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.338 lapua improved 40degree

 
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  #1  
Old 03-15-2010, 07:06 PM
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.338 lapua improved 40degree

I have decided to have a .338 lapua improved put together. I was wondering if i have a 29 inch barrel, how much velocity would i see with the 300gn. smk
thanks,
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  #2  
Old 03-15-2010, 08:50 PM
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Re: .338 lapua improved 40degree

What powder and amount are you thinking about running?
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  #3  
Old 03-15-2010, 09:28 PM
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Re: .338 lapua improved 40degree

a friend of mine said 100to102 grains of retumbo maybe a little more??
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Old 03-15-2010, 10:25 PM
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Re: .338 lapua improved 40degree

I thought I answered this for you on another thread. You are going to top out with best accuracy between 2850 and 2950 fps. Just depends on your barrel. In other words you should be able to get near 2950 fps out of it but your best accuracy may be under 2900 fps.
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Old 03-15-2010, 11:52 PM
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Re: .338 lapua improved 40degree

would i do any better with a 338-378 improved, i am looking for 3200fps without going to snipetac or allen mag. thanks for ur patience i am new to this long range world,
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  #6  
Old 03-16-2010, 09:15 AM
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Re: .338 lapua improved 40degree

You won't get those velocities using the 338 Excalibur/338-416 Rigby Imp/338-378 Wby Imp/338 Kahn, unless you use extremely long 38"+ barrels, and don't want to shoot your cases more than a few times

Here's a good post Kirby made regarding 338 velocities.
fastest 338 caliber?Build advice?

LTLR has owned them all...he'd be a good reference to query.

Let me suggest the following, since you stated you were "new" to the long range world....In order to obtain the best feedback possible from the forum on your rifle build, start a new thread called "Help me with my new long range build".

Define your build goals in the post by using the following points:

1. Your shooting experience?
2. Current reloading experience?
3. Budget?
4. Intended target-Paper/steel or fur or both. If fur list the critters (moose, bear, elk, caribou, deer, sheep, varmints, etc)?
5. Intended distance for the above target?
6. Desired weight (backpacker, horse, atv or truck hunter)?
7. Acceptable barrel life in # rounds before you should expect to re-barrel?
8. Prefer a SAAMI cartridge with off the shelf dies or a Wildcat with custom dies?
9. Do you prefer a Repeater or Single Shot?
10. Do you prefer a custom action or do you have a factory action you want to build from?

There are so many different ways to skin the proverbial cat, that without defining the above, the counsel/advice you receive may be piecemeal and incomplete...by outlining the above, your answers will be focused on your goals and preferences.

Please don't take my post incorrectly....the folks on LRH want you here on the forum, before, during and after your rifle build. But by doing the above you'll allow one central point for all the wisdom that's on the forum to contribute to your build. This forum isn't like others, that the senior smart folks don't have time for questions....great group here.

Good luck, and look forward to hearing about your build and be sure you post up with pics when it's done, and when you harvest something with it!
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  #7  
Old 03-17-2010, 10:43 PM
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Location: Wyoming
Posts: 2,615
Re: .338 lapua improved 40degree

Good post, your right 3200 fps is not possible without going to the chey-tac case. In a standard hunting weight rifle you could hit 3100 fps with a fast 30" barrel in something off the 378 case or 416 imp case. I have done it but that doesn't mean that is where your accuracy is going to be. The ones off the 378 case and the 416 rigby imp are the fastest ones out there unless you go to the chey-tac case. I have built about everything out there since the 70's trying to come up with the fastest in a hunting weight carry rifle. I have seven 338-378 wby's in various styles right now along with several other big 338's. Three of the seven get good accuracy loads in the 3050 fps range. That is about the best you can hope for. I had a 1000 yard range in the back yard behind my old shop and shot many rifles head to head. That majic bullet just ain't there. Accuracy is the key.
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