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<blockquote data-quote="Darryl Cassel" data-source="post: 1614" data-attributes="member: 34"><p>LTLR and to others here.</p><p></p><p>You are correct in the "Standard" 338/378.</p><p></p><p>The way to beat it is to Improve the case by blowing it out to a minimum tapor and putting a 35 degree shoulder on it. Now you have the powder capacity that my 338/416 IMP has except mine don't have the belt. This one will beat the velocities you mentioned quite handedly. </p><p>I am running the "300 Gr"in my 338/416 at 3310 FPS out of my ultra longrange deer and elk gun. Is is not however a carry gun.</p><p></p><p>The 338 Tomahawk (338 RUM Improved) is right there with the velocities your posting with your 338/378 and 250 gr bullets and that's on a Regular mag action and with 250 gr bullets also. I have a friend shooting the 338 Tomahawk and is well pleased.</p><p>He has stated many times that it is so close to his 338/378 that it's not worth mentioning the difference and he is doing it with a bit less powder.</p><p></p><p>With everything considered (cost wise), one getting into this game with limited funds would be well off looking at the 338 RUM on a standard mag action rather then going to a large custom or Weatherby action to handle the 378 case head.</p><p>The cost of any of the Norma, or specialty brass for the 378 is very high. </p><p></p><p>The next written material may be of interest to some on the forum who are trying to decide between a 30 cal and the 338 cal unless you use 300 gr bullets in the 338/378 or the 338/416 IMP.</p><p> </p><p>I can run the 30 cal 240 Gr Sierra MK in my Tomahawk at 3225 FPS and that bullet has a BC of .711. Compare that to "any" 338, 250 Gr at 3350 FPS and you will find that the BC of that one is only in the .587 range and that's a Sierra MK.</p><p>With long barrels on each caliber, the 240 gr will take over at 400 yards and beat the 250 gr 338 from there on out in every aspect.</p><p></p><p>Point is, the 338/378 can be beaten with a 30 cal shooting the 240 gr bullet from a factory mag action.</p><p></p><p>I still have one 30/378 and one 338/378 rifle laying around here too. Just for test purposes. </p><p>The 338/416 Rigby Imp with 300 gr bullets is my "go to" rifle for longrange and ultra longrange hunting though.</p><p></p><p>I just ran the ballistics on the 338/378 pushing the 250 Gr at 3350FPS and the Tomahawk pushing the 240 Gr at 3225 FPS. This will be interesting to many of you, I'm sure.</p><p>At 1000 yards the 338/378 with 250 gr bullets Has a remaining velocity 1916 FPS and a Foot pounds of energy of 2039 FP.</p><p>The 300 Tomahawk with 240 gr bullets at 1000 yards has a remaining velocity of 2039 FPS and a energy level of 2216 Foot pounds. Clearly the winner is the Tomahawk between the two bullets and calibers used.</p><p></p><p>My opinion would be to anyone interested in LR hunting and the 338 caliber, would be to make sure you go to the 300 gr bullet in the 338 or if you can't build a long enough barreled rifle to handle the 300 gr, you might want to consider the 300 Ultra or 300 Tomahawk with the 240 gr bullets. </p><p> </p><p>Just another opinion from someone who owns or have owned the calibers mentioned.</p><p></p><p>Darryl Cassel</p></blockquote><p></p>
[QUOTE="Darryl Cassel, post: 1614, member: 34"] LTLR and to others here. You are correct in the "Standard" 338/378. The way to beat it is to Improve the case by blowing it out to a minimum tapor and putting a 35 degree shoulder on it. Now you have the powder capacity that my 338/416 IMP has except mine don't have the belt. This one will beat the velocities you mentioned quite handedly. I am running the "300 Gr"in my 338/416 at 3310 FPS out of my ultra longrange deer and elk gun. Is is not however a carry gun. The 338 Tomahawk (338 RUM Improved) is right there with the velocities your posting with your 338/378 and 250 gr bullets and that's on a Regular mag action and with 250 gr bullets also. I have a friend shooting the 338 Tomahawk and is well pleased. He has stated many times that it is so close to his 338/378 that it's not worth mentioning the difference and he is doing it with a bit less powder. With everything considered (cost wise), one getting into this game with limited funds would be well off looking at the 338 RUM on a standard mag action rather then going to a large custom or Weatherby action to handle the 378 case head. The cost of any of the Norma, or specialty brass for the 378 is very high. The next written material may be of interest to some on the forum who are trying to decide between a 30 cal and the 338 cal unless you use 300 gr bullets in the 338/378 or the 338/416 IMP. I can run the 30 cal 240 Gr Sierra MK in my Tomahawk at 3225 FPS and that bullet has a BC of .711. Compare that to "any" 338, 250 Gr at 3350 FPS and you will find that the BC of that one is only in the .587 range and that's a Sierra MK. With long barrels on each caliber, the 240 gr will take over at 400 yards and beat the 250 gr 338 from there on out in every aspect. Point is, the 338/378 can be beaten with a 30 cal shooting the 240 gr bullet from a factory mag action. I still have one 30/378 and one 338/378 rifle laying around here too. Just for test purposes. The 338/416 Rigby Imp with 300 gr bullets is my "go to" rifle for longrange and ultra longrange hunting though. I just ran the ballistics on the 338/378 pushing the 250 Gr at 3350FPS and the Tomahawk pushing the 240 Gr at 3225 FPS. This will be interesting to many of you, I'm sure. At 1000 yards the 338/378 with 250 gr bullets Has a remaining velocity 1916 FPS and a Foot pounds of energy of 2039 FP. The 300 Tomahawk with 240 gr bullets at 1000 yards has a remaining velocity of 2039 FPS and a energy level of 2216 Foot pounds. Clearly the winner is the Tomahawk between the two bullets and calibers used. My opinion would be to anyone interested in LR hunting and the 338 caliber, would be to make sure you go to the 300 gr bullet in the 338 or if you can't build a long enough barreled rifle to handle the 300 gr, you might want to consider the 300 Ultra or 300 Tomahawk with the 240 gr bullets. Just another opinion from someone who owns or have owned the calibers mentioned. Darryl Cassel [/QUOTE]
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