250-3000 Ackley Improved......

[nakneker]

Ballistically? No, there's no discernible advantage for 250 AI over 25 Creed. Less difference after bullet departure than between 243 and 6mm Rem IMO. On the loading bench, the 250 AI has a shorter neck.
-

Thanks Brian. I understand wanting to build what you want, if you’ve always wanted a 250-300AI, I get it, just seems like a 25 creed is the easy button…. Unless your a hater of anything thing creedmoor which I also understand.

 

[Brians356]

Thanks Brian. I understand wanting to build what you want, if you’ve always wanted a 250-300AI, I get it, just seems like a 25 creed is the easy button…. Unless your a hater of anything thing creedmoor which I also understand.

Well, heck, when I had my 250 AI built, there was no "Creedmoor" cartridge even on a drawing board. And there isn't yet any 25 Creedmoor ammo on a price list.
-

 

[Preacher]

The CM brass resizes great to 250ai, ready for fire forming.

Ive shot a bunch of 25 creedmore brass in my 250-3000 AI chamber, fire formed with no problems other than the tight web.. The new JGS reamer will take care of the short neck problem..

JGS has not made my NEW 250-3000 AI reamer yet, it's still in the planning stage... !!!!

 

[SeabeeKen]

That's true, but it's made worse if the chamber is not cut short enough to leave about a 1/10" crush at the neck/shoulder junction when chambering an unfired 250 Savage cartridge. (Thoughtful employment of a 250 Savage "go" gauge can monitor this.) This was Ackley's prescription. The 'smith who chambered my rifle didn't leave this crush fit, so my necks are left even shorter than they should be. I also reverted, after experimentation, to forming 250 AI "bullet-less", "filler-less" from 22-250 cases, using Bullseye and a pistol primer, although I can safely fire factory Savage ammo in the chamber.

It used to be that fresh, unloaded cases were longer than Max Cartridge, and required trimming. "Long" cases would be nice, since you could determine the least case length in a lot, trim all cases to that, but ideally leave all the cases somewhat longer than Max. (I use chamber length gauges to find out just how much extra neck length is safe.)

Unfortunately, most new cases today are trimmed to Max length, or even Trim-To length. Heck, new Nosler 223 cases are shorter than Trim-to length! That's cheating handloaders of useful neck length.
-

This is why I use only Manson AI HS gauges, they are made with the .004" shorter dimension that Ackley wanted.

 

[TSFineGuns]

I have nothing but love for the .250 Savage AI. I inherited one from my FIL. Had to track down some .250 Savage ammo though. That took awhile. Was lucky enough to find a place online that had it in stock. Paid a fortune for it, but I just used it to shoot the rifle and form the AI brass. Now I run it with 43.5gr of IMR4350, a CCI Primer, & a 100gr Nosler Ballistic Tip. Sits right around 3,000fps and shoots great. Very pleasant rifle to shoot.

Factory .250 Savage on the left. Fireformed and reloaded .250AI on the right. Pretty obvious why this is one of the AI cartridges that shows the most gains over the parent cartridge.

 

[Brians356]

The new JGS reamer will take care of the short neck problem..

What's the dimension on that new JGS' straight neck section?
-

 

[nrspence]

What's the dimension on that new JGS' straight neck section?
-

I would like to see that print.

 

[Brians356]

I would like to see that print.

Lacking a print, if someone has a longer-neck JGS 250 AI reamer, just a caliper on the straight neck portion to nearest .001 will do. ???
-

 

[1K6BRA]

Not taking anything away from this great thread, but I think I will just stick with the original 250-3000. I know the AI version is a better design, and I know there’s a little more velocity to be gained. But there’s just something about the original that I think cannot be improved on, nostalgic wise anyway. It has been doing a yeoman’s job for me since my first rifle in 250-3000 in1984, a Remington 700 classic that I still have and use. But this one is my favorite. And yes, it’s still rolls deer like a shotgun rolls rabbits!

 

[Brians356]

It has been doing a yeoman’s job for me since my first rifle in 250-3000 in 1984, a Remington 700 classic that I still have and use. But this one is my favorite.

I've coveted a 700 Classic in 250-3000 for a long time. But they were just just too pricey by the time I became interested.
-

 

[nrspence]

This is the print JGS had. Not sure how that neck size will work with Lapua or peterson brass.

 

[21PHX]

Mine likes a good dose of H414 lit off by a magnum primer.

 

[1K6BRA]

I've coveted a 700 Classic in 250-3000 for a long time. But they were just just too pricey by the time I became interested.
-

I remember well when I bought mine in 1984. A place called Grice gun shop in central Pennsylvania that claims to be the largest gun store in Pennsylvania had bunches of them they could not sell. If I remember right, I think they had them marked down to like $249 or $259!! I bought mine at a local gun shop I’m thinking maybe $299. I entertained thoughts of buying another one, but didn’t and regret it. Between my son and I we have killed approaching 40 deer with that particular rifle. Never lost one. A few have run 50 yards or so. I plan on using it next year for the 40th anniversary from when I got it. I have some leftover Nosler 100 grain solid base slugs ready to go for it that are from that period.

 

[nrspence]

Ive shot a bunch of 25 creedmore brass in my 250-3000 AI chamber, fire formed with no problems other than the tight web.. The new JGS reamer will take care of the short neck problem..

According to Jasmin at JGS there is no “new” 250 AI reamer. The standard reamer they sale is the one I posted up. I wonder if that “new” reamer is someone’s custom reamer they had JGS make.

 

[Preacher]

According to Jasmin at JGS there is no “new” 250 AI reamer. The standard reamer they sale is the one I posted up. I wonder if that “new” reamer is someone’s custom reamer they had JGS make.

The NEW reamer is the one I'm going to have them make for me !!!
Jasmine is the real deal.......

 

[DJD]

The NEW reamer is the one I'm going to have them make for me !!!
Jasmine is the real deal.......

Reviving this. How's the new reamer work with 25cm brass?

 

[SeabeeKen]

It's a 40 degree shoulder.. I have plenty of 6.5 Creedmoor Brass laying around. That's probably what I will end up going with.

I tried this in my 250ai. Did not work for me. 250 savage case has a head diameter of .467 and CM .470 or .471 as I recall. The CM also has a thicker web which protruded into the chamber and as I got near max loads the head swelled just enough to cause clickers and stuck cases. Some guys dont have this issue though.
I've done extensive testing in my 250ai. Here are just a few powders and loads tested in my rifle and as you can see the cartridge is capable of excellent accuracy. Never did find max loads with the hammer bullet.

 

[DJD]

I tried this in my 250ai. Did not work for me. 250 savage case has a head diameter of .467 and CM .470 or .471 as I recall. The CM also has a thicker web which protruded into the chamber and as I got near max loads the head swelled just enough to cause clickers and stuck cases. Some guys dont have this issue though.
I've done extensive testing in my 250ai. Here are just a few powders and loads tested in my rifle and as you can see the cartridge is capable of excellent accuracy. Never did find max loads with the hammer bullet.

Says lapua brass, are you using 22-250 brass then?

 

[SeabeeKen]

Says lapua brass, are you using 22-250 brass then?

Yes, 22-250 brass

 

[DJD]

Yes, 22-250 brass

Have you tried any of the heavies with that brass? I wasn't sure if that'd work with the shorter neck. I'm gonna build a fast twist rifle soon to try a local competition out but mainly for hunting