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SWABBY56
Advanced Member



USA
878 Posts

Posted - Dec 17 2013 :  22:30:33  Show Profile Send SWABBY56 a Private Message  Reply with Quote
Anybody have some good loads for the 257 Roberts ackley Improved?

Shastaboat
Advanced Member



USA
9125 Posts

Posted - Dec 18 2013 :  13:13:36  Show Profile Send Shastaboat a Private Message  Reply with Quote
Mark, I've been doing a lot with a standard .257 chamber deep throated. I'm getting velocities = to an AI chamber. What bullets are you loading? I've done a bunch of load development with 75 gr, 100 gr and some with 115-117 gr. Now working with 85 gr. The best powders I've found:
75 gr...4895, 46 gr of 4895 at 3487 fps
100 gr...4350, 48 gr of 4895 at 3262 fps
115-117 gr, 46 gr of H100V at 2919 fps (still working on this weight) but I suspect 4831 will also be good except it is bulkier.
None of these MAX loads should be used in a standard throated .257 Roberts, but should be safe in an AI chamber.

Also when I deepened the throat of my standard chamber I though I might loose accuracy with the 75 gr bullets but accuracy didn't suffer at all even though I'm probably .200" off the lands with this weight bullet. Just gave me more powder capacity and pressure control.

85 gr 4895 but I'm still working on this weight bullet. So far I've gotten 3250 fps using formed cases, 44 gr of 4895 before throating and I am currently working up from there in commercial cases...when it gets a bit warmer outside. I'm sure I'll be able to get 3300+ fps and maybe even 3400 fps.

The .257 Roberts is a great cartridge and in AI also. If I had An AI chamber I would certainly deep throat it to .300".

I did do some chronographing for a buddies .257 Robts AI a few years ago. The results:
75 gr at 3721 fps, 48 gr of 4895 with formed cases. We backed this down to 47 gr of 4395 at 3470 fps
100 gr at 3275 with 50 gr of 4350
I suspect H100V will be a great powder for 100 to 117 gr bullets. Sure meters better than 4831 LC. 4831 SC should also be good.

To get the full potential of a .257 Robts AI or Deep throated you must be using a long action to seat the bullets long.

Edited by - Shastaboat on Dec 18 2013 13:25:32
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southdakbearfan
Senior Member



USA
367 Posts

Posted - Dec 18 2013 :  23:37:20  Show Profile Send southdakbearfan a Private Message  Reply with Quote
Agree totally with Shasta on the deep throat and long action.

I have an M77 tang safety ruger rebarreled to 257 AI and my father has another custom built on a German mauser action.

My best velocities and accuracy have come with H4831SC pushing 100 gr Nosler Ballistic Tips, WLR Primers and Rem Brass. Excellent Whitetail, Mule Deer and Antelope medicine. With the Lee PPM I have found the SC to meter very well. Right above 3200 fps was the honey spot for this rifle with the 100's even though I could get up to 3300 when I worked my way up the accuracy wasn't quite as good.

I have been thinking about trying some H100V but I use H4831SC in my 270 and 300 win mag at the current time and have a couple 8 lb kegs of it so I haven't ventured out on it.

Lots of people like to complain about the ballistic tips and I have shot numerous other bullets through it in the past, from Barnes to Speer to Hornady's to Sierra's to Nosler Partitions, but found the overall performance of the Ballistic Tips to be the perfect medicine in this rifle. I always seem to get nice exits and not a lot of blowup on the bullets and this has been from up close and personal, 50 yds out to 400 yds+.

Every rifle is different so work your way up and try different things (powder/bullets/etc).

Edited by - southdakbearfan on Dec 18 2013 23:43:38
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Shastaboat
Advanced Member



USA
9125 Posts

Posted - Dec 19 2013 :  12:24:28  Show Profile Send Shastaboat a Private Message  Reply with Quote
southdakbearfan, would sure like to hear more about your and your Dad's load development. As you can see my 100 gr load is at 3275 fps.

My rifle is also a Ruger 77 tang with a 6x24 Mil dot BSA scope.

Edited by - Shastaboat on Dec 19 2013 12:25:40
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southdakbearfan
Senior Member



USA
367 Posts

Posted - Dec 20 2013 :  00:08:37  Show Profile Send southdakbearfan a Private Message  Reply with Quote
Well Shasta, as with all rifles, the two are totally different in velocities and pressures they develop.

His has a 26" Shaw barrel on it and mine has a Douglas 24" on it now. His will eat about 1.5 more grains of H4831SC than mine will before developing any pressure signs. If I remember correctly the fastest we ever got 100's going was a tad past 3400 but I believe they were Sierra's, possibly pro hunters, flat based. Never got as fast with the noslers but had better accuracy and performance.

My chamber is a tad tighter (which can explain some of the velocity/pressure difference). We learned that one right away as we mixed up the brass once and couldn't neck size.

Same loads they run about 75 to 100 fps different, which can be attributed to barrel length and just different barrels altogether.

Last year I put a Sightron SII 4-16 x 42 on it and love it to death. I had an S1 3-9 x 40 on it and it was good, just wanted a little more magnification on it.

Typically I will run about 53.5 to 54.5 grs and he can push close to 55 to 56 in his if my memory is correct, with H4831SC, makes the case really full and compressed depending on the bullet.

I put a timney trigger in mine a while back as well and ditched the factory rings as the previous owner had stretched one that I had shimmed for a long time. I went with Millets ruger replacements and really like those as well. Glass beaded the entire thing after I had a Black Walnut stock made for it.

Edited by - southdakbearfan on Dec 20 2013 00:10:16
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Shastaboat
Advanced Member



USA
9125 Posts

Posted - Dec 20 2013 :  12:23:30  Show Profile Send Shastaboat a Private Message  Reply with Quote
Both of you guys are named Mark. Anyway southdakbearfan...what throat lengths do both you and your dad's rifles have? What kind of velocity do you get with 75 gr bullets. Do you use the rifles for prairie dogs? 3400 fps with the 100 gr is pretty fast. Years ago I built a 6mm Rem on a highly modified Pattern 1917 action with a Shaw barrel and used it on rockchucks in Idaho. I sold it and wish I had it back. I've become quite a fan of rifles based on the 7x57 case. I would bet that the H100V would be a good powder for the .257AI and also loads easy because of being a ball powder.

I installed a Jard sear on mine. Also a lighter trigger spring. It's better than factory but still has a bit of overtravel to keep it safe.
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southdakbearfan
Senior Member



USA
367 Posts

Posted - Dec 26 2013 :  17:27:42  Show Profile Send southdakbearfan a Private Message  Reply with Quote
I will have to go and look as I have it written down somewhere. I know with the 100 gr ballistic tips the COAL is 3.025 which is about .015 off the lands.

I have shot a bit a PD's with mine, but I have 3 222's that typically take up most of that shooting, along with the 22, 17 and 22-250.

I also shot the 75 gr Hornady HP's but could never get them to shoot under an inch. Both rifles seem to like the 100's and 120's well that we have shot.

The 3400 fps was fast, but it just wouldn't group consistently.

Brass was a big issue for a while as we got into a particular lot of Remington brass that wasn't worth a crap. The new stuff I have from Remington is a lot better. We had some issues with splitting with that one lot during fireforming, but that's the only time it has happened and we really only need to do that every few years as we dwindle down the cases mostly due to being lost in the field. One thing having to fireform cures you of is leaving your brass lay in the field.
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SWABBY56
Advanced Member



USA
878 Posts

Posted - Jan 03 2014 :  21:44:51  Show Profile Send SWABBY56 a Private Message  Reply with Quote
It is a custom 257 AI. 26 inch barrel and rem 700 action. Was offered to me at a great price and I could not pass it up. Made by a guy that works at ER Shaw. Forster dies, brass, and an unfired weapon for $600. Like I said, I could not pass it up.n Will probably be shooting a 115 grain Nosler or similar out of it.
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southdakbearfan
Senior Member



USA
367 Posts

Posted - Jan 03 2014 :  22:26:24  Show Profile Send southdakbearfan a Private Message  Reply with Quote
Sounds like you got a decent deal there Swabby.

The 115 is one bullet neither of the 257 AI's I have experience with really liked, but they did like 120's and 100's.

Good luck and keep us posted.
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SWABBY56
Advanced Member



USA
878 Posts

Posted - Jan 03 2014 :  23:07:16  Show Profile Send SWABBY56 a Private Message  Reply with Quote
A box of bullets that the guy gave me were some factory Nosler 120's. Suppose to be good.
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palmer22250
New Member

USA
34 Posts

Posted - Feb 19 2014 :  01:29:13  Show Profile Send palmer22250 a Private Message  Reply with Quote
My model 70 257 Roberts Standard really likes Norma MRP and
RL22 with 110 gr bullets and heavier. The 115 gr Nosler
Partitions shoot good in my rifle. The Barnes reloading manuel
and Quickload have some good 257 Roberts loads.
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Shastaboat
Advanced Member



USA
9125 Posts

Posted - Feb 19 2014 :  12:12:40  Show Profile Send Shastaboat a Private Message  Reply with Quote
I've got some range testing to do on 87 and 115 gr's loaded and will let you all know how they shoot in my deep throated standard chamber when the weather warms up a bit.
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Shastaboat
Advanced Member



USA
9125 Posts

Posted - Jun 16 2017 :  21:38:52  Show Profile Send Shastaboat a Private Message  Reply with Quote
Since picking up my 2nd Ruger 77 tang in.257 Rboerts a month ago, I've deep throated it to .300" and have been doing some load development with some 120 gr Rem CorLocs. Today I fired 46 gr pf H100V at 2917 fps and 2856 fps with 47 gr of Data 85. My next test will be with 1 grain more of each powder. No signs of high pressure with either load and decent groups of 1.5". This rifle has a 2x7 Redfield and I'm sure with more magnification I can shoot better groups. I will probably take out the other Ruger 77 .257 with the 6x24 BSA scope next time, probably tomorrow am. I still haven't tried 4831SC since my supply has been depleted and I think I'm leaning to the Data 85 powder to use since I'm still working with an 8# keg.
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Zero333
Advanced Member



Canada
812 Posts

Posted - Jun 17 2017 :  00:52:34  Show Profile Send Zero333 a Private Message  Reply with Quote
Wish I could get surplus powders in Canada.

Treat that trigger like it’s your first date, not like you’ve been married to it for 20 years.
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Shastaboat
Advanced Member



USA
9125 Posts

Posted - Jun 17 2017 :  18:15:29  Show Profile Send Shastaboat a Private Message  Reply with Quote
Well my range testing on one more grain of powder didn't increase velocity at all. Guess I'm gonna have to try some 4831SC and see if I can get close to 3000 fps with the 120 Rem CL bullet. So far 46 gr of H100V is giving me 2917 fps and 1/2" groups at 100 yards. 47 gr gave me the same velocity.
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budlight
Advanced Member



USA
1659 Posts

Posted - Jun 20 2017 :  12:51:42  Show Profile Send budlight a Private Message  Reply with Quote
The best powder for 26 inch 257 R AI 120 gr is Superformance at 50.5 grains. Reloader 26 is another fine option 53.4

Both using standard CCI large rifle primers. No flattened primer or stress to the cases. I use 7mm Mauser cases becase that is all that was available at the time. chrono using the same charge fire forming or the fire formed all exceed 3000 fps without case stress.

The only other round I shoot is 87 grain V-max using 46.4 grains of Ram Shot Hunter. You do your own chrono data because you can't believe the FPS I'm getting

I experimented with 75 HP and h100V and dialed in 3560 fps.

Edited by - budlight on Jun 20 2017 18:11:46
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