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.338 differences

 
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  #1  
Old 03-03-2011, 04:19 PM
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.338 differences

I see some guys talking about .338 Edge and .338 Lapau. I looked at ammoguide.com to see what the differences were but then found four or five more .338's - RUM, etc.

Is there one that is more commonly used? If so, why? Major differences or just a preference sort of a thing?

Thanks,
Darby
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  #2  
Old 03-03-2011, 06:59 PM
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Re: .338 differences

This may not be spot on or complete 1958-338win,1962-340 wtby,1988-338-378 wtby,1989-338 lapua,2000-338 rum,338 edge,338ultramax,338 kahn,338 allen-x,2009-338 norma mag, think theirs 2 allens, lazeroni,nawaka? 338 GIBBS,a-sguare,jarrett,dakota,arnold,fedral WOW THE 338 is popular
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  #3  
Old 03-03-2011, 07:15 PM
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Re: .338 differences

Just a prefference sort of thing. Slight increases in performance as you go from the blown out improved "06 cases to the 338 winchester, then to the 340 wby which is knocking on the door of the 338 RUM, 338-300 RUM and 338 Lapua which are all three the same thing performance wise. Then a little step up to the 338 Lapua Improved then a slight step up to the 338-378 WBY. Then a slight step up again to the improved 338-378 Wby, 338-416 Rigby and Excalibur size cartridges. Now from the 340 Wby to the improved 338-378 wby and similar class cartridges there is about 300 fps difference. Everything else fits between these except the 338 winchester and improved '06 cases which are below the 340 wby. So in a nutshell there you have it. Just a prefference sort of thing.
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Old 03-03-2011, 09:29 PM
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Re: .338 differences

Quote:
Originally Posted by sdkidaho View Post
I see some guys talking about .338 Edge and .338 Lapau. I looked at ammoguide.com to see what the differences were but then found four or five more .338's - RUM, etc.

Is there one that is more commonly used? If so, why? Major differences or just a preference sort of a thing?

Thanks,
Darby
The previous posts covered the history well.

By far the most popular .338 is the .338 win mag, but that's likely mostly because it's been around a long time & it's powerful enough "to get the job done" in most hunting situations. The .340 Weatherby (which is a .338) added more powder to increase the speed of the .338 Win., and is widely considered the best elk round ever created.

The hotter .338 cartridges are more than most can shoot without a muzzle brake and are normally chambered in weapons weighing 12 pounds or more often weighing much more.

The .338 Federal & .338 Ruger both came about recently to get a .338 into an action too short for a .338 Win mag.
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  #5  
Old 03-04-2011, 12:37 AM
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Re: .338 differences

The two you mentioned, the 338 Lapua and 338 Edge, have virtually identical performance. If you wanted to flat out push both to the max the 338 Lapua can be pushed to slightly greater velocity probably because of the much higher pressures the Lapua brass will withstand. The 338 Lapua was developed by Lapua in the late 1980's (about 1989 I think). It became popular during the mid to late 90's in this country primarily as wildcatters like me started improving the case and seeing what we could get out of it. I was in continuous communication with guys around the country and at Sierra Bullets as we all compared notes on what the top improved versions were getting performance wise or basically which ones were the best. The base cartridge is a shortenned 416 Rigby case. The full length parent cartridge improved had been a top wildcat 338 along with the 338-378 wby for many years . I know I started fooling with these during the 1970's and they were already very popular at that time.

The 338 Edge is the 338-300 RUM. It goes by many names however edge seems to work on this site best. The fine gunsmith and strong promoter of the long range hunting sport Shawn Carlock who is on this site started working with it in 2001 and named it edge out of his shop according to his article on it. Overall there are probably more barrels stamped 338-300 RUM than any of the other names. The cartridge began in late 1998 when the specs of the soon to be released 300 RUM were leaked to some and wildcatters went to work. The cartridge became popular with several gunsmiths during 1999 and 2000. It has continued to have a very good following because it can be done on a standard magnum action making it a cheap build with readily available cheap remington brass.

By late 1998 I was doing the 300 RUM necked to 7mm, 8mm, 338 and 358. My primary interest was the 338 version since I had been looking for years for a case that would beat a 340 wby on a standard magnum action. So I immediately jumped all over necking the 300 RUM and many were very impressed by the results. During the 1999 elk season several rifles I had done took elk at long range and recieved glowing reports. To my knowledge an elk taken in October of that year in Colorado was the first to succumb to the 338-300 RUM. The only way anyone could have been doing the cartridge before late 1998 would have to be an insider at remington.

Several shops including me quit doing the 338-300 RUM in 2001 with the introduction of the 338 RUM. Through extensive testing both cartridges deliver basically the same performance. The 338 RUM offered several advantages with cheap RCBS dies and over the counter brass. Being slighty shorter it was easier and cheaper to get it feeding better through standard magnum actions which was the beauty of the cartridge. Like Remington had told us at the 2001 shot show it delivered the same performance as necking the 300 RUM to 338 but fed better through the remington actions with long 338 bullets with less modifications. Some of us just saw no reason after 2001 to continue wildcatting the 338-300 RUM. Both are excellent cartridges with excellent accuracy and capable of killing animals well beyond the capabilities of all but the top marksmen on the planet.
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  #6  
Old 03-04-2011, 02:13 AM
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Re: .338 differences

Thanks guys, good read.

LTLR, Is there a standard 338 LM Imp? Shoulder angle 35*? Shoulder diameter?
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  #7  
Old 03-05-2011, 09:51 AM
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Re: .338 differences

Thank you! That was what I was looking for in the way of information - much appreciated.
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