New 260AI! Load data needed

[ltsheets]

Hey everyone. Thanks for all of you who posted advice in my lightweight rifle thread. Now that I've picked up a rem700 TI in 260AI https://www.24hourcampfire.com/ubbth...y#Post12110025 I need some advice on where to start with load data. I have a box of 143eldx at home already and plan on also trying a variety of berger VLD along with accubond and barnes LRX. Any experience you guys have with any of these would be appreciated. Thanks!

[kcmarullo]

If you are shooting the Bergers get yourself a Berger book and go by what they say on load data. I don't have any 260 AI experience.

[Cajun Blake]

buy 100 rds of Lapua brass and don't look back

perhaps look into a Hornady hydro-forming die to form the AI brass shoulder

start with 260 Rem load data and work up slowly in .2 - .3 gr increments


follow Terry's advice ... http://www.6mmbr.com/gunweek046.html

another link: http://www.the-long-family.com/260AI.htm

[ltsheets]

100 new pieces of lapua are coming with the rifle .

buy 100 rds of Lapua brass and don't look back

perhaps look into a Hornady hydro-forming die to form the AI brass shoulder

start with 260 Rem load data and work up slowly in .2 - .3 gr increments


follow Terry's advice ... http://www.6mmbr.com/gunweek046.html

another link: http://www.the-long-family.com/260AI.htm

[bbqfan5909]

Got a 260rem and about to start shooting eldx 143s, using H4350 powder seems the best for this caliber.

[stxhunter]

I've got a 260 ai with a 24" barrel that APR built me.

I started with H4831sc and got good groups but velocity was lacking.
2935 with 129 SST and 2790 with the 143 eldx was about as good as I could do with a full case

Next powder I tried was IMR 4451 but ran into pressure before getting to 2800 with the 143 eldx.

I recently tried some H4350 and am getting 2869 with the 143eldx and close to 3000 with the 129 sst.

Currently loaded for testing I've got 140 HVLD with H4350 and RL26. Haven't heard much about RL26, but quick load suggested I might be able to get a little more velocity.

After this round of testing I may be switching to the 135 classic hunters. Looks like I might be able get the velocity I'm wanting and they're supposed to be a little easier to "tune".

[ltsheets]

Keep us posted stx.

[stxhunter]

Will do.

For what it's worth QL suggests the following powders get the best velocities:

RL 26
Norma MRP
RL 17
IMR 7828 SSC
RL 16


I'd be curious to see how RL 16 does as well.

[bboswell]

buy 100 rds of Lapua brass and don't look back



perhaps look into a Hornady hydro-forming die to form the AI brass shoulder



start with 260 Rem load data and work up slowly in .2 - .3 gr increments





follow Terry's advice ... http://www.6mmbr.com/gunweek046.html



another link: http://www.the-long-family.com/260AI.htm

I second the Hornady hydro-form die, on Blake's advice I went that route for my 280AI and couldn't be more pleased with the results.

[ltsheets]

I just read that hydro forming gets it about 95% formed until u fire it to sharpen the shoulder corners. When u did this for your 280ai, did you have to tweak your loads from first fired to second or did the accuracy remain?

I second the Hornady hydro-form die, on Blake's advice I went that route for my 280AI and couldn't be more pleased with the results.

[bboswell]

I just read that hydro forming gets it about 95% formed until u fire it to sharpen the shoulder corners. When u did this for your 280ai, did you have to tweak your loads from first fired to second or did the accuracy remain?

1,3&5 are Hydro-formed while 2&4 have several firings. Yes firing sharpened the shoulder but I noticed no difference during load development. I have not compared Hydro-formed vs fire formed in a final accuracy load though.

[stxhunter]

Just wanted to update with the info from today. Had a SHORT range session, ran in to pressure before the end of testing and stopped.

RL 26 defintely has some promise, managed about a 1/2 moa 4 shot group. There was some presure and I think the next lower charge will shoot a tad better (pulled one shot, but two went into one hole). The best part is I'm getting the velocity I was looking for. The 1/2 moa group had an average of 2949 with the 140 HVLDs, but like previously mentioned I'll probably back that down to around 2927.

[stxhunter]

New 260AI! Load data needed

Slight pressure






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[bboswell]

Slight pressure






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Stiff bolt lift? I'm not seeing excess pressure in that pic.

[Mike D]

Stiff bolt lift? I'm not seeing excess pressure in that pic.

Me either.


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