Has anybody got any experience with retumbo powder in the 300RUM? Looking at the loading data on the can it seems to give higher velocities than other powders for this cartridge. - Can one expect these veloctiies to be close to what is listed?

I haven't. Been using Allient Reloader 25 in the two 300 RUM's I'm loading for with good results. I have been looking at it for my Rem 8mm mag. The guys over on the long range shooting forum seem to like it for that cartridge really well behind Sierra's 220 grain boattail spitzer..

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Bob from Idaho

I have had good luck with Rutumbo in my 300 RUM. I also use H1000, and depending on the weight of bullet, I pretty much am happy with those 2.

Velocities are consistant at mid loads. Haven't played with it much at heavy loads. Gives good velocities. Not the fastest, but top 5 usually.

2 thumbs up for Retumbo here.

Wish I could get some H870....

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Guns? I don't own any of those. Here is why:

http://www.shootersforum.com/showthread.htm?t=54318

I use Retumbo for both my 7mm Rem Mag and 25-06 (and my 300 Win Mag when I had one). It is a super powder for large case cartridges and medium to heavy bullets. I did not have as good success with H-1000. A problem with Retumbo is it's difficult to find.

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Remember - always have your democrats neutered or spayed - Ann Coulter

I think less so than it used to be Retumbo was as easy to find for me than any other powder.

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Guns? I don't own any of those. Here is why:

http://www.shootersforum.com/showthread.htm?t=54318

I tried Retumbo in both my 300RUM and my 7mm Rem. mag. Neither gun liked it. I settled on IMR 7828 and I've got a few 200 grainers loaded up for the 300RUM with RL25. A friend also tried Retumbo in his 338 Lapua. It didn't like it elther. Velocities were up there but accuracy was in the toilet. H870 gave about the same results i both guns. Fair accuracy and veloities but the 7828 did bettter. H1000 ran about the same as the H870. I've got a pound of the "new" US869 but haven't tried it in anything yet.

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r j - funny how that works, my experience was just the opposite. Retumbo increased accuracy in my guns. I just picked up 3 more pounds of it last week. Would have bought more but the 3 canisters was all the shop had in stock. I found 7828 to be pretty dirty by comparison and less accurate. Please post your findings when you shoot the US869. I haven't seen any of it in my neck of the woods but thought it would be worth a try. How much does it cost compared to the other powders?

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Remember - always have your democrats neutered or spayed - Ann Coulter

They don't make US869 anymore. They replaced it with H870, which is more stable, but is less effective. I wish they still made it though...

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Guns? I don't own any of those. Here is why:

http://www.shootersforum.com/showthread.htm?t=54318

I thought it was the other way around ... H870 (orginally said H380) was discontinued in favor of US869?

Edited for correction.

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Remember - always have your democrats neutered or spayed - Ann Coulter

They still make H380 and US869. Its listed on Hodgdon's Website. H870 is not listed though. With H1000 and 50BMG available as well, 870 isn't needed. If you really want H870, its available from gibrass.com as a pulldown powder, and Alliant's 8700 is also available.

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Dummy me ... I meant H870 in my previous post.

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Remember - always have your democrats neutered or spayed - Ann Coulter

I have used it in a 24 inch barrelled 300 Win Mag and 200 grain bullets. I followed Hodgdon's load data and chronographed highest velocities between 2950-3025 fps.Highest velocities were at less than max powder charges. Using 200 grain Nosler Partitions, I tried powder charges of 79.0 to 84.0 grains and got highest velocities at 82.0 to 82.5 as stated above. Velocities were closer to 2900 fps at 83.5 to 84.0 grains.

You are correct. I haven't been playign with my 300 RUM in about 8 months and diylexisized it.

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Guns? I don't own any of those. Here is why:

http://www.shootersforum.com/showthread.htm?t=54318

So far US869 seems to work very well in my 264 Mag.I have not done much shooting with that powder but what little I have done looks very promising.I shot one group at 600 yards that went inside 6 inches with Remington 140 gr Corelock Untrabonded bullets and 76 gr US869.Remington 700 CDL with a 26 in Fluted Barrel.I have not had the opportunity to chrono these loads yet.

I tried Retumbo in my .300 Weatherby behind 200 grain lead and it wasn't too good velocity wise or accuracy. My friend uses it in his .300 RUM, and swears by it. I think he's using 180 grain lead.

I was using h1000 in both my 7mm ultras and would periodically get a flyer, and vel. was good to moderate. Switched to retumbo and instantly got better groups and 3500 fps with 140 gr sierras.

Amen on the h 870.As much good things ive read about it , why was it discontiued?

SORRYguys, my spelling s--ks as so does my typing.

And I'm going to guess the higher charges weren't much of an accuracy brag, either? Velocity dropping with increasing powder charge is one of the many pressure signs, and is usually associated with groups opening up. You may or may not have seen any other pressure sign? None of them is entirely reliable, you just need to take heed of the one that show up first.

This whole thread is a goodf illustration of guns being individuals. If we had a big enough laboratory and enough time, we could probably track down the reasons for which powder works best in which gun? It will boil down to achieving a sweet spot in the barrel timing with an otherwise satisfactory load.

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Nick

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Let us know how it works with the 264, I've got a lb. of US869 just waiting for my neck die.

I saw one load reported for a Hornady 140 gr. SP over 78.6 grs = 3170 fps .8" @ 100. The note said in his Remington 700 it'll go 3200 +, sounds like a winner.