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Joined: Jul 2001
Posts: 60,156 Likes: 13
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,156 Likes: 13 |
24" barrel.
In my experience it's easy to get at least 2950 with 115s in a 24" barreled .257 Roberts with several powders.
Of course, I'm not using published data, because even +P data is limited to 58,000 PSI--which is pretty wimpy, less than the .30-06 SAAMI maximum average pressure of 60,000, which is itself far less than, say, the 65,000 MAP of the .270.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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Joined: Jun 2004
Posts: 44,863 Likes: 4
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2004
Posts: 44,863 Likes: 4 |
3000 FPS with a Bob? That's cooking with grease. I shoot a 115 BT from my 22 in Ruger at @ 2800 FPS with 44 gr of imr4350.
Hodgdon shows 45.5 grains of IMR 4350 with a 115 Partition for 2866 fps at only 46,600 CUP. If you extrapolate Hodgdon's data to 3000 fps the prediction is 47.84 gr IMR4350 at 51,025 CUP which isn't hot for a modern bolt action.
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Joined: Nov 2010
Posts: 578 Likes: 1
Campfire Regular
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Campfire Regular
Joined: Nov 2010
Posts: 578 Likes: 1 |
24" barrel.
In my experience it's easy to get at least 2950 with 115s in a 24" barreled .257 Roberts with several powders.
Of course, I'm not using published data, because even +P data is limited to 58,000 PSI--which is pretty wimpy, less than the .30-06 SAAMI maximum average pressure of 60,000, which is itself far less than, say, the 65,000 MAP of the .270.
I've pushed mine faster, but groups start opening up above 44 gr of 4350.
Dyin' ain't much of a livin' boy - Josey Wales
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Joined: Jun 2004
Posts: 44,863 Likes: 4
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2004
Posts: 44,863 Likes: 4 |
How far did you push? It may come back into tune before the load gets too hot.
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Joined: Nov 2006
Posts: 1,346
Campfire Regular
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Campfire Regular
Joined: Nov 2006
Posts: 1,346 |
I have used the CT version at 3100 out of a 25-284 a good bit and would not hesitate to use them in my 257 Wby. Even the mythical plated shoulders of hogs do not stop that little bullet.
GreggH
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Joined: Dec 2015
Posts: 8,303
Campfire Outfitter
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Campfire Outfitter
Joined: Dec 2015
Posts: 8,303 |
yes in all 3 - 257 Weatherby mag rifles i own they all shoot 115 B.T. good , but last year i used 115 gr. Berger bullets they shot well too but i feel they did better on the bucks i shot not as much meat damage , if that worries you . my 257 Roberts shoots 115 gr. B.T.`S like a bench rifle.
LIFE NRA , we vote Red up here, Norseman
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Joined: Jul 2001
Posts: 60,156 Likes: 13
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,156 Likes: 13 |
How far did you push? It may come back into tune before the load gets too hot. Yep, but in my experience it depends on the barrel and the bullet. Have gotten superb accuracy with the 115 Partition and 45.0 grains H4350. But then, that also depends on the rifle, particular lot of powder, etc. etc.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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Joined: Oct 2002
Posts: 13,440 Likes: 1
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2002
Posts: 13,440 Likes: 1 |
Pulled this out of the wayback machine.
Dog I rescued in January ![[Linked Image from i.postimg.cc]](https://i.postimg.cc/yYDjsxrQ/IMG-0124.jpg)
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