257r

[dave-t.]

Any body out there have a wonderful recipe for me to try?

I have 117grn hornady btsp, H-380, and R19, on hand, but that could change if it needed to.

[southtexas]

I've gotten great accuracy and velocity with IMR4350, IMR4831 and H4831 with 117 and 120gr bullets in several 257 Bob's.

[snake river rufus]

Any body out there have a wonderful recipe for me to try?

I have 117grn hornady btsp, H-380, and R19, on hand, but that could change if it needed to.

Try 47.0 grs of RE-19 with the 117 gr. H-380 may be a bit fast burning for thr bob.

[dave-t.]

I'll try the 47g of R19. H-380 is fast for the heavier bullets, but seems to be used quite a bit for bullets 100grn and less in the Bob.

If I could find 4350 in H or IMR, I'd have some, but it's pretty slim pickins right now.

[crawfish]

I went a different way when I was loading for my Ruger #1 257 Roberts. I loaded 90g Barnes X bullets with 41.5g of RL15. They chronographed right at.3185fps. It was stolen in 1998. I still have the dummy check round and I think 60 rounds of loaded stuff in my gun vault.

[LeeInSC]

117-gr Hornady SPBT in a Remington M-700 with 24-inch barrel
2.775 inch COAL, CCI 200

RL-15
Start at 36.0 gr 2680
Max of 39.0 gr 2800 fps @ 47,500 CUP

H-380
Start at 37.0 gr 2670 fps
Max of 40.0 gr 2755 fps @ 45,900 CUP

[dave-t.]

Thanks guys.

Anybody load the Roberts over book max? I don't plan too, but it seems like one of a couple rounds that could get away with it. Its chambered in a ruger m77 tang safety, same long action that a 6mm rem, .270, or 7mm mag would come in from ruger, yet the Roberts is typically loaded so mild. It seems like it would be a candidate to push it another little bit, along with a modern 6.5 Swede.

Not saying I will push it, but it seems like some folks post up some pretty big numbers on internet reloading forums.

[StringJumper]

I acquired a 257 Roberts a few months ago. I have yet to hand load for it but the 117 grain bullet seems to be a fairly popular and generally accepted standard bullet weight for the 257. My question is....how did they arrive at a 117 grain bullet for this caliber? Why not 115 or 120 grain ?c:confused:

[Herne]

I used the Hornady 117g bullet in a Ruger M77 Mk 1.

CCI 200 primer. 42g Re22, for a loaded length of 2.920 inches. That's marked as a .75" group.

Very good cartridge, killed a lot of deer with that. Actually, that round and rifle (with a Swarovski Habicht 6x42 which is what I put on it) are still killing 50-60 deer a year, but not in my hands, but I do see it every now and again.

Danny -the answer to your question is the maximum length or length to diameter ratio you can stabilise for that twist rate, for the expected velocity, which translates into spin rate - at the maximum range expected, after spin decay.

[dave-t.]

I have that same Ruger 77 mI.

That is a lot longer oal than is listed in most books. I think 2.770 or 2.780 is the book max oal going by memory, but I may try to stretch it to that if it is what shoots the best. ;)

[Herne]

Dave - you know my system. I just tested for safety for that load, and then stood the thing out to near the lands, and kept shooting groups, each about .010 or 1/4 turn on the standard 1/4UNF thread bullet seaters, till it shot well. There is no particular merit in any length in fact, because you will depending on the undamped natural frequency of the barrel, get several nodes, and in some cases several nodes per inch of bullet setback.

The only advantage of being forwards is that you should get a more consistent shot start pressure. However, pretty is as pretty does. Somewhere in a couple of turns you'll get a decent group out of the gun.