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#7275172 - 01/06/13 07:51 AM Favorite 257 Roberts Powders
OSU_Sig Online   happy
Campfire Regular

Registered: 05/26/11
Posts: 1258
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 08:22 AM Re: Favorite 257 Roberts Powders [Re: OSU_Sig]
Mule Deer Online   content
Campfire Oracle

Registered: 07/24/01
Posts: 33702
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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The ultimate concern of a rifle loony is rifle trivia. And why not? What else is as distracting from the really important concerns of everyday life?

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#7275485 - 01/06/13 08:58 AM Re: Favorite 257 Roberts Powders [Re: Mule Deer]
mart Offline
Campfire Ranger

Registered: 03/05/03
Posts: 1729
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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#7275509 - 01/06/13 09:03 AM Re: Favorite 257 Roberts Powders [Re: mart]
mudhen Online   content
Campfire Outfitter

Registered: 05/30/05
Posts: 8974
Loc: Boot Heel of New Mexico
The two 4350s are pretty much all that I use, as well.
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#7275729 - 01/06/13 09:56 AM Re: Favorite 257 Roberts Powders [Re: OSU_Sig]
MT_DD_FAN Offline
Campfire Regular

Registered: 12/29/06
Posts: 687
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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#7275825 - 01/06/13 10:21 AM Re: Favorite 257 Roberts Powders [Re: OSU_Sig]
StarchedCover Online   content
Campfire Regular

Registered: 06/04/10
Posts: 553
Loc: Michigan
Another vote for H4350.
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#7277562 - 01/06/13 04:51 PM Re: Favorite 257 Roberts Powders [Re: StarchedCover]
OSU_Sig Online   happy
Campfire Regular

Registered: 05/26/11
Posts: 1258
Loc: Oklahoma
Thanks John and to all who added input.
_________________________
Yeah, I'm a rifle loony.

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#7280421 - 01/07/13 10:33 AM Re: Favorite 257 Roberts Powders [Re: OSU_Sig]
efw Offline
Campfire 'Bwana

Registered: 11/30/07
Posts: 11445
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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#7281263 - 01/07/13 01:55 PM Re: Favorite 257 Roberts Powders [Re: efw]
n007 Offline
Campfire Ranger

Registered: 12/19/02
Posts: 2358
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 01:58 PM)

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#7282001 - 01/07/13 04:22 PM Re: Favorite 257 Roberts Powders [Re: n007]
bangeye Offline
Campfire Ranger

Registered: 09/26/10
Posts: 1961
Loc: KY
H414 and WW760

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