My shiny new light .338 Norma Magnum build thread!!

Tank308

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Texas
Played around with H-1000 and the 285 Hammer.

Didn't really have any solid data to go off of, but I know many people top out with the 300's around 88-89 grains, so I figured that this being a 284, and that generally Hammer bullets use the same or a little more powder than lead core bullets of the same weight to reach pressure, I would work from 87 to 80 in .5 grain increments, performance was as follows in these photos:

View attachment 174955View attachment 174956View attachment 174957View attachment 174958View attachment 174959

These were seated .020" off the lands, which gave an OAL of 2.833", these suckers are long ha ha. Seems like the bese accuracy seems to be high 2700's, but it's obvious there is a velocity node around 2730-2740, usually the accuracy falls in there, but not this time.

Overall pretty happy, what are y'alls thoughts of 2780 with a 285 in a 24" with H1000?
I think that is excellent. A 285 at creedmoor speeds. I'm riding your data coat tails. My 338 is a work in progress.
 

Westernhuntr

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291
Location
Idaho
Played around with H-1000 and the 285 Hammer.

Didn't really have any solid data to go off of, but I know many people top out with the 300's around 88-89 grains, so I figured that this being a 284, and that generally Hammer bullets use the same or a little more powder than lead core bullets of the same weight to reach pressure, I would work from 87 to 80 in .5 grain increments, performance was as follows in these photos:

View attachment 174955View attachment 174956View attachment 174957View attachment 174958View attachment 174959

These were seated .020" off the lands, which gave an OAL of 3.833", these suckers are long ha ha. Seems like the bese accuracy seems to be high 2700's, but it's obvious there is a velocity node around 2730-2740, usually the accuracy falls in there, but not this time.

Overall pretty happy, pressure wise, what are y'alls thoughts of 2780 with a 285 in a 24" with H1000?
That's outstanding man!
I just got my custom 338 NM put together over the weekend, I'll start a separate thread about it with details on my loads.
 

codyadams

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That's outstanding man!
I just got my custom 338 NM put together over the weekend, I'll start a separate thread about it with details on my loads.
There is some good data on that other thread you are part of, here :


I'll be updating that with 265 ablr data in the next few days hopefully as well.
 
Last edited:

codyadams

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Ok just finished up pressure work up with H-1000, RL-26 and IMR7828ssc and the 265 ABLR. Here is what I found:

Peterson brass
GM215M
Seated .070" off in standard CIP chamber, 3.535" OAL
16° F

H-1000:
87.5 - 2759
88.0 - 2773
88.5 - 2783
89.0 - 2812
89.5 - 2829
89.0 - 2818

Reloder 26:
85.0 - 2787
85.5 - 2792
86.0 - 2822
86.5 - 2843
87.0 - 2860
87.5 - 2863

IMR7828ssc:
84.0 - 2727
84.5 - 2759
85.0 - 2779
85.5 - 2801
86.0 - 2794
86.5 - 2829

Never had any signs of pressure whatsoever, 85.0-86.5 of RL26 all went in a .75" or so group, then the last two opened it up to 1-3/4" or so, 84.5-85.5 went in just under an inch, with the others it was around 2". I only got the last 3 on paper of H1000, I figured they would hit close enough to the Bergers and 285 Hammers that I didn't need a big sheet, but it took me 3 rounds to find where they were hitting. The last 3 of H-1000 made about a 1" group.
 
Last edited:

Westernhuntr

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Jan 5, 2020
Messages
291
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Idaho
Ok just finished up pressure work up with H-1000, RL-26 and IMR7828ssc and the 265 ABLR. Here is what I found:

Peterson brass
GM215M
Seated .070" off in standard CIP chamber, 3.635" OAL
16° F

H-1000:
87.5 - 2759
88.0 - 2773
88.5 - 2783
89.0 - 2812
89.5 - 2829
89.0 - 2818

Reloder 26:
85.0 - 2787
85.5 - 2792
86.0 - 2822
86.5 - 2843
87.0 - 2860
87.5 - 2863

IMR7828ssc:
84.0 - 2727
84.5 - 2759
85.0 - 2779
85.5 - 2801
86.0 - 2794
86.5 - 2829

Never had any signs of pressure whatsoever, 85.0-86.5 of RL26 all went in a .75" or so group, then the last two opened it up to 1-3/4" or so, 84.5-85.5 went in just under an inch, with the others it was around 2". I only got the last 3 on paper of H1000, I figured they would hit close enough to the Bergers and 285 Hammers that I didn't need a big sheet, but it took me 3 rounds to find where they were hitting. The last 3 of H-1000 made about a 1" group.
Nice
If you're loading the 265's at 3.635 you must have the boatail junction about 3/4 of the way down the case neck..
I'm not quite all the way down the neck at 3.60.
On a separate note, my loaded neck diameter with Peterson brass is .369, and fired diameter is only .370!
I bullet is tough to slide into a fired case, looks like I'll have to neck turn .001, that'll give me .002 neck clearance.
What are you at with your chamber?
 
Last edited:

sp6x6

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Messages
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Location
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Seem like mine where .370, Id have to go find notes, I originally just uniformed mine,skimmed them. But norma brass
 

codyadams

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Messages
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Location
Southwest Wyoming
Nice
If you're loading the 265's at 3.635 you must have the neck junction about 3/4 of the way down the case neck..
I'm not quite all the way down the neck at 3.60.
On a separate note, my loaded neck diameter with Peterson brass is .369, and fired diameter is only .370!
I bullet is tough to slide into a fired case, looks like I'll have to neck turn .001, that'll give me .002 neck clearance.
What are you at with your chamber?
Sorry, I meant 3.535 ha ha
20200211_121133.jpg
 

sp6x6

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Mines 1:975,you think a 270 superdozer would work they want 1:9
 

codyadams

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Location
Southwest Wyoming
Mines 1:975,you think a 270 superdozer would work they want 1:9
They were one that was on my short list to try, as a matter of fact I just ordered some, so they will be the next bullet I play with!! At 270 grains, and a listed BC of .803 G1, or somewhere in the .400-.410 G7 area, going 2875 fps they would actually have less drift than the 300 Bergers at 2700 fps, and also retain about the same energy by 1000 yards, and also have less recoil, and it is likely I can get more velocity than that too. So depending on how they perform, they may be my hunting bullet next season. Either way, it will be fun to play with them!! I know they shot lights out in a 270 Sherman that we tried them in....
 

codyadams

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Joined
Jan 7, 2015
Messages
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Location
Southwest Wyoming
On a side note, this Lilja barrel cleans up really easy. After about 150 rounds without a cleaning, I got it down to bare metal in about 15 minutes with Hoppes and sweets.
 

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