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RL-17 vs H4350 and temperature variance

 
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  #1  
Old 01-24-2013, 07:01 PM
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RL-17 vs H4350 and temperature variance

Ok so there is COMPLETELY conflicting information all over the internet about RL-17 and whether or not it is temperature stable. They claim it is, and some agree; however, many others do not. Most people who claim it is fairly variable with changing temperature agree that it changes about .8fps per 1 degree Fahrenheit of temperature change . I have also read that if you keep chamber pressures high (hot loads) then it stabilizes the powder. Can anyone confirm any of this? One last remark, if RL-17 is truly a temperature unstable powder, how much more so than H4350? Is it a big enough difference between the two powders to matter?

I am getting ready to receive a custom 260 with a 24" benchmark barrel with an 8.5" twist, if anyone is curious as to what this information will applied towards.
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Old 01-24-2013, 07:35 PM
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Re: RL-17 vs H4350 and temperature variance

I don't have specific data on Rel 17 but this may give you some guidance.
There is only one true line of powders that have a low temp sensitivity compared to the others. Some are fairly similar.
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Old 01-24-2013, 09:30 PM
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Re: RL-17 vs H4350 and temperature variance

If you throw in h4895 with it's 100 fps swings in my 25wssm between 20 degrees f and 90 degrees f and you've got a different ballgame. I put NO stock in the hodgdon temp. stability; I've seen otherwise with the few I do use. I'll play with Retumbo soon in a couple of my rifles and I do expect at least slightly better results as it isn't a revision of an older powder like some of the older Hodgdon flavors.
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Old 01-24-2013, 10:35 PM
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Re: RL-17 vs H4350 and temperature variance

their is a easy way to find out.. and I have done this with ALOT of powders.. once yo find a load.. make up 10 rounds.. put 5 in a cooler.. and shoot the other 5.. you will see if its temp stable or not.. I have never found a hogden powder that hs 200fps difference in temp enviornments. I have hunted colorado, montana and oregon in some cold and hot conditions and never had problems with h1000, retumbo, h4350 and h4821sc.. I recently just tried rl19 in my 270 wsm.. shot it the first day in 40 degree weather.. not bad accuacy and velocities.. shot same load 3 days later in 27 degrees and it was all over the place.. velocities varied up to 65 fps.. and accuracy went out the window!! some have said rl is nottemp sensitive at all and who knows...I have always had very good luck with the cooler trick.. just put some on ice for 20 minutes.. and shoot the others if you can in around 70-80 degree weather.. gunwerks uses hodgden powder for their ammo and it works great for 0 degres to 90.. just my 2 cents though!

kasey
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Old 01-24-2013, 10:54 PM
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Re: RL-17 vs H4350 and temperature variance

Quote:
Originally Posted by kaseyfied View Post
their is a easy way to find out.. and I have done this with ALOT of powders.. once yo find a load.. make up 10 rounds.. put 5 in a cooler.. and shoot the other 5.. you will see if its temp stable or not.. I have never found a hogden powder that hs 200fps difference in temp enviornments. I have hunted colorado, montana and oregon in some cold and hot conditions and never had problems with h1000, retumbo, h4350 and h4821sc.. I recently just tried rl19 in my 270 wsm.. shot it the first day in 40 degree weather.. not bad accuacy and velocities.. shot same load 3 days later in 27 degrees and it was all over the place.. velocities varied up to 65 fps.. and accuracy went out the window!! some have said rl is nottemp sensitive at all and who knows...I have always had very good luck with the cooler trick.. just put some on ice for 20 minutes.. and shoot the others if you can in around 70-80 degree weather.. gunwerks uses hodgden powder for their ammo and it works great for 0 degres to 90.. just my 2 cents though!

kasey
It seems some loads in the 270 wsm are flakey with rl19; my dad had that trouble years ago with his 270 wsm and even other powders didn't really cure its ills. He eventually traded the rifle. My 300 win varies less than 60 fps real world with rl22 and 165's, and is a solid 1/2 moa rifle at any temp. with it. Same story with my 300 rum and rl25 and rl50. Can't say for sure yet on rl33 but it looks promising. I think it's often a load right on the edge of being ballistically stable, ie. a bit cold or hot on the primer or a bit cold or hot on the pressures that kills the rl powders at times. At one temp. it's fine but you swing a bit and it gets buggy; I've seen it with 7828 and 140's in the 7rem too. At 60 f or warmer my 7rem loves 7828, but you cool down much and it goes from a 1/2 moa load to a 2 moa load. You have to prove your load in real world conditions and not hang your hat on a slogan.
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  #6  
Old 01-24-2013, 11:04 PM
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Re: RL-17 vs H4350 and temperature variance

TAG
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  #7  
Old 01-24-2013, 11:22 PM
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Re: RL-17 vs H4350 and temperature variance

S Well that load shot.344 at 250 yrds 5 trips to the range.. or better..the load was not flaky at all..
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