold $$ Contributor
That sounds about right, shooting 0.3-0.4 moa fire forming is pretty standard for the 260AI! Sounds like you're well on your way. Any of those 3 bullets running 2950-2975fps will likely be your best load. Somewhere right around 45gr of H4350. What brass are you using?
I like to keep the information fairly fresh and constant in this thread as many people seem to come through and check on it. At my club there are several of us shooting 260AI for F/open long range and many of them have told me about bits they've read in this thread.
Lapua 260 Brass. Brother I've read till my eyes have about crossed on everything I can dig up on the 260AI. I've seen several use 308 Palma brass but what I decided to do is see how 100pcs of the parent case worked and then decide if I need to go to the Palma Small rifle primer route? I'm cool with 2925-2950 with a 140-144 if this Brass will get me there with the accuracy I want? Also my firing pin has been bushed and turned down so SRP is not a issue for me! You tell me?
Should be fairly easy to get those speeds out of either one of those bullets with H-4350.
Mike, I fair really well with the Peterson SRP brass with mine. Not much difference in load data for the swap from LRP to SRP brass.
Thanks Bill. I've not shot any H4831 in the FF loads. I know it's a little slower but this gun has a 28"'barrel so it may also be the ticket. I'm not one to get wrapped up,in speed because all I care about is small groups at the distance I'm shooting! YES I would love 2950-2980 with my accuracy but I will shoot it at the speed it likes. Now I'm not shooting it 2800 LOL
Fast14riot
Gold $$ Contributor
I also use Peterson 260srp brass and dropped a couple tenths when I switched from Lapua because of case capacity. I'm currently on 10-11 firings of the same batch and primer pockets are just ever so slightly looser, but still good.
Regarding velocity, the range I quoted is where most of us end up with 26"+ barrels and not beating the brass really hard. Since I switched to the 153.5 Berger for F/open, I decided to run the low node and use the ridiculous BC of the bullet just because I can. I run them at 2810fps from a 30" Kreiger. The 140s running fast shoot very well. Dial in about 28moa and go to 1K no problem!
These velocities are where best accuracy was found, not tuning for the velocity.
Regarding velocity, the range I quoted is where most of us end up with 26"+ barrels and not beating the brass really hard. Since I switched to the 153.5 Berger for F/open, I decided to run the low node and use the ridiculous BC of the bullet just because I can. I run them at 2810fps from a 30" Kreiger. The 140s running fast shoot very well. Dial in about 28moa and go to 1K no problem!
These velocities are where best accuracy was found, not tuning for the velocity.
H-4831 is a winner with the 140 -144 gr class bullets as well as H-4350. 47.5 gr. with a CCI 450 primer gives me @ 2948 fps with a 26 inch barrel. 5 shots @ 100 yds. normally with give me .250 inch groups consistently.
EDIT: Last time out at 700 yds. and shooting at a 600 yd. target I was able to clean it with 10 shots and 5 in the X ring.
Thanks. After you and Bill both saying the Peterson SRP brass shoot as good or better than anything. I'm going to just go ahead and grab a box and FF them so I will have both to choose from. I'm retired but help a Custom rifle builder so I'm not worried about FFing extra shots on my barrel so I'm getting me some Peterson ordered tonight. You guys have gave me solid info to work with with the 260ai this is my first one and I already like how it shoots forming brass! I feel like after its annealed and I get to actually set my neck tension it going to do well!
Glad to be able to help. I believe you will be well pleased with the 260AI. It has all the right stuff to make a rifle shoot fantastic. I would not want to be without mine when getting out to shoot long range.
Fast14riot
Gold $$ Contributor
Haven't seen a range report yet, get that gun going?
Same here, got your new rig back and shooting yet?
The 260AI is habit-forming no doubt. The 30BR and 6PPC are both fun but when it comes to stretching it out its hard to beat it with the 140 gr. class bullets.
SVT_Tactical
Gold $$ Contributor
Yes and no. It's @Bill Norris old barrel so I know what it'll do. We tossed in a magpul hunter stock but it's not a good for for riding bags or trying to get great accuracy. We put a few .3" groups up at 100 and a 5" 700yd group but with the limitations of the stock I decided to wait for a better ride before wasting more components. It'll be going soon enough. I have so many projects that Bills had is spinning with mine
Cant wait to see it in that new stock and up and running . Always happy to lend a hand anytime.
nakneker
Gold $$ Contributor
Zack sent my 260AI off to get cerakoted on Tuesday. I should have it in hand in 2-3 weeks. I just read through the thread, there’s a ton of info here and it is appreciated. Thanks for starting the thread to the OP and all who contributed.
This rifle will be hunting rifle. Built on an AntiX, CF proof 22” to help with overall length and the thunderbeast. McMillan stock…. I’ll post a pic when it arrives. I’ll be jumping on load development, I hope to use this rifle a lot this fall between me and my wife, we both have New Mexico and Arizona Couses deer tags, the Arizona hunt is in the rut and it’s during the holidays so we should get to hunt most of the two weeks.
I’ll be exploring 140 accubonds and maybe 153.5 Bergers. It’ll be fun. My first 260AI and my first CF Proof. Thanks again for all the data!
This rifle will be hunting rifle. Built on an AntiX, CF proof 22” to help with overall length and the thunderbeast. McMillan stock…. I’ll post a pic when it arrives. I’ll be jumping on load development, I hope to use this rifle a lot this fall between me and my wife, we both have New Mexico and Arizona Couses deer tags, the Arizona hunt is in the rut and it’s during the holidays so we should get to hunt most of the two weeks.
I’ll be exploring 140 accubonds and maybe 153.5 Bergers. It’ll be fun. My first 260AI and my first CF Proof. Thanks again for all the data!
Fast14riot
Gold $$ Contributor
What unit did you get in AZ? Congrats on the new rig, can't wait to see pics! You'll love the round.
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