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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.338 differences
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<blockquote data-quote="Long Time Long Ranger" data-source="post: 483425" data-attributes="member: 505"><p>Outlaw45, The 338 RUM is not very popular and that is why it is offered in such few rifles. It is more popular though than the 338-300 RUM since it is a factory chambering but not quite as popular as the 338 Lapua. Bottom line is per capita the big 338's are not very popular outside this and a few other long range forums where we know these are the best for truly long range hunting. We are a minority in the hunting world and large companies are not going to give us many offereings because of that. Most guys are going to buy a 270, 30-06, 7mm mag or 300 winchester so they offer tons of those. As far as the 300 RUM being more popular just face the facts. Since the 60's with the 300 wby and 300 winchester the big 30's have always been the most popular primarily because of all the bullets available through the years and it was a good trade off between small and large calibers. Old habits are just really hard to brake. But times are a changing.</p><p> </p><p>sp6x6, you are right on the money. Any of the 338's from the 338 winchester on up are deadly on big game at 1000 yards+. I have taken large big game animals over 1000 yards with the 338 winchester, 340 wby, 338 RUM, 338-300 RUM, 338 Lapua and 338-378 Wby. At 9000 feet elk altitude the ultramags and lapua give you 300 yards over the 338 winchester, the 338-378 wby gives you 500 yards over it. I shot a moose at 1100 yards with my 338 winchester and numerous animals from 600-800 yards with it. I shot several animals with it this year from sheep to grizzly. The 338 winchester is one of the best cartridges ever developed because of the tremendous killing power vs light recoil. Even my wife enjoys shooting my tikka light 338 winny without a brake.</p><p> </p><p>I have made some amazing shots with my 340 wby through the years. It was my second long range rifle. My first was the 7mm-300 wby and then I realized the best long range rifle was necking the 300 wby to 338 instead of 7mm. I still have my original long range 340 wby from the 70's and it still shoots great. It shoots the 300 grain SMK at 2735 fps out of a 28" barrel with deadly accuracy. That is right in there with the ultramags. Overall though the 340 wby averages about 100 fps slower than the 338-300 RUM.</p><p> </p><p>Many people look at case capacity of 338's and think this one or that one must be faster because it holds 3-4 grains more powder. Not true with the 338's. It takes quite a bit of powder to make a difference with the 338's. I'm trying to remember my loads but around 10 grains more powder in the 338-300 RUM gives you about 100 fps over the 340 wby. Either will flatten an elk over 1000 yards. Been there/done that. 15-20 grains more powder in the 338-378 wby gives you about 200 fps over the 338-300 RUM. The 338 RUM, 338-300 RUM and 338 Lapua are all so close it is just a wash.</p><p> </p><p>I see on here all the time about this mythical 100 fps either of the last three is suppose to have over the other. You can take ten 338 RUM's and most will shoot 2730-2830 fps. An odd one may shoot near 2900 fps and the odd one may shoot near 2700 fps. But that is the range. Now take ten 338-300 RUM's and they will average 2730-2830 fps with the odd ones near 2900 or 2700 fps. Now take ten 338 Lapuas and they will average 2730-2830 fps with the odd one shooting near 2900 or 2700 fps. These are all 30" barrels with most accurate 300 grain loads. I have been there and done that on my 1000 yard range. Now where in the heck is this mythical/magical 100 fps one is suppose to have over the other. If you flat out push the 338 Lapua it will shoot faster than the other two but best accuracy loads are still within this range. I expect this is because the Lapua brass can be loaded to higher pressures giving it a slight advantage if you just want to max it out. But in all my testing the Lapua would most always reach a higher velocity before primer pockets loosenned. Although, again the best accuracy was within the range of the others.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 483425, member: 505"] Outlaw45, The 338 RUM is not very popular and that is why it is offered in such few rifles. It is more popular though than the 338-300 RUM since it is a factory chambering but not quite as popular as the 338 Lapua. Bottom line is per capita the big 338's are not very popular outside this and a few other long range forums where we know these are the best for truly long range hunting. We are a minority in the hunting world and large companies are not going to give us many offereings because of that. Most guys are going to buy a 270, 30-06, 7mm mag or 300 winchester so they offer tons of those. As far as the 300 RUM being more popular just face the facts. Since the 60's with the 300 wby and 300 winchester the big 30's have always been the most popular primarily because of all the bullets available through the years and it was a good trade off between small and large calibers. Old habits are just really hard to brake. But times are a changing. sp6x6, you are right on the money. Any of the 338's from the 338 winchester on up are deadly on big game at 1000 yards+. I have taken large big game animals over 1000 yards with the 338 winchester, 340 wby, 338 RUM, 338-300 RUM, 338 Lapua and 338-378 Wby. At 9000 feet elk altitude the ultramags and lapua give you 300 yards over the 338 winchester, the 338-378 wby gives you 500 yards over it. I shot a moose at 1100 yards with my 338 winchester and numerous animals from 600-800 yards with it. I shot several animals with it this year from sheep to grizzly. The 338 winchester is one of the best cartridges ever developed because of the tremendous killing power vs light recoil. Even my wife enjoys shooting my tikka light 338 winny without a brake. I have made some amazing shots with my 340 wby through the years. It was my second long range rifle. My first was the 7mm-300 wby and then I realized the best long range rifle was necking the 300 wby to 338 instead of 7mm. I still have my original long range 340 wby from the 70's and it still shoots great. It shoots the 300 grain SMK at 2735 fps out of a 28" barrel with deadly accuracy. That is right in there with the ultramags. Overall though the 340 wby averages about 100 fps slower than the 338-300 RUM. Many people look at case capacity of 338's and think this one or that one must be faster because it holds 3-4 grains more powder. Not true with the 338's. It takes quite a bit of powder to make a difference with the 338's. I'm trying to remember my loads but around 10 grains more powder in the 338-300 RUM gives you about 100 fps over the 340 wby. Either will flatten an elk over 1000 yards. Been there/done that. 15-20 grains more powder in the 338-378 wby gives you about 200 fps over the 338-300 RUM. The 338 RUM, 338-300 RUM and 338 Lapua are all so close it is just a wash. I see on here all the time about this mythical 100 fps either of the last three is suppose to have over the other. You can take ten 338 RUM's and most will shoot 2730-2830 fps. An odd one may shoot near 2900 fps and the odd one may shoot near 2700 fps. But that is the range. Now take ten 338-300 RUM's and they will average 2730-2830 fps with the odd ones near 2900 or 2700 fps. Now take ten 338 Lapuas and they will average 2730-2830 fps with the odd one shooting near 2900 or 2700 fps. These are all 30" barrels with most accurate 300 grain loads. I have been there and done that on my 1000 yard range. Now where in the heck is this mythical/magical 100 fps one is suppose to have over the other. If you flat out push the 338 Lapua it will shoot faster than the other two but best accuracy loads are still within this range. I expect this is because the Lapua brass can be loaded to higher pressures giving it a slight advantage if you just want to max it out. But in all my testing the Lapua would most always reach a higher velocity before primer pockets loosenned. Although, again the best accuracy was within the range of the others. [/QUOTE]
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