My 338 Lapua Magnum by Cloud Peak Gunworks

[C.O. Shooter]

Pressure Test Complete (by .5 increments):
90 - 92 grs of H1000 / .020 off (3.009)

91.5 - Had ejector marks and slight bolt lift.
92. - Had ejector marks and heavy bolt lift.

All shots fired 2 minutes apart.

 

[C.O. Shooter]

Loaded up 3 at each charge:
90.3/90.5/90.7/90.9 of H1000 @ .020 (3.009).

 

[C.O. Shooter]

My next round will be:
90.2/90.4/90.6/90.8 of H1000 @ .020 (3.009).

 

[C.O. Shooter]

 

[C.O. Shooter]

90.4 produced the best SD 3/ES 5.

The group wasn't too great, I may have pulled it. Will definitely reshoot it to confirm.

Will load 90.4 @:
.020/.030/.040/.050/.060

 

[idcwby]

View attachment 322309

How far? What was it shot into?

 

[C.O. Shooter]

100 yards, state range, some type of finer stone, shale dust, or like leveling material.

 

[C.O. Shooter]

Getting ready to continue load development with the 275 grain SBDII's. 102 days until Wyoming.

 

[yobuck]

Well the fact that you posted the information, tells me that your looking for opinions?
If so, mine is that your wasting time and ammo, plus the wear on the barrel.
You dont need 100 yards in order to find velocity or a heavy bolt lift. Or even a target for that matter, just a pile of dirt will work fine.
Once you do find the velocity you like, there is no point to shooting 100 yard groups, especially with those type cartridges. 400 would be better, and seating depth changes might be better than playing around with small powder charge changes.
Get the best velocity first, then try to make it work with seating depth before moving on.

 

[C.O. Shooter]

Well the fact that you posted the information, tells me that your looking for opinions?
If so, mine is that your wasting time and ammo, plus the wear on the barrel.
You dont need 100 yards in order to find velocity or a heavy bolt lift. Or even a target for that matter, just a pile of dirt will work fine.
Once you do find the velocity you like, there is no point to shooting 100 yard groups, especially with those type cartridges. 400 would be better, and seating depth changes might be better than playing around with small powder charge changes.
Get the best velocity first, then try to make it work with seating depth before moving on.

Well lucky for me it's MY time, MY ammo, and not worried about MY barrel. Please move on…..

 

[C.O. Shooter]

 

[C.O. Shooter]

Not the outcome I wanted, but the outcome I got! The .020 off was tightest at 488 yards (Not including the cold bore shot, those two are about 1.5" apart). Conditions were perfect. The only adjustment I made was for elevation (7.5 MOA).

I am going to reshoot the .020 off and load a batch .010 off and see what happens. I wanted to give a big shout out to @jimbires for providing me access to an awesome range.

 

[jimbires]

it was nice to get to meet you , glad you enjoyed the range .

 

[C.O. Shooter]

I can't explain the point of impact shift from my last range session, but very happy with the results. I am going to go with .010 off. The group measured 2.5". Distance was 510 yards. Going to go over all my screws and make sure they're tight. Then I'll get it zeroed at 100 yards and attempt some longer distances time permitting. Thanks @171farm.

SD of 3.8
ES of 9