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416-338 and 338 Lapua whats the difference?

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Unread 08-08-2008, 09:06 AM
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Join Date: Jul 2006
Posts: 630
Originally Posted by Fiftydriver View Post
...Again, in this class of chamberings, you will see 15 to 18 fps per inch of barrel length for velocity increase.
Exactly, Longtimelongranger told me that year ago when I bought my lapua. I load my Lapua to get about 2700 and I have a 28" barrel.

The problem with the improved is that the hassle of fireforming the cases is not worth the added velocity gain. The Lapua is a very accurate cartridge but it not a super fast one. Velocity only gets you so far. If you want more then go with one the 338 edge. it is a 300 RUM necked up to 338. (FYI: the 338 RUM uses a smaller case that is why the egde uses the 300 RUM case which has more capacity) I believe he is getting a good 2900 from a smk. I can't recall exactly. The only thing required is a set of dies from redding. It pretty easy to neck up 300 to 338. And, you don't have to fireform. The only downside is that you don't get to use lapua brass but I believe Nosler Custom Brass makes 300 rum brass.

If you really want Hard hitting AND high velocity go with one of Kirby's Allen Magnums.
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Unread 08-08-2008, 09:07 AM
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Originally Posted by 300WSMMAD View Post
Roll yur own,
UM, I dont know its a retorical question, but, the research Ive done would indicate that out of a 30" barrel I would expect 3000 fps, the numbers youve said dont kinda add up to me thats all, 2750 fps is what I would expect out of a 24"-26" tube not a 30".
From ADIs web site 94.0 Grs AR2225 out of a 24" barrel gives you 2654 fps, rule of thumb 50 fps per inch, so with a 30" barrel 50fps x7 = 350fps faster, even a 28" will give you 200 fps faster.

Is 3000+ fps possible out of a 338 Lapua or do the numbers lie?

Thanks 300WSMMAD

Just for reference, down here at sea level, I get 3000 fps out of the Hall Express 338 Lapua Improved using the 300 SMK. I get many case reloadings at this pressure level, velocity spread is minimal (ie <10) and accuracy is very good. However, I have since switched to a 265gr aluminum tipped bullet with the same BC as the Sierra but it will fly 200 fps faster than the 300 SMK. I also get the same results (within 15 fps) out of an equivalent length Hall Express 338/378 using the same bullets.

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Unread 12-16-2016, 01:54 AM
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Join Date: Aug 2002
Location: Southern Illinois
Posts: 246
Re: 416-338 and 338 Lapua whats the difference?


Do I have to have a rifle assembled in your shop to shoot one of your cartridges? Or can I buy a reamer for the .338 Allen Magnum and the brass and have my gunsmith build a rifle around your .338 Allen Magnum?


Ralph Jones
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