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416-338 and 338 Lapua whats the difference?

 
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  #1  
Old 08-07-2008, 07:37 PM
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416-338 and 338 Lapua whats the difference?

Hi Guys,
Im a little confused, Ive been told that a 416-338 is differet to a 338 Lapua, but all I can find on the subject is that they are one in the same thing?

In my quest for building a long reacher a friend of mine has been given a set of 3 reamers in a 416-338 IMP for me to have a look at to consider, will this be a improved 338 Lapua or a what they say a 416-338IMP?

Sorry for the questions Ive been posting but rome wasnt built in a day!

Bear with me,it will be built!

Thanks guys

300WSMMAD
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  #2  
Old 08-07-2008, 07:50 PM
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Prefer Lapua

You could build a 338 off the 416 Rigby or the 416 weatherby. They are similiar cases but the Rigby doesn't have a belt. The 338 Lapua is a much different case, way stronger and much better brass. Most people think the 338 Lapua or 338 Lapua AI are better than building around either 416. The Lapua would be my choice.
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Old 08-07-2008, 08:04 PM
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Yes with the info I have just got, I agree!
Im sure I can Hi jack my on post so,
in regards to velocities in a 338 Lapua what sort of FPS would I expect out of a 30' barrel?
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Old 08-07-2008, 08:58 PM
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300 smk about 2650-2700. Improved may go faster but not worth it IMO.

It is an accurate long range round but not a high velocity round.
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Old 08-08-2008, 03:08 AM
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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
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  #6  
Old 08-08-2008, 06:11 AM
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50fps is WAY too aggressive gains per inch.

My understanding is that 2800fps is about the max, even with a long barrel.

Loads For The 338 Lapua & 300 SMKs


AJ
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Old 08-08-2008, 08:26 AM
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The Rigby case has an overall length of roughly 2.900" and has little body taper. The Lapua has alot of body taper and is only 2.700" in length case wise.

So the Rigby has much more case capacity so it will produce more velocity right?????

Not really, its a weak case design, not really intended for use over 50,000 psi in its traditional load levels. Although the Lapua has a smaller case capacity its designed to handle much higher chamber pressures. In fact I have seen some tests were loads were using 70,000 psi loads and handling things fine.

The 338-416 Ricby will get you around 100 fps more then the Lapua because of its huge powder capacity. But if you use the improved version of the Lapua, it will also get you 100-150 fps more velocity as well and do so with less powder then the Rigby and no brass forming needed other then fireforming which is also needed with th e338-416.

The 338-378 Wby really made the 338-416 Rigby obsolete as they are basically the same thing but the Wby has the belted case design.

Again, in this class of chamberings, you will see 15 to 18 fps per inch of barrel length for velocity increase.
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