Home Forums Reloading Big Game Rifles 257 Roberts favorite powder

efw,

My wife has been using 47.0 grains of Hunter with 100-grain Barnes TTSX's for a number of years now in her NULA .257. The load shoots very well at any temperature from zero to 80, into exactly the same place, taking antelope, whitetails, mule deer and elk. It's a good load!

Where we live with no big temp extremes, H100V is the champ.

If I hunted in extreme climates, I'd probably go with JB's Hunter load or a H-4350 load.

DF

Here's more info on the H100V load, 100 TTSX.

46 gr. 3,188 fps., .70" at a hundred (three shots).
47 gr. 3,266 fps., .438".
48 gr. 3,328 fsp., 1.7" and getting warm. Bolt lift was OK, case head with some bright spots from the bolt, primer OK.

I also shot an even tighter group with 115 gr. NBT over 44 gr. H-4350 at around 2,900+, didn't get a good chrono read. That's a good load, whacks hogs and WT's pretty well.

I was amazed by the 100 TTSX speed and accuracy, 47 gr. seemed to be the sweet spot with that combo.

DF

Shot my .257 just this morning to check zero before this Saturday's firearms deer season opener. 39.5gr. of IMR 4350 behind a Nosler 100gr. Ballistic Tip gave me 1-1 1/2" five shot groups @ 100 yds. so I called it good because the area I'll be hunting shots are 100-125yds..

Have you clocked that load? If I'm reading right it's more than five grains below Hodgdon's start load.

Did you mean 4895 rather than 4350?

That's the Nosler book's most accurate load with that powder, it also happens to be a starting load. I don't care what it chronos nor what Hodgdon book says, it works for me.

I just took a look, and that's a pretty big difference between data sets. Nosler's max is 1.3 grains below Hodgdon's minimum. Interesting.

I don't pay any attention to data from sources other than that for the bullets that I am using, too much conflicting information.

I find it aggravating when a bullet company's accuracy load is a low velocity starting load with a powder I don't want to use.

Oh well. I just keep looking, find my own accuracy load.

I get more good info from Fire contributors than from loading manuals. Of course, you gotta check'em out. Some Fire loads can be a bit "interesting", may not want to shoot those in my rifle...

DF

With 110grain Accubonds my model 70 likes RL26. Norma MRP, RL23, RL22, RL17.
RL26 produced the highest velocities with the 110gr and 115gr Nosler Partitions. I found Quickload
Numbers to be very accurate on my rifle.

Is one regular pressure and the other +p?
Loading some Bob this morning, H4350 and 100TTSX.

How much RL 26 you running with those 110's? How about with the 115 Partitions? I have had great luck with RL 22 & 115 Partitions but always looking to tinker

47.7gr RL23 110gr Accubond Win case CCI250 primer 3123fps Quiclload says pressure is 58,022
OAL 2.840

48.5gr RL26 11gr Nosler Partition Win case CCI250 primer 3133fps SD 6.0 these were 3 shot average

Back off about a Grain and a half to start loads. The above loads worked good in my pre 64 model 70 .
MRP also worked good.

Thanks for he info. I am running 48.0 grs of RL 22 with the 115 Partitions in my Remington 700 Mtn Rifle.

The RL23 load is near Max in my rifle. But the RL26 Load is well under Max. Shot the RL26 in my sons Remington 760 pump
and got 3008fps with no problems. The barrel on the model 70 seems to be fast and the 760 has a 22" barrel. I shoot more
115gr partitions because they are the most accurate bullet in both rifles.

Hybrid 100 V - and Barnes 100 TTSX👍

I'm still interested in RL-26 loads with heavier bullets. I'm not saying I've drunk the "26" Kool-Aid, but is does seem to be a dense, high energy powder with exceptional performance in a number of rounds. I would like to see a QL print out for 110/115 gr. bullets and RL-26 in the .257R.

I'd like to work up a high performance NPT/ NAB load.

DF

Ok, you dang enablers have caused me to buy some H100V to try in my Bobs.

DF: Maybe I missed it, but did you ever get a chance to check the velocity variance with temperature?

Also, where is there a good source of published data for 115-120 gr bullets thanks

Haven't temp-tested H100V in the .257 Roberts, but in my NULA .30-06 with 165 Hornady Interlocks it lost almost 200 fps between 70 and zero. Did not bother testing the load at temperatures over 70.

Wow. Sounds like It would not be prudent to work up a load in the winter to use in the summer!

Did you see a big difference in accuracy and POI Also?