338 Lapua or 338 Lapua Improved

C

Chawlston

Guest
Hello,

I have a 338 Lapua barrel already and have been shooting it for two years. It is a 26" barrel and I get 3247 with 225 gr accubonds with less than 10 fps spread on my shots. I also had a reamer made up for a 30/338 Lapua Improved. I was thinking of using this reamer followed by a neck and then a throater to make a 338 Lapua Improved chambering.

So, today, I used my 5 foot drop tube and filled up the improved case with Retumbo that I had necked up to 338. Then, I took a standard 338 Lapua fired case and used the same 5ft drop tube and filled it up by dumping the powder from the improved case. I caught every granule of overflow and then weighed it and found that it was less than 3 grains of powder (actually 2.8 grains).

My new 338 barrel blank is 30" and I was ready to have it chambered in the 338 Lapua improved version. But, since I have seen such a small difference in useable powder capacity, I wonder if 2.8 grains of Retumbo is really worth the expense of the custom dies over a standard 338 Lapua in the same 30" barrel length from a performance standpoint.

So, my question is:

Has anyone tried this experiment before of one versus the other in the same length barrel and if so, which did you feel was the most worthwhile venture? Thanks in advance for the interest in this topic.

James
 

jwp475

Well-Known Member
Joined
Feb 4, 2005
Messages
2,622
Location
USA
After much soul searching I am building a 338 Laupa with a 30" ABS barrel I believe that I will be happy with the standard version I am planning on shooting the 325 grain wildcat bullets I sure hope that they work as I have purchased 910 of them...Stay tunned...
 

James H

Well-Known Member
Joined
Jan 15, 2006
Messages
505
Location
Nebraska
When I built my 338 Lapua I had originally intended to do one of the improved versions. After doing much research I decided to go with the striaght 338 Lapua.
I had Kregg Slack put the brake on it so before starting the project I asked him about it, since he had used both. He said go with the standard case as he was using the same load in the improved case as the standard case as that is where the accuracy was. That's what finally swayed me. If memory serves me he was using the 300gr SMK.

James
 

road warrior

Member
Joined
Mar 18, 2007
Messages
12
Location
B.C.Canada
I was talking with my new gunsmith the other day and I'm getting a 338 LM improoved built.He says his is pushing a 325 wildcat at 3015fps.I cant remember exactly but I think he said 108 grns of H 50 powder
 

Fiftydriver

Official LRH Sponsor
Joined
Jun 12, 2004
Messages
7,149
Location
Fort Shaw, Montana
A 1-10 will stablize anything up to the 350 gr ULD RBBT if you get velocities up to at least 2800 fps. This will not be a problem with the 325 gr version out of the Lapua or its improved brother.

I have shot the 350 gr ULD RBBT in my 338 AM and gotten them up to 3275 fps with top loads. Accuracy was very good in both my 338 AM and 338 Kahn which drives them to 2850 fps.

There are new bullets coming from Wildcat bullets in 338. If they prove to meet Richards accuracy standards they will put the 338 world on its ear!!! Lighter weight, longer bullets, extreme BC and very high velocity potential.

All this combined with a lead core design which should be very accurate with a wide range of bore diameters.

Test bullets should arrive anyday so you will get some reports soon.

Gone may be the day when you need +300 grains of bullet weight to get BCs in the +.9 range!!! This could be a very special advancment in out sport.

Kirby Allen(50)
 

jwp475

Well-Known Member
Joined
Feb 4, 2005
Messages
2,622
Location
USA
[ QUOTE ]
What twist did you get? I would of tried some first.
How long have you been waiting for the barrel?

Dave

[/ QUOTE ]
I have the 338 barrel, but I am still waiting for the 30 cal barrel,they were both ordered at the same time and paid for. I ordered a 1 in 9 twist but it came from Rock Creek barrels as a 1 in 10 twist and will finnish at 30". The 30 cal. barrel will be a 1in 8 twist and I am planning on the 265 grain wildcat bullet

Kirgy, I am aware of Richards new bullet and can't wait to here how the proto types shoot. This bullet should be AWSOME........
 

jwp475

Well-Known Member
Joined
Feb 4, 2005
Messages
2,622
Location
USA
[ QUOTE ]
If memory serves me he was using the 300gr SMK.
James

[/ QUOTE ]

What velocity and what barrel lenght?
 
C

Chawlston

Guest
Well, we decided to do the improved version since we already had a standard 338 lapua as a "walking barrel" and if it works the 338/378 could be eliminated from our barrelling options we consider optimum. You never really know until you test them on the exact same action. /ubbthreads/images/graemlins/wink.gif
 

Recent Posts

Top