Enduron powders:

[FOTIS]

IMR® Legendary Powders now offers four (4) Enduron powders: IMR 4166, IMR 4451, IMR 4955, and IMR 7977. Shooters looking for readily-available alternatives to hard-to-find extruded powders should definitely check out the Enduron line-up. Precision shooters will find an Enduron option well-suited to most of the popular precision cartridge types. For example, IMR 4166 is a good replacement for Hodgdon Varget (commonly used in the .223 Rem, 6mmBR and .308 Win), while IMR 4955 is a fine substitute for H4831 (favored by F-Open shooters for the .284 Win and 7mm WSM cartridges).

 

[bdbrown66]

I've done some loads with 4166. It's also very similar to IMR 4064.

 

[FOTIS]

Yup makes sense!

 

[SJB358]

Fotis, didn't they just release a big slow burner 83XX or something similar?

 

[TackDriver284]

Got a pound of each of the 4, but never got around to try them yet.

 

[FOTIS]

Fotis, didn't they just release a big slow burner 83XX or something similar?

There is imr 8208 xbr? It is more of a 223/308 powder.

But they do have IMR 8133 .....

IMR, a Hodgdon Powder Company brand, will soon release a new, slow-burn-rate magnum powder, IMR Enduron® 8133. This new powder is designed for large, magnum cartridges, such as .300 Win Magnum, .300 Remington Ultra Magnum, and 28 Nosler, among others. With the slowest burn rate among Enduron powders, 8133 has burn properties similar to Hodgdon Retumbo. The new Enduron 8133 powder will be available in 1-lb and 8-lb canisters starting in February 2018. Load Data for this new powder is already listed on the Hodgdon Reloading Data Center.

 

[SJB358]

That's the one!

 

[FOTIS]

YUP LOL

 

[DrMike]

I'm having trouble keeping up with all the advances in powder technology. Glad I'm not doing extensive load workups any longer.

 

[hogginlong]

Had good results with 4955 in the 6.5x55 with heavy bullets.

 

[gerry]

There have never been so many great powders like there are now. Locally Hodgdon and IMR powders are the easiest to get so we use mostly them here. Have good loads with both IMR 4451 and 7977, IMR 4955 looks promising in the 6.5x55 too so far. I'll probably try IMR 4166 sometime since it looks too good not to try. Have nothing to burn the new IMR 8133 but it will be interesting to see how well it works.

Of the older powders H 4350 and IMR 7828 are still used a lot and there is no reason for that to change.

 

[Bbear]

Have a nearly shot-out 25-06 that used to love a 120 gr Speer and IMR4831. I'm now chasing the lands and couldn't put enough 4831 in the case to make it work. Tried 7828, H4831, both 4350's and H1000. The figured, what the heck, and tried 7977. Bingo! .5-.75" groups with the 110 AB zipping along at 3200.

 

[Anonymous]

I've been working with 4166 in the .308 and .300WSM.

 

[gerry]

I've been working with 4166 in the .308 and .300WSM.

I'm curious to see how IMR 4166 works in your 300 WSM and what loads you come up with. Could make some easy shooting loads with mild recoil. Should be quite close to the RL 15 load I used to run in the 300 WSM.

 

[Anonymous]

I've been working with 4166 in the .308 and .300WSM.

I'm curious to see how IMR 4166 works in your 300 WSM and what loads you come up with. Could make some easy shooting loads with mild recoil. Should be quite close to the RL 15 load I used to run in the 300 WSM.

I loaded up some 165 ABs on top of charges of 56 and 57gr of 4166. The 57gr load showed good accuracy at 1" for five and just over 3000 fps. The 56gr charge was a solid 2950 and 1.5" for five shots.

I only did limited testing, but the results are good enough that I might do some more work with it in the future- possibly with lighter bullets. A 150gr between 3000 and 3200 should be a good caribou/sheep/deer load. I've had mixed results with 150s in the past in that rifle but should come up with something passable.

Truthfully- a 165gr at 3k will do about all the hunting I'll ever do. Recoil was pretty mild . I'm going to try 4955 and 4451 next, most likely with the 180AB that rifle loves.

Also on the list is trying to get a good load for 4451 in the 6.5CM.

So far I'm liking the Enduron powder and look forward to seeing if the anti-fouling properties live up to expectation.

 

[gerry]

Thanks for the info, that's one of the things I like about the 300 WSM is that they do well with fast burning powders unlike larger 300's. A load like your IMR 4166 load would be really nice to shoot. Going to save this thread for future use this fall

 

[Hammerdown]

I'm having trouble keeping up with all the advances in powder technology. Glad I'm not doing extensive load workups any longer.

I know the feeling. At 61, I rub my forehead and say, I'm not sure I want to do this again. Then again, I say, It might be great powder. I already have two of the four bought. I guess I'm going forward with this stuff.
308 Win.
338-06
30-06
That should be enough for now. I don't feel like shooting any large magnums. At times, I think about selling some of the guns I have. Time will tell.

Have a good day.

 

[lhsako]

Have a nearly shot-out 25-06 that used to love a 120 gr Speer and IMR4831. I'm now chasing the lands and couldn't put enough 4831 in the case to make it work. Tried 7828, H4831, both 4350's and H1000. The figured, what the heck, and tried 7977. Bingo! .5-.75" groups with the 110 AB zipping along at 3200.

A similar thing happened w/ my .270 back during the civil war. tried many powders....BAMMMM...RL22 sub inch !!!

 

[Alaska]

Trying to work up a load
30-06 (win 70)

IMR 4451
With 180gr Etip

Any suggestion

 

[DrMike]

Cartridge          : .30-06 Spring.  (SAAMI)
Bullet             : .308, 180, Nosler E-Tip  59180
Useable Case Capaci: 56.718 grain H2O = 3.683 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : IMR 4451 Enduron

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   89    45.99   2401    2303   43962   8460     93.7    1.282
-09.0   90    46.50   2426    2352   45272   8562     94.2    1.266
-08.0   91    47.01   2451    2400   46622   8663     94.6    1.249
-07.0   92    47.52   2476    2449   48012   8761     95.0    1.232
-06.0   93    48.03   2500    2499   49445   8858     95.4    1.215
-05.0   94    48.55   2525    2549   50921   8952     95.7    1.199
-04.0   95    49.06   2550    2600   52442   9045     96.1    1.182  ! Near Maximum !
-03.0   96    49.57   2575    2651   54009   9135     96.5    1.166  ! Near Maximum !
-02.0   97    50.08   2600    2702   55625   9223     96.8    1.151  ! Near Maximum !
-01.0   98    50.59   2625    2754   57292   9308     97.1    1.135  ! Near Maximum !
+00.0   99    51.10   2650    2806   59010   9392     97.4    1.120  ! Near Maximum !
+01.0  100    51.61   2675    2859   60781   9472     97.7    1.105  !DANGEROUS LOAD-DO NOT USE!
+02.0  101    52.12   2699    2913   62609   9550     97.9    1.091  !DANGEROUS LOAD-DO NOT USE!
+03.0  102    52.63   2724    2966   64495   9626     98.2    1.077  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    53.14   2749    3020   66441   9698     98.4    1.063  !DANGEROUS LOAD-DO NOT USE!
+05.0  104    53.66   2774    3075   68450   9768     98.6    1.049  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     99    51.10   2761    3047   68507   9337     99.9    1.050  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     99    51.10   2505    2507   49743   9064     91.6    1.211