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#7275172 - 01/06/13 Favorite 257 Roberts Powders
OSU_Sig Offline
Campfire Ranger

Registered: 05/27/11
Posts: 2224
Loc: Oklahoma
What powders do you find best for accuracy? No bullets heavier than the 117 and likely will focus on 87-100 grainers.
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#7275315 - 01/06/13 Re: Favorite 257 Roberts Powders [Re: OSU_Sig]
Mule Deer Online   content
Campfire Oracle

Registered: 07/24/01
Posts: 36958
Loc: Banana Belt, Montana
H-4350, for all those bullet weights.

IMR4350 will work just as well, and may even shoot a little more accurately with some bullets, but H4350 works through a powder measure quite well and is less temperature-sensitive.

Other powders work very well in the .257, especially Ramshot Big Game and Hunter (and even Magnum, with 115-120 grain bullets). But H4350 is always the first one on the list.
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John

"Gunwriters, as you know, aren't as informed as their readers are and if it wasn't for the readers, there would be no need for writers..."--Shrapnel, May 2015

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#7275485 - 01/06/13 Re: Favorite 257 Roberts Powders [Re: Mule Deer]
mart Online   content
Campfire Ranger

Registered: 03/05/03
Posts: 2353
Loc: Wasilla, Alaska
I've had two of them and still have one of them. Either H4350 or IMR 4350 is what I've always used in mine. With my first one I had a lot of IMR 4350 on hand and used that with good results. I seem to always have a fair amount of H4350 on hand now and use that. Same good results.

Mart
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"a large number of red blooded Americans have been striving to make us a Nation of Rifleman. We have succeeded. May we ever remain thus, for the privilege to bear, and the ability to use weapons is the greatest guarantee of Liberty." Townsend Whelen

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#7275509 - 01/06/13 Re: Favorite 257 Roberts Powders [Re: mart]
mudhen Offline
Campfire Outfitter

Registered: 05/30/05
Posts: 9970
Loc: Boot Heel of New Mexico
The two 4350s are pretty much all that I use, as well.
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Young at heart, slightly older in most other places...

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#7275729 - 01/06/13 Re: Favorite 257 Roberts Powders [Re: OSU_Sig]
MT_DD_FAN Online   content
Campfire Regular

Registered: 12/30/06
Posts: 771
Loc: Montana
Originally Posted By: OSU_Sig
What powders do you find best for accuracy? ... likely will focus on 87-100 grainers.


After 40+ years of loading 'da Bob', if forced to pick just one powder for this range of bullet weights, it would have to be H4350, although I burned lots of IMR4350 before the H-version became available, and it worked very well.

However, especially for bullet weights <=100 grains, I've also used plenty of 4895 (H & IMR) and IMR4064 in this cartridge, and those powders have produced very good accuracy with velocities within 100 fps of that produced by the 4350s. Varget is another powder that I've used in similar cartridges, and I suspect it would produce excellent accuracy and acceptable velocities in the 257 Roberts.
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Pursuit may be, it seems to me, perfect without possession.
Robert Kelley Weeks (1840-1876)

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#7275825 - 01/06/13 Re: Favorite 257 Roberts Powders [Re: OSU_Sig]
StarchedCover Offline
Campfire Regular

Registered: 06/05/10
Posts: 625
Loc: Michigan
Another vote for H4350.
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Currently in the land of trolls, missing Da UP.

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#7277562 - 01/07/13 Re: Favorite 257 Roberts Powders [Re: StarchedCover]
OSU_Sig Offline
Campfire Ranger

Registered: 05/27/11
Posts: 2224
Loc: Oklahoma
Thanks John and to all who added input.
_________________________
Yeah, I'm a rifle loony.

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#7280421 - 01/07/13 Re: Favorite 257 Roberts Powders [Re: OSU_Sig]
efw Online   content
Campfire 'Bwana

Registered: 12/01/07
Posts: 12633
Loc: Mi.
I've had excellent results from Hunter, IMR-4350, H-380, and RL-15 in both standard & Better Bobs.
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I need a drink of something like water
I need a taste of love divine
Sometimes you just gotta do what you oughta
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#7281263 - 01/07/13 Re: Favorite 257 Roberts Powders [Re: efw]
n007 Offline
Campfire Ranger

Registered: 12/19/02
Posts: 2422
Loc: Victoria, BC, Canada
I have had my best accuracy and speed from Hybrid 100v. I have heard that there is some concern over temperature stability of Hybrid 100V, I can only give my experience.

Loaded up max load with 100grain TTSX, sighted rifle in at about 17 degress Celcius 63 F, shot at target a few months later at -2 Celcius 28F, there was no discernible change in where the rifle shot between the two temperatures.


Edited by n007 (01/07/13)

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#7282001 - 01/08/13 Re: Favorite 257 Roberts Powders [Re: n007]
bangeye Offline
Campfire Ranger

Registered: 09/26/10
Posts: 2298
Loc: KY
H414 and WW760

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#7282024 - 01/08/13 Re: Favorite 257 Roberts Powders [Re: bangeye]
Brad Offline
Campfire Kahuna

Registered: 10/31/00
Posts: 22654
I've been using the Rob on and off for over 20 years and have always used H4350... hard to beat as a do-all Rbt's powder.
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For Perspective, A Hobby Is Something To Pass The Time Until You Die.

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#7282027 - 01/08/13 Re: Favorite 257 Roberts Powders [Re: bangeye]
mjbgalt Offline
Campfire Tracker

Registered: 01/29/08
Posts: 6607
Loc: ohio
varget for varmint loads and H4350 for 100's and up
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I put Varget on my cornflakes...

inventor of Fart Lok scent control clothing.


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#7288043 - 01/09/13 Re: Favorite 257 Roberts Powders [Re: mjbgalt]
coyo Offline
Campfire Ranger

Registered: 06/08/07
Posts: 2080
Loc: land of OZ
Ive had excellent results with W-760
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broken bones broken heart stripped down an torn apart a lil rust but Im still runnin countin miles countin tears twisted roads and shiftin gears year after year its all or nothin Im not home and Im not lost just holdin on 2 what I got...God and Guns

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#7289145 - 01/09/13 Re: Favorite 257 Roberts Powders [Re: coyo]
davet Offline
Campfire Regular

Registered: 03/15/11
Posts: 411
I got better results with RL19 than IMR4350. I shoot 115 bt's and 117 btsp interlocks in my Roberts.

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#7298238 - 01/11/13 Re: Favorite 257 Roberts Powders [Re: bangeye]
GunTruck50 Offline
Campfire Regular

Registered: 07/07/11
Posts: 324
For Heavy bullets 110gr or over I use H4831SC or RL22.
For 100gr I use W760. Anything lighter I use IMR4064.

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#7307514 - 01/13/13 Re: Favorite 257 Roberts Powders [Re: GunTruck50]
deg967 Offline
Campfire Ranger

Registered: 07/20/07
Posts: 1668
Loc: ARKANSAS
Hey Mule Deer and EFW...
How bout sharing some of those loads for the H4350 & RL 15 ?? Using 100 grain Interlocks
I've got 3 BoBs
Ruger UL
Browning Medallion (Micro)
And a SC Model 70

Also have a New Haven Model 70 in .270 Win that really likes the RL15 (48grains) with 110grain TTSX


Edited by deg967 (01/14/13)

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