.300 Win Mag, 190 SMK, H1000

[bbarber25]

I’ve got two barrels for my .300 Win Mag, only difference between them is one is a 1-9” and the other is 1-10”, I use the 1-10” twist for practicing, plinking, coyotes. I have a solid load in both barrels with 215gr Berger’s and am dedicating my 1-9” barrel to hunting and ELR now. I have a plethora of 190gr SMk’s. I wanna use
Them on the old 1-10” barrel. I used to use RL22 with this bullet but after some poor product and poorer customer service I won’t use Alliant propellant. Anyone have any good loads with the 190 MK and H1000, also, was running .025” jump but open to other suggestions. Mag length isn’t an issue.

Thanks

 

[Zero333]

26" barrel liked 78 gr H-1000

24" Barrel with a little more freebore (than the 26"bbl) liked 79.4 gr H-1000.

COAL and relationship to the lands was irrelevant. Testing different COAL's was a waste of time.

H-1000 accuracy was good, but H-4831/H-4831sc was even better.

 

[rudysts]

26" barrel liked 78 gr H-1000

24" Barrel with a little more freebore (than the 26"bbl) liked 79.4 gr H-1000.

COAL and relationship to the lands was irrelevant. Testing different COAL's was a waste of time.

H-1000 accuracy was good, but H-4831/H-4831sc was even better.

I agree H4831 was also better for me.

 

[Deton8tor]

May be just me and my rifle, but H1000 behind 190's didn't do well for me. I went to IMR 4350, H4831 and Hybrid100v. All of those gave me very good speeds and accuracy. I do use H1000 with the 215, 220 and 230's with good results.

 

[bbarber25]

Thanks for the info guys, I’ll give H1000 a go, I’ve got a ton of it and run it with my 215’s, be nice to run just one powder. if I don’t find what I’m looking for I’ll give 4831 a go

 

[BronzeArcher]

Definitely try H1000 if you have it and want to stick with one powder. I've had H1000 work well with a range of bullet weights. But if you can't get a good load with H1000 and the 190 SMK, H4831 should be the next thing you try. 300 WM is a big case and tends to be sensitive to temperature issues. An insensitive powder is important. H1000 is best in this regard; H4831 is very good too. RL22 and ball powders are not good for long range precision in varying temperatures.

 

[MagnumManiac]

I would try H1000 before any other powder. My rifles top out around 79-80gr with the 190-200gr pills.
With 185/190/200gr pills, H1000 gives great accuracy, velocity may be down a tad against other powders but it will shoot real good. Another powder to try is Retumbo, it is generally faster, but you need to either swirl the powder into the case or use a long (12”) drop tube on a funnel. Swirling is faster. It is very accurate in the 300. 82-84gr will be max.

Cheers.

 

[Mr.Knowit all]

My 215s shoot very well with 73 gr. 7828ssc. CCI250, Norma brass
26 in. 1-9 Bart.

 

[klamathsteel]

bbarber25, curious what issue you had with Alliant powder ? I'm having great success with rl-23 in my 300WM and rl-17 in some of my 6.5mm stuff i have never needed to deal with their customer service though.

 

[fyrewall]

.300 W Mag -I like H1000 with the old 208 grain Amax but now I use other bullets of that approximate weight. I also have had great results using Re23 in the .300 WM with 178's. Surprisingly, 4000MR also works with 178's - 4000MR costs less than other powders and with charges over 70 grains per round some money is saved. H1000 & Re23 are temp change resistant but I have not used 4000 MR on hot days - the .300 WM is not a practical rodent rifle and that's all the hunting I do. My rifle has a 1-10 twist.

 

[Zero333]

bbarber25, curious what issue you had with Alliant powder ? I'm having great success with rl-23 in my 300WM and rl-17 in some of my 6.5mm stuff i have never needed to deal with their customer service though.

@bbarger25 was saying RL-22 is very temp sensitive powder, same as the majority of ball powders. I tried RL-22 and it was the most temp sensitive powder I've ever tested. I wouldn't hesitate using it for big game hunting within 200 meters. But otherwise I stay away from RL-22.
That's why Alliant made RL-23. To make a RL-22 type powder that's not temp sensitive.