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Retumbo or H50BMG in 32" 300 RUM?

 
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  #8  
Old 09-02-2013, 10:41 PM
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Re: Retumbo or H50BMG in 32" 300 RUM?

I'd be thinking of rl33 in your 30 rum. I'm working with it in my 30 rum bdl lh and she's consistantly sub moa with the 225 hornady hpbt and usually 1/2 moa. Good case fill too. Rl50 was a bit harsh on case fill when I tried it last year.
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  #9  
Old 09-03-2013, 12:22 AM
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Re: Retumbo or H50BMG in 32" 300 RUM?

Quote:
Originally Posted by Lefty7mmstw View Post
I'd be thinking of rl33 in your 30 rum. I'm working with it in my 30 rum bdl lh and she's consistantly sub moa with the 225 hornady hpbt and usually 1/2 moa. Good case fill too. Rl50 was a bit harsh on case fill when I tried it last year.
I actually considered buying some several months ago to try for this project. However, no one has been able to convince me that RL33 is any less temp sensitive then other Alliant powders. I have asked that question on this forum before. RL22 is particularly bad. I had a really bad experience with 22 several years ago and switched to Hodgdon Extreme powders in everything I load for. If someone wants to do a temperature test on a hot summer day with hot ammo verses ice bagged ammo and shows that there is very little velocity difference I might consider it. I just have not been able to find that information yet.
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  #10  
Old 09-03-2013, 01:06 AM
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Re: Retumbo or H50BMG in 32" 300 RUM?

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Originally Posted by Tumbleweed View Post
I actually considered buying some several months ago to try for this project. However, no one has been able to convince me that RL33 is any less temp sensitive then other Alliant powders. I have asked that question on this forum before. RL22 is particularly bad. I had a really bad experience with 22 several years ago and switched to Hodgdon Extreme powders in everything I load for. If someone wants to do a temperature test on a hot summer day with hot ammo verses ice bagged ammo and shows that there is very little velocity difference I might consider it. I just have not been able to find that information yet.
I also prefer the Hodgdon powders but they are not completely insensitive to temp changes. I have seen 100 fps shift in velocity from one lot to another of Retumbo and heard similar of H1000. Not sure about RL33 but I suspect it's more temp sensitive than the Extreme powders but maybe less than the other Alliant powders.

Bottom line for me is, no matter what powder you use you will have to make adjustments for temp swings. The question is how much. My 300 RUM will primarily be a hunting rifle and used in the Fall for general big game and the Spring for Spring Bear when temps will be mostly cool to cold.

The advantage to RL33 is it will fill your case better than Retumbo which will fill your case batter than H1000. And it will likey give you better velocities.
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  #11  
Old 09-03-2013, 07:35 AM
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Re: Retumbo or H50BMG in 32" 300 RUM?

rl17, ar comp, rl33, and rl50 are not swedish powders like the other rl series, they are swiss. I haven't had any more/ less trouble with rl powders in temp. swings than any other powder. You can't take the variations out of the barrel, primer, case, bullet, air density, and your shoulder (cold weather = more clothes and less resistance to recoil, hence less velocity) so I'm not so sure bothering to use a brand just because it is slightly more temp stable is worth my time.
I've loaded rl7, 15, 17, 19, 22, 25, 33, and 50 in the last year. My total Hodgdon choices are h4895 (which I'll replace with I 4895 when the h is out), h4350, superformance, and retumbo.
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Old 09-03-2013, 02:37 PM
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Re: Retumbo or H50BMG in 32" 300 RUM?

Quote:
Originally Posted by Lefty7mmstw View Post
rl17, ar comp, rl33, and rl50 are not swedish powders like the other rl series, they are swiss. I haven't had any more/ less trouble with rl powders in temp. swings than any other powder. You can't take the variations out of the barrel, primer, case, bullet, air density, and your shoulder (cold weather = more clothes and less resistance to recoil, hence less velocity) so I'm not so sure bothering to use a brand just because it is slightly more temp stable is worth my time.
I've loaded rl7, 15, 17, 19, 22, 25, 33, and 50 in the last year. My total Hodgdon choices are h4895 (which I'll replace with I 4895 when the h is out), h4350, superformance, and retumbo.
I'm sure RL33 is a great powder and I've heard good things about it's velocity potential. While there are a lot of variables I can't control very well as you mentioned, I choose to go with the least temp sensitive powder so that it's one less thing to cause a problem or have to account for. If down the road someone does some thorough, hard testing of the temperature sensitivity of RL33 and it proves to be comparable to Hodgdon Extreme powders, then you bet I'll try it. In fact I hope it does turn out to be temp insensitive because of the good things I've been hearing about velocity improvements over other powders.
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Old 09-04-2013, 10:43 PM
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Re: Retumbo or H50BMG in 32" 300 RUM?

Nothing wrong using 94gr Retumbo with good accuracy and velocity spreads if this is the case. I'll take Retumbo over a "slower burning faster bullet powder" anyday if my velocity spreads increase. I use Retumbo in my 300 Rum with the 230's and have great results. You may not gain an overall advantage changing to H50. However, if Retumbo isn't working by all means try a different powder.
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  #14  
Old 09-04-2013, 11:43 PM
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Re: Retumbo or H50BMG in 32" 300 RUM?

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Originally Posted by MMERSS View Post
Nothing wrong using 94gr Retumbo with good accuracy and velocity spreads if this is the case. I'll take Retumbo over a "slower burning faster bullet powder" anyday if my velocity spreads increase. I use Retumbo in my 300 Rum with the 230's and have great results. You may not gain an overall advantage changing to H50. However, if Retumbo isn't working by all means try a different powder.
Velocity spreads right now are my main concern. I have not had time to dive into serious load development yet. I just know where pressure starts. If it likes 93-93.5 grains of Retumbo then I'll be running somewhere around 3065-3100fps. As the barrel wears in I'm sure this will increase as someone previously posted. My goal is low ES and no more than .25MOA vertical spread. I should be able to get this weapon to shoot sub .5MOA. I'll keep posting updates as development continues.
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