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RL-17 vs H4350 and temperature variance

 
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  #29  
Old 01-27-2013, 08:36 PM
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Posts: 182
Re: RL-17 vs H4350 and temperature variance

I was a huge RL 17 fan. The velocitys were awsome. Gun shot great. Presures were fine. Then I show up at a May match with temps in 100s. Couldn't open my bolt and almost shot over a berm @ 750 yds. Took myself out of the match for safety. I will not shoot it ever again in my match rifle. I probably will in some of my hunting guns but not ever again in a match rifle. I am now shooting 4350 almost 100%.
My 2cents
Todd Conley
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  #30  
Old 01-28-2013, 08:12 AM
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Join Date: May 2012
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Re: RL-17 vs H4350 and temperature variance

Quote:
Originally Posted by toddconley View Post
I was a huge RL 17 fan. The velocitys were awsome. Gun shot great. Presures were fine. Then I show up at a May match with temps in 100s. Couldn't open my bolt and almost shot over a berm @ 750 yds. Took myself out of the match for safety. I will not shoot it ever again in my match rifle. I probably will in some of my hunting guns but not ever again in a match rifle. I am now shooting 4350 almost 100%.
My 2cents
Todd Conley
Some combo's will run 75 Kpsi without showing a hint of over pressure. I played with a strain guage on my last 7stw, and I was getting 58 Kpsi on one combo with rl25, but I went to 7828 and similar vel. and pressure signs were netting 70 Kpsi. A bit too much temp. would have gotten me a sticky bolt. You've got to either actually shoot in the highest temps expected or leave a bit of headroom for temperature.
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  #31  
Old 05-15-2014, 12:20 AM
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Join Date: Aug 2008
Location: Genola, Utah
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Re: RL-17 vs H4350 and temperature variance

Quote:
Originally Posted by toddconley View Post
I was a huge RL 17 fan. The velocitys were awsome. Gun shot great. Presures were fine. Then I show up at a May match with temps in 100s. Couldn't open my bolt and almost shot over a berm @ 750 yds. Took myself out of the match for safety. I will not shoot it ever again in my match rifle. I probably will in some of my hunting guns but not ever again in a match rifle. I am now shooting 4350 almost 100%.
My 2cents
Todd Conley
Todd, can you tell me the fps difference in your RL-17 and H4350 loads. I know its an old post but I would sure like to know what kind of velocity changes I can expect. I shoot a 6mm WSM wildcat, 95gr Berger VLD with 56gr of RL-17, 30" Bartlein barrel @3650 on a 70 degree day and the same load shot 3620 @50 degree's and lost its accuracy. Totally unacceptable.
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  #32  
Old 05-15-2014, 07:23 AM
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Join Date: Nov 2006
Posts: 182
Re: RL-17 vs H4350 and temperature variance

I have never owned a 6 wsm but I would think 4350 would be way too fast. 4831 may be too fast. I guess I would start with 4831 ssc then go to h1000 and maybe retumbo. That is an extreme overbore cartridge with along barrel. I am assuming the slower the better.
T
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  #33  
Old 05-15-2014, 07:51 AM
Edd Edd is offline
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Re: RL-17 vs H4350 and temperature variance

On a 6mm WSM, I would start with Retumbo and if my case got full before I got good velocity, I would switch to H1000. I'd be surprised if you can use a full case of H1000.
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  #34  
Old 06-03-2014, 10:27 PM
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Join Date: Oct 2006
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Re: RL-17 vs H4350 and temperature variance



This graph was produced for SH by Kombayotch.

Kombayotch, now a moderator of Canadian gunnutz, has replicated Hodgdon claims of temperature stability by taking a freezer and an oven to the range.
He heated and cooled the ammo and then measured the velocity of cold and hot ammo.

Me, myself:
I can work up to and get 3228 fps 130 gr 22" barrel 270 with long brass life by using Re17.
I would have bet big money that was not possible.
1) But the temperature variations in Re17 would require such a big safety margin that I would be back down to the performance of many other powders.
2) Further, the temp variations are not good for first shots at long range [hunting, not targets with spotters].

Right now I am a big fan of H4350, because of temp stability.
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  #35  
Old 06-04-2014, 11:42 PM
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Join Date: Dec 2008
Location: Grantsville Utah
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Re: RL-17 vs H4350 and temperature variance

I have had very good velocity and accuracy with RL17 but have found it to be QUITE temp sensitive. The best two powders I've used are H1000 and Retumbo for being consistent........Rich
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