Filter

SOLD Desert Tech .338LM Conversion Kit 18"

An 18" .338 Lapua Magnum?

If you have a Desert Tech SRS A1 or A2, this is the most fun you can have with a rifle. This barrel has exactly 158 Rounds on it, all handholds, all Berger 250s. I can't find my test target, but it's a precise barrel as well.

I don't think the magazine ever actually had a round in it - to the extent it was used, it was used just to close up the mag well, because I single-fed everything into my rifle (I sold the rifle awhile ago, but held onto this just in case I picked up another one in the future, if that tells you how much I like it).

The TBAC .338BA Muzzle Device is not included, but I will include it for $80.00 (The muzzle device lived on a Barrett MRAD I had before this, so it has more than 158 rounds through it.

Let's talk ballistics. My middle-of-the-road load with 250 Bergers (2586 MV) went subsonic at about 1450 yards, which is almost exactly the same as a fairly hot 6.5CM 140Berger Hybrid out of a 24" barrel (2815 FPS MV). The difference is that it the .338LM is carrying 173% of the energy as a 6.5CM at 1450 yards (The .338LM has 150% more muzzle energy than a 24" 6.5CM). And that's with a 250 - a 300Berger Hybrid would outpace the 6.5CM by a long stretch. I never tested 300s, though, so I can't give you any real world data.

$850 Shipped CONUS.
IMG_0094.jpeg
IMG_0095.jpeg
IMG_0096.jpeg


IMG_0097.png
  • Love
Reactions: Sako man

300 Rum Build

The action is a Savage 110
The stock is a Bell and Carlson
I added AICS bottom metal and Mag
The barrel is a FAXON M24 Contour Blank 27" 1:10 Twist

First I zeroed the barrel in the lathe and cut the receiver threads, then chambered carefully. I then cut the muzzle for a brake 5/8 24. I had to seriously inlet the stock to free float this barrel.

Out at the range today, the rifle is shooting the federal fusion tipped 180gr over 91.5gr of N570 into a single hole, 7 shot group all can covered with a dime. Seems this one is good to go now. Very low recoil, like shooting a 22 250.

My data shows 91.5gr (Max safe published load) of N570 is around 64k pressure but I see NO SIGNS, running a 180gr pill at 3300fps should be serious medicine for the dear this year :)

Attachments

  • 300 Rum Rifle Build.jpg
    300 Rum Rifle Build.jpg
    1.5 MB · Views: 62
  • 300 RUM Group.jpg
    300 RUM Group.jpg
    1.2 MB · Views: 60

Curiosity Test.. Brake VS No Brake and Expander VS No Expander

Wondering if running my brake had an effect on accuracy and also whether using a neck expander or not effected accuracy. My data set is very small, I understand that, but was wondering what the results might indicate... Results are 5 shots each at 100 yards.
Equipment:
Tac Ops XRAY-51 .308, ZCO 5-27 scope, Alpha brass, Berger 115 flat base target bullet, CCI small rifle primer, VV N-135, 44.0gr. 2.190 ogive, @3025 fps. SAC modular sizing die, 334 bushing, 80 degrees, overcast, no wind.
Results:
Left side is no neck expander with 4 port Hawkins brake and with no brake.
Right side is using a 306 neck expander with the same brake and then with no brake.....

Assuming all things being equal... Not using the neck expander with No Brake appears to be the way to go. At least with my equipment. 5 shots measuring 0.097".
Tiny data set, but interesting to me.
IMG_20250807_174013998.jpg

Bedding question

Recently built myself a 6 dasher hunting rifle and I've got an odd cold bore flier. It always starts a half inch high for at least the first shot, sometimes the first two.

the action was already bedded from long ago but I had to redo the area around the recoil lug when I rebarreled it. Right now the lug is surrounded with bedding and a short portion about ¾" ahead of the lug.

My question is, should I relieve everything in front of and below the lug ?

I've done two other rifles the way I did this one and they shot well. No cold bore shift or anything put of the norm. Just this one giving me fits. Could be the cheap outlier barrel, but the barrel will group. Just dealing with this coldbore issue right now.