It is possible rechambered barrel 250-3000 (Savage 99) to 257 Roberts? It may be dangerous to the gun by the increased pressure to be developed by .257 Roberts? Thanks in advance, Hector

Then 257 is to long for the action magazine ect

I'm sure no 99 expert but didn't they chamber it in 308? Which is longer than the 257R. The Roberts pressure is actually less than the 250-3000 I believe.

The Roberts case is actually about 1/5th of an inch longer than the -08 case but the bullets are smaller and shorter so overall it will work. I have seen a couple done in the clip models but they did not feed well because of the longer case. They don't like to nose up properly and the rounds suffer from tail diving when the shoulder hits the breech face and then the bolt rides over the base and jams everything up. Mags for the 99C are almost non existent now so you don't want to be putzing with them to much anyway.

I have had people tell me that they have made the blind mag E series successful feeders though. The best thing would be to try some 257s in your rifle and see if they will feed first. If they do, then go for it. If not you may want to experiment to see if you can alter a cartridge guide and automatic cut off to work. You can always get those two parts by the bucket full if you bugger one up.

have you considered Improving the 250? If I remember right, the 250 AI was one of the cartridges that showed the highest gains by blowing out the case.

If I remember correctly, there is a difference in the twist between factory .250 Savage barrels and that of factory .257 Roberts, which would preclude using heavier bullets in the Roberts, thus minimizing any advantage gained by rechambering.

quote:

The Roberts case is actually about 1/5th of an inch longer than the -08 case but the bullets are smaller and shorter so overall it will work

Yep the Roberts case is a touch longer. I "thought" the 308 OAL was a touch longer. But I'm functioning without at the moment.

I've found a lot of 99 experts over on 24hr.

7.62X51 parent case for the 308 (2.015")

7X57 Parent case for The Roberts (2.235")

250 Savage (1.912")

quote:

7.62X51 parent case for the 308 (2.015")7X57 Parent case for The Roberts (2.235")250 Savage (1.912")

Louis I understand the 257 case is longer. But, is it the OAL or case length that is the deciding factor? As I said I have very little 99 experience.

At least ammoguide says the 257 reamer would clean up the 250 savage chamber

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Originally posted by Duane Wiebe (CG&R):
If it;s the older "spool magazine" 99, you might have feeding problems with any other ctg . If it IS the older one, you might have a keeper, if you just leave it alone

Yes-
If the gun is in good condition -
please,
leave it as a 250 and use it or sell it and by a .257

Also- altering the rotating magazine to the new 257 shape is a task far more tedious than just a re-chamber

You cannot change a older 99 to a 308 win or similar cartridge. The receiver was changed, I believe they lengthened them, when they started making them in 243, 308, 284 win. If they could be changed, you would not be able to find an original 250S or 300S anymore as everyone would have changed them over.

Thanks Lee. Makes perfect sense. Explains why the couple I saw on the net for sale in 308 and 243 had the same letter.

It's cartridge OVER ALL LENGTH that dictates the issue. I have a 1893 Savage 99 in300 Savage max COAL 2.60" so all you would have to do is seat the bullets to that COAL to function.

COAL for the 257 Roberts is 2.78" max...for the 308 is 2.81" so you wouldn't have any problems in that area in a modern 99.

If you have an early model...or ANY model 250-300 for that matter.... I would leave it alone...it should be worth much more than a cobbled over 257 R mess. Since it's production cessation in 1998 Early model or the modern iterations of the Classic Savage 99 250-300 and just about ALL the other chamberings are turning into high value antiques. I would LOVE to find one in 284, 358, or 375...CHEAP.

If you wan more whack get a bigger gun or have a REPUTABLE smith do a 250 AI chamber as already suggested...you will gain about 100 fs over the 250 and only 100 fs below a 257 R and probably nothing over a COAL shortened 257 R rechamber.

You CAN take a spool model 99 out to 375/284W but the required alterations and milling to the spool should only be undertaken by someone who has extensive experience in doing Savage alterations...but it DOES make a very neat heavy slammer.

quote:

NONAGONAGIN

Thanks everybody for yours answers. I think a very good idea of Nonagonagin to bring the .250-3000 to Ackley Improved version, whenever I get a gunsmith here who can. Best Regards, Hector.

I'm not real sure there might not have to be some modification of the spool to re-chamber to the AI as well. By the way, loaded to same pressures, the AI doesn't perform all that much better than the standard cartridge. Load either cartridge too hot and you will get pretty short case life in a 99 and you have to load hot to see the AI advantage. Regards, Bill.

an option might be to rechamber to the 25-284. Savage made 99's in that case size (284) late in production.

Rich

The 250 Savage is a wonderful cartridge. 257 Roberts is great too. I have killed game with both. The velocity differences are not enough that you would ever notice a difference in the field. A Savage 99 in 250 is a classic and desirable rifle. A rechambered one no so much. Leave the old 99 alone. This is a solution looking for a problem.

Hector...I can't find WHICH model you have...old or new receiver???

Most of the AI versions NEVER really gained much increase in velo over the original case...the 250 was an exception and P.O. just had a silver tongue and NO chrono...

I built a 24" 250 AI for my dad 30-35 years ago because he couldn't handle much recoil. It runs ~3300 fs +/- 25fs with H414/760/RL17 at ~46.6 KPSI according to QL with Nosler 85gr Baltip's which is the heaviest I shoot...and about 3500 fs with Horn 75 V-Max's, 24" bbl...which is basically what the 257 R produces. These are Oehler Chrono checked loads NOT pie in the, sky rose colored glasses, wannabeebadazz, no bullsheet numbers...

The "old" 257 R and the 250-300 were rated at similar SAAMI pressure specs...~51488 psi and 52939 psi. 257 R +P+ is 58000 psi and with a modern receiver higher pressures have been achieved equal to 243 W and 308 W...so let your good sense dictate.

I've been using the same 50 cases for at least 20 years and I've shot a ton of 75's with it and they are still going strong.

Whether or not cases last a long time or not depends on many factors...I built the AI on a 788 action which probably has about the same stretching qualities as a Sav 99 action has, but the sizer die is custom fitted and I use Comp shell holders.

Bill...Your thoughts on the spool got me to wondering so I did some measuring...on a 300 Sav, 22-243 and 250 AI shoulders...all were within ~0.007" of ~0.450 " to each other and I tried both the AI and 22-243 5 cases each in the 300 Sav 99 spool...BOTH loaded all five without a hitch and cycled the same way...and my 99 is the OLD version. My 6mm-284 case measures 0.471" at the shoulder and was a tad to fat to fit but would work in the modern action and make a 25-284 as Rich pointed out...Equal to the 25-06, it is a real screamer with a 28" bbl and probably is just a rechamber also...if the spool is different for the 284 case it is probably available through Numerich Arms/Gun Parts

I can see NO problems with a rechamber and as long as the pressures are kept within the pressure limits of the 99 action, NOT the particular cartridge, and Hector follows benchrest reloading procedures, fits the sizer to the chamber for minimum brass bending...whether or not the 100 fs or so gain is worth the cost is always the tardigrada in the punch bowl.

If you really want to mess up a nice antique, Hector, or if you have a newer model, I would look at doing a 25 Souper or 25-284...you would gain a ton over the 250 AI version and the newer models are readily adaptable because they already come in 243 and 284 case sizes...BUT...I would keep the 250 as is and just buy a new rifle.

I'm pretty sure Savage had different rotors for each chambering so any modification may cause feed problems. Leave it be.