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Joined: Apr 2016
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Greetings,

I am soon to begin reloading for the first time and would like any input regarding additional powder options for the 300 Win Mag cartridge. I have H1000 and IMR Enduron 7977 on hand at the moment. While I have read quite a bit and the Reloder powders sound interesting I live in the north and temperature stability is an important consideration to me (load work up in warmer weather and hunting in cold).

IMR 7828 and Retumbo are on my radar but I'd appreciate any thoughts from you all regarding which one or two additional powders I should consider for load development purposes.

Also, in case it may alter a recommendation I should add that these loads will be shot through a 26" barreled custom rifle throated for heavy for caliber bullets such as the 212 Hornady ELD-X and 215 Berger Hybrid.

Thank you.

R

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I think you are on the right track. H1000 is my current favorite in my .300 Win Mag but 7828 and Retumbo would be my next two choices. Especially with the heavier bullets Retumbo might get a bit more velocity.

I know a lot of guys love RL22 in that caliber and I have shot a bit of it but haven't had the best luck with it personally. Also, like you mention, RL22 is very temperature sensitive if that bothers you but honestly it usually isn't an issue unless shooting really far in extreme temperatures.

If you were running a little lighter bullets I really like IMR 4350.

Good luck

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While I've pretty much found R22 instability claims to matter not in the real world, H4831 will give what you desire.


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W780 was designed for that cartridge. Meters beautifully and is also great in the 300 winmag. also less erosive than stick powders. magnum primers required.

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I've had great luck with H4831


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mnimrod,

The problem with Reloder 22 (and other rather temperature-sensitive powders) isn't always just in longer-range shooting. Some rifles will change point of impact significantly even at 100 yards from 70 Fahrenheit to zero. I've seen three inches twice during my testing, and 1-2 inches isn't uncommon. Usually the rifles that do this are those that also change POI significantly with a change of a grain or two in the powder charge while working up loads.

This may not seem like much but the shift will be three times as much at 300 yards.


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You did not state what weight bullets you were going to shoot but i would look into RL-17.

It does some nice work in the 300 short mag from 130 to 190 grain bullets.

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1+ on Reloder 17. It appears to be temperature stable, and I've found it to give great top end velocities with 150-180gr bullets.


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IMR 4350
H4350
H4831
RL19


Originally Posted by raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.
Originally Posted by Pharmseller
You want to see an animal drop right now? Shoot him in the ear hole.

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I'm running RL25 in mine, but RL26, RL22, and RL23 all would work fine. Data is a little limited for RL23 and 26, but Alliant does have some online now.

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Try the two you have on hand before trying another powder.


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H4831SC works well, as does RE-22. I live and hunt in NWOntario, so at least some of my hunting is done at or below zero degrees. My 300 kills moose dead at any temperature.


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Ramshot Magnum has worked well for me ..

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Originally Posted by stlooiearch
W780 was designed for that cartridge. Meters beautifully and is also great in the 300 winmag. also less erosive than stick powders. magnum primers required.

"Stool Research" is Larry Root by yet another name... shocked

Larry, the .300 Win Mag was the OP's designated round...

"...also great in the .300 winmag"...??

crazy

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Originally Posted by Dirtfarmer
Originally Posted by stlooiearch
W780 was designed for the 300 WSM. Meters beautifully and is also great in the 300 WinMag. also less erosive than stick powders. magnum primers required.

"Stool Research" is Brian by yet another name... shocked



There DF corrected. too bad YOU have no experience/advice with the cartridge. chasing around the site, pirating threads, thinking you know something you do not.

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For 180's I would try H4831, IMR4350. For 200's, H1000 and H4831 are my picks.


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I've had great luck with 180's & 190's with both H4831 and H1000.

I read in a couple places where Mule Deer had written about the consistency of 75g of H4831 pushing a 180. In 3 different 300's I load for this has been a very consistent and accurate load. I've also had very low ES & SD's with it.

H1000 hasn't been far behind in either department, and it has delivered a touch more speed.

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H4831sc


I prefer classic.
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AA3100


Originally Posted by raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.
Originally Posted by Pharmseller
You want to see an animal drop right now? Shoot him in the ear hole.

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bsa

3100 is no more.

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