05-04-2008, 03:12 PM
| #1 |
| Banned | .257 Remington Ultra Magnum This should make one killer long range deer antelope rifle probably push a 100 gr bullet at 3800 fps with a 29-30 inch barrel. I am serious about building this one but just necking down a 7mm RUM build on a rem 700 action should be a great cheap wild cat, I know there is a 257 hot tamalie sp? but that is built on the STW case, the RUM case is a lot bigger, should result in a faster flatter hotter round |
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05-04-2008, 04:02 PM
| #2 | |
| Senior Member  | Quote:
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05-04-2008, 09:13 PM
| #4 |
| Senior Member | You lost me with light bullets.There are only three ways to get more range that I know of:increase velocity,cut drag,increase weight/energy.Light bullets in the same cal. have the same drag factor with less energy to resist drag.Drag is 125 times gravity so light bullets with less energy slow down faster than heavy bullets with higher energy. sam. |
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05-04-2008, 09:40 PM
| #8 | |
| Troll B' Gone   | Quote:
__________________ "Recoil lasts for a second, gravity lasts forever" | |
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05-04-2008, 09:50 PM
| #11 |
| Banned | well barrel life should be on par with the 223 WSSM and it would not be shot everyday but every couple months about 15 times and sell33 I will gladly make you one and reload for it if you pay for parts... it would be my honor just let me work the bugs out so I can make everything right |
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05-05-2008, 07:10 AM
| #12 | |
| Senior Member | Quote:
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05-05-2008, 07:55 AM
| #13 |
| Senior Member | Question Other than just having something fairly unique is this concept really going to give you an advantage in the field over established cartridges like the .257 Weatherby? Note: I do recognize many people have had and still do get a great deal of satisfaction from wildcatting. It just seems to me you are trying to out-Weatherby Roy Weatherby. But if this makes you happy then go for it. |
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05-06-2008, 12:24 AM
| #14 |
| Senior Member  | The 7mm rum is only supposed to last about 1000 rounds. Now thats fine if you only do hunting and very little target practise. An even smaller bullet going even faster i imagine the life span of the barrel to be even shorter. But for those first hundred rounds i imagine it would be a pretty flat shooting rifle. Be quite inefficient though.. You could also look at the Lazzeroni Scramjet which offers 3750 fps with 100 gr bullets. This is using a 27 inch barrel. It also comments that barrel life is quite limited and this cartridge should be used only for hunting. |
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05-06-2008, 05:33 AM
| #15 |
| Senior Member | Only put 1/2 powder charges in.That should double barrel life.Just a personal thought. sam. I remember years ago reading an article written by a gun whiz that told about a group that had a machine that they could make their own reloading dies.They proceded to make a die that put two shoulders in a cartridge,reducing it down from a normal -06 case and then on down to a smaller neck size.They had a picture of a case with two shoulders.They didn't go any further because they didn't have a rifle chambered for the new casing. While this was a joke,partially,and a demonstration that you could make any kind of die you could dream up,I wish I had the article to send to 338RUM as I believe with his inquisitevness,he could come up with something ingenious with a machine like that.Maybe even something that would work. sam. Last edited by samuel; 05-06-2008 at 06:44 AM. Reason: Automerged Doublepost |
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05-06-2008, 10:11 AM
| #16 |
| Banned | The 257 Weatherby is already way up there in barrel burner country. Index - Cartridge 604 - 30-30 752 - 308 794 - 223 Rem 969 - 260 Rem 969 - 6.5-243 WSSM 1102 - 22-250 1143 - .243 WSSM 1165 - 0.243 1230 - .220 Swift 1273 - 25-06 1329 - 300 Weatherby 1358 - 223 WSSM 1499 - 264 WM 1620 - 257 Weatherby 1746 - 30-378 Ron |
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05-06-2008, 11:29 AM
| #17 |
| Senior Member | If I wanted to use a certain cartridge,no matter how much the parttime experts yelled "BARREL BURNER",I would get that cartridge and enjoy it as long as it lasted.I wouldnt worry about "BARREL BURNING"until it happened.That is like worrying about dying and never doing the fun things because you may "BURN OUT".Hell yes you will burn out,but you can have a hell of a good time doing it. sam. |
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05-06-2008, 01:05 PM
| #18 |
| Banned | No problem with the concept of burning barrels -- after all I have a .264WM. However, if that is not an obstacle why not just go with a 257 Weatherby and save the wildcat hassle? I doubt that you can get bullets to go much faster than the Weatherby can. I recall it came out pretty close to the top in flattest trajectory -- for good reason -- big case. Ron |
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05-06-2008, 02:10 PM
| #19 |
| Senior Member | Ron:You ask 'why'.I never could figure out 'why'.All I know is I wanted to do it and had the bills paid,so I did it.One of my wildcats is a 6.5 Gibbs.It outshoots your Weatherby.You can get about 3300fps+ with your Weat.with a 120gr bullet.I can top 3450 with a 140gr .264.Mine will fly faster and flatter than the Weath.At 800yds I killed a paper target with a 6" bull verry dead.The problem is I just got tired of it.I spent a lot of money and never figured why I wanted to do it,except it would have bugged me forever if I hadnt.A lot of people shoot more rounds than I do,but they are more sane than me. sam. |
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