pet loads for AW 338 lapua 27"

#2
Re: pet loads for AW 338 lapua 26"

Bill, your AIAWSM should have a 27" barrel, unless it was an older version I think.

Here are my loads:

250 scenars: 94.5 grains RL25, Fed 215M, Lapua brass, 3.600" about 3000fps out of my AIAWSM

300 SMK: 91.5 grains RL25, Fed215M, Lapua brass, 3.600" can't exactly recall the velocity on it.
 
#4
Re: pet loads for AW 338 lapua 26"

My AIAWSM in 338LM is brand new and its a 27" 1/11 twist.As DesertHK can tell you-they are stiff loads. I shoot 92grains behind a scenar or 93 with a 250SMK loaded to 3.602" (Mag length) and get 5 shot 2.5" groups at 300Yards with each. I've had 4 338LM's and found that if you really want to shoot 300SMK's the best barrel I had was a 1/9.3 twist.That would shoot 5 shot 1 inch groups with 88gr. of RL25 with the 300SMK. (2870fps 30" barrel) I have yet to try shooting the 300SMK's through the AI yet-I anticipate decent accuracy.

You can have GAP machine a Bartlein barrel with a match chamber-screw it on and you'll see an improvement. AI guarantees 1 moa. I'm seeing better than that-but it isn't the most accurate 338LM I've owned. Its a tactical rifle and 1moa is enough. I've fired over 6000 rounds of 338LM. The most accurate loads are on the MAX side. Shooting @ 100 yards to develop long range loads has never worled for me. Let it stretch its legs and you'll be satisfied.
 
#5
Re: pet loads for AW 338 lapua 26"

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bill Stoffels</div><div class="ubbcode-body">Thanks HK

its probably is a 27" but its not here yet.

How are they grouping for you ?

Thanks for the loads. are the barrels a 1 in 10 twist?? </div></div>

Both group just fine definitely sub MOA capable of about 1/2 MOA if I do my part. Like Lt. Archlight said, mine is also a 1:11". It has no problem stabilizing the 300 SMK pill out to about 1575 yards. (Haven't tried it further). Also agree with him that if you want to improve your groupings further, would consider a Bartlein's barrel. George at GAP can make one I am sure.
 
#6
Re: pet loads for AW 338 lapua 26"

Should I ocw test at say 300 yards?
Bill

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lt. Arclight</div><div class="ubbcode-body">My AIAWSM in 338LM is brand new and its a 27" 1/11 twist.As DesertHK can tell you-they are stiff loads. I shoot 92grains behind a scenar or 93 with a 250SMK loaded to 3.602" (Mag length) and get 5 shot 2.5" groups at 300Yards with each. I've had 4 338LM's and found that if you really want to shoot 300SMK's the best barrel I had was a 1/9.3 twist.That would shoot 5 shot 1 inch groups with 88gr. of RL25 with the 300SMK. (2870fps 30" barrel) I have yet to try shooting the 300SMK's through the AI yet-I anticipate decent accuracy.

You can have GAP machine a Bartlein barrel with a match chamber-screw it on and you'll see an improvement. AI guarantees 1 moa. I'm seeing better than that-but it isn't the most accurate 338LM I've owned. Its a tactical rifle and 1moa is enough. I've fired over 6000 rounds of 338LM. The most accurate loads are on the MAX side. Shooting @ 100 yards to develop long range loads has never worled for me. Let it stretch its legs and you'll be satisfied. </div></div>
 
#7
Re: pet loads for AW 338 lapua 26"

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lt. Arclight</div><div class="ubbcode-body">My AIAWSM in 338LM is brand new and its a 27" 1/11 twist.As DesertHK can tell you-they are stiff loads. <span style="color: #FF0000">I shoot 92grains behind a scenar or 93 with a 250SMK loaded to 3.602" (Mag length) and get 5 shot 2.5" groups at 300Yards with each.</span> I've had 4 338LM's and found that if you really want to shoot 300SMK's the best barrel I had was a 1/9.3 twist.That would shoot 5 shot 1 inch groups with 88gr. of RL25 with the 300SMK. (2870fps 30" barrel) I have yet to try shooting the 300SMK's through the AI yet-I anticipate decent accuracy.

You can have GAP machine a Bartlein barrel with a match chamber-screw it on and you'll see an improvement. AI guarantees 1 moa. I'm seeing better than that-but it isn't the most accurate 338LM I've owned. Its a tactical rifle and 1moa is enough. I've fired over 6000 rounds of 338LM. The most accurate loads are on the MAX side. Shooting @ 100 yards to develop long range loads has never worled for me. Let it stretch its legs and you'll be satisfied. </div></div>

What powder?

I've used H1000, RL22 and RL25 with the 250's and H1000, RL25, IMR4850 and Retumbo with the 300's.

H4850 and Retumbo appear to be the best for the 300's out of my rifle.
 
#8
Re: pet loads for AW 338 lapua 26"

Bill, your new rifle will have a 27" fluted 1/11", as long as it is new. I have been shooting these rifle for a number of years as well, I have the 1/11" and 1/10" barrels both, but the new Bartlein barrels we are offering this year directly from AINA will be a 1/9.3" @ 27" which is geared more towards the 300gr and sub-sonic .338's as well. Enjoy and best wishes.
 
#11
Re: pet loads for AW 338 lapua 26"

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BHP9</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lt. Arclight</div><div class="ubbcode-body">My AIAWSM in 338LM is brand new and its a 27" 1/11 twist.As DesertHK can tell you-they are stiff loads. <span style="color: #FF0000">I shoot 92grains behind a scenar or 93 with a 250SMK loaded to 3.602" (Mag length) and get 5 shot 2.5" groups at 300Yards with each.</span> I've had 4 338LM's and found that if you really want to shoot 300SMK's the best barrel I had was a 1/9.3 twist.That would shoot 5 shot 1 inch groups with 88gr. of RL25 with the 300SMK. (2870fps 30" barrel) I have yet to try shooting the 300SMK's through the AI yet-I anticipate decent accuracy.

You can have GAP machine a Bartlein barrel with a match chamber-screw it on and you'll see an improvement. AI guarantees 1 moa. I'm seeing better than that-but it isn't the most accurate 338LM I've owned. Its a tactical rifle and 1moa is enough. I've fired over 6000 rounds of 338LM. The most accurate loads are on the MAX side. Shooting @ 100 yards to develop long range loads has never worled for me. Let it stretch its legs and you'll be satisfied. </div></div>

What powder?

I've used H1000, RL22 and RL25 with the 250's and H1000, RL25, IMR4850 and Retumbo with the 300's.

H4850 and Retumbo appear to be the best for the 300's out of my rifle. </div></div>

Sorry, Bill, RL25. I've been through ALOT of powders. 4350,VV560,VV24N41,H50BMG,US869,RL22 and Retumbo. I've had the best results with RL25. US869 works well with MAX loads under the 300SMK and meters well (ball powder). YMMV. Good Luck. 87-89Gr. of RL25 is my load for the 300SMK most of the time.

Also: I zero at 300yards and do all my load development at 300yards. Bugholes at 100yds with a 338LM doesn't trasnlate to long range accuracy.at least IMO-others it may have...
 
#12
Re: pet loads for AW 338 lapua 26"

Lt. Arclight, what is your experience with the argument that the round can tend to yaw at shorter distance and needs a little more distance to stabilize? Is this urban legend or have you seen empirical evidence?
 
#13
Re: pet loads for AW 338 lapua 26"

Thank you
Very much

Bill

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lt. Arclight</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BHP9</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lt. Arclight</div><div class="ubbcode-body">My AIAWSM in 338LM is brand new and its a 27" 1/11 twist.As DesertHK can tell you-they are stiff loads. <span style="color: #FF0000">I shoot 92grains behind a scenar or 93 with a 250SMK loaded to 3.602" (Mag length) and get 5 shot 2.5" groups at 300Yards with each.</span> I've had 4 338LM's and found that if you really want to shoot 300SMK's the best barrel I had was a 1/9.3 twist.That would shoot 5 shot 1 inch groups with 88gr. of RL25 with the 300SMK. (2870fps 30" barrel) I have yet to try shooting the 300SMK's through the AI yet-I anticipate decent accuracy.

You can have GAP machine a Bartlein barrel with a match chamber-screw it on and you'll see an improvement. AI guarantees 1 moa. I'm seeing better than that-but it isn't the most accurate 338LM I've owned. Its a tactical rifle and 1moa is enough. I've fired over 6000 rounds of 338LM. The most accurate loads are on the MAX side. Shooting @ 100 yards to develop long range loads has never worled for me. Let it stretch its legs and you'll be satisfied. </div></div>

What powder?

I've used H1000, RL22 and RL25 with the 250's and H1000, RL25, IMR4850 and Retumbo with the 300's.

H4850 and Retumbo appear to be the best for the 300's out of my rifle. </div></div>

Sorry, Bill, RL25. I've been through ALOT of powders. 4350,VV560,VV24N41,H50BMG,US869,RL22 and Retumbo. I've had the best results with RL25. US869 works well with MAX loads under the 300SMK and meters well (ball powder). YMMV. Good Luck. 87-89Gr. of RL25 is my load for the 300SMK most of the time.

Also: I zero at 300yards and do all my load development at 300yards. Bugholes at 100yds with a 338LM doesn't trasnlate to long range accuracy.at least IMO-others it may have... </div></div>
 
#14
Re: pet loads for AW 338 lapua 26"

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DaveV</div><div class="ubbcode-body">Lt. Arclight, what is your experience with the argument that the round can tend to yaw at shorter distance and needs a little more distance to stabilize? Is this urban legend or have you seen empirical evidence? </div></div>

Its not an urban myth,Arthur Pesja describes it mathematically in his book.That's not what I'm talking about though. You don't buy a 338LM to shoot groups at 100 yards. 1 inch groups at 100 don't automatically equal 10 inch groups at 1000.

Its been my experience that if it is accurate at 300-it is USUALLY accurate at longer ranges. So would I call it empirical evidence? I wasn't trying to prove a hypothesis about gyroscopic stability. My point,only supported from MY experience is that I have never developed a good long range load by shooting at 100 yards.
 
#15
Re: pet loads for AW 338 lapua 26"

I was just curious if you have seen unstable flight at shorter distance. Thanks for your reply.
smile.gif
 
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