IMR 8133 .338 Edge

[Wolf76]

I'm running 92 GR of H1000 with a 300 GR Berger/accubond without pressure signs. Nosler brass 26" barrel.

 

[GWSpringer]

92.5 gr retumbo and 300 gr scenars for 2850 f/s works for me.

 

[robert l]

Bravo 4,

I would agree that 89.5 grains of H1000 is too hot and I built them that way so yes operator error. I know I'm not getting the speed I want if I have to back off to 87 grains or so to keep everything happy. I could just shoot 250 grainers or 300's slow, but that's not what I'm after. My goal was to get a 300grain bullet moving above 2800 FPS, 8133 did it perfectly.

I am .020 off the lands. I did try touching the lands, .020 off and .040 off with no change in pressure, I left this out of the original post to save the read time since there was no real useable info in it.

I don't know the exact numbers but the throat was long when it was a .338 RUM it was a single shot with an unusable mag. I had Joel put a Wyatt's mag in it so now that's not an issue. My COAL with SMK .020 off is 3.820". The barrel is past break in, my Dad put a decent amount of rounds through it as a .338 RUM

I went to the range today, unfortunately only 100 yards, more to see if data was holding together I guess than anything. 96 grains of 8133 and 300 SMK shot really good I would say, 2886 average speed with a 7 ES, 5 shot groups were just inside 1"

With the bullit at 20 off what is the coal???

 

[Soup]

And if you are breaking in the barrel you are to hot. i would start in the low to mid 80s. then after twenty to thirty rounds then start going up. i would start with 5 round groups then clean for the first 20 rounds good luck

Hello, long time looker first time post.

I searched on this issue and could not find anyone posting about the same problems I was having so I will share my story.

I inherited a "built" 700 Remington chambered in .338 RUM that was not new but very well taken care by my Dad, he had some health problems and gave me the gun. I had it reamed to .338 Edge by Joel Ackerman in ND.

I Resized .300 RUM brass, 300 grain SMK and tried to start low with the charge from what I had be reading was working. I shot 89.5 grains of H1000 and 90 grains of Retumbo. Both of these shot over pressure in this gun. H1000 left major ejector marks and a noticeably hard bolt to open, first shot on Retumbo was same, second on retumbo separated the case. But H1000 shot a really good group and retumbo was..eeehhhhhh.

So in reading I couldn't find much on the .338 edge and other powders. I found some IMR 8133 at the local running and got that. I built a ladder starting at 90gr to 97gr moving up one grain per bullet and was going to find where pressure started and pull the rest of the bullets back out that would be too hot. I headed to the range and shot all 8 rounds with ZERO pressure signs that I had from Retumbo and H1000. Weather has not been the best for the chronograph so I could not get speed readings for all bullets tested, I will post what I got below this speech.

IMR 8133 definitely cured my issues for pressure. All 8 shots stayed in about an 1" group at 100 yards which I found interesting. It meters very nicely and hopefully is a temp stable as stated. I am going to put some more bullets together to see grouping using a charge to get the average speed of where Shawn C. Is shooting 300gr SMK's and load a couple up that are shooting faster to see what that looks like. This was a long read but hopefully some guys out there having the pressure issues I was will find hope.

Remington 700
30" Krieger Barrel 1-10
Necked up .300 RUM Remington brass
Federal 215 primers
SMK 300 gr bullets

IMR 8133 - No Pressure signs

90gr - 2688 FPS
91gr - 2721 FPS
92gr - 2754 FPS
93gr - 2812 FPS
94gr - 2836 FPS
95gr - 2836 FPS
96gr - 2886 FPS
97gr - 2885 FPS

H1000

89.5gr - No speed HEAVY bolt, ejector marks. 5 shot group in .794"

Retumbo

90gr - No speed heavy bolt, ejector mark, separated case on second shot.

Stay tuned....

 

[Soup]

I am running a 28inch McGowan with 101.5 of RL33 pushing the 285 eld at 2925. shoots lights out and so far he RL 33 isnt showing temp sensitivity. That being said i work up all my loads in the summer heat instead if the cool seasons. Dont seem to have pressure issues with cold temps near as often as with heat

 

[701_outback]

With the bullit at 20 off what is the coal???

3.820"

 

[Soup]

3.820"

Im running it single shot due to length at 3.940

 

[701_outback]

Im running it single shot due to length at 3.940

That is as long as I can run them, have plenty of mag space, 3.820" is .020 off the lands.

 

[robert l]

3.820"

That might your problem If you are at 3.820 at 20 off so if u add 20 more u will be touching the lands at 3.840 or 50. Ok so if you use a vld bullets say a berger 300 gr. bullit. You can not load it out far enough to say 3.900 then you powder charge of 89.5 will have enough room to expand with out creating to much pressure. Im am thinking that there is not enough throat in the chamber to handle the charge. Its just a thought but i would check the throat to see how long it is.

 

[robert l]

That is as long as I can run them, have plenty of mag space, 3.820" is .020 off the lands.

Yep if you can only load out to 3.820 then that is your problem for sure.good luck i would take it back to the smith and have him rechamber it with enough throat to load up to 4.00.Then your problem will go away,bob.

 

[701_outback]

Yep if you can only load out to 3.820 then that is your problem for sure.good luck i would take it back to the smith and have him rechamber it with enough throat to load up to 4.00.Then your problem will go away,bob.

Yes I spoke with the smith. He said make up a round and he will build the chamber for it.

 

[robert l]

Yes I spoke with the smith. He said make up a round and he will build the chamber for it.

Thats good but he should charge you because that was on him. Unless that you told him that you would not be shooting any vld in the rifle.It sounds like that he just rechamberd the case and not any further that would explain the short freebore.the two cases are very close only the length is only differance..Well good luck with the rifle and it should shoot great after its fixed.Its a great caliber im very happy that i decided to go with the caliber. One thing that i would suggest is to use good brass such as nosler and up adg is by far the best but good luck getting it.And you have noticed that load data is hard to come by allso. so do your own and you will be happy. Bob.

 

[Wolf76]

I always used 338 Lapua data and figured there was a little room on the top end to play with.

 

[robert l]

I always used 338 Lapua data and figured there was a little room on the top end to play with.

There is enough out there to work off of .But i did alot of load work on my own.And then my range shut down the thousand yard down to six hundred so that slowed me down a bit.I am getting redy to do some work with hornadys new a max. I have heard good things about it. I will post on it in the near future.