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RL-22 The Slow Burn

 
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  #1  
Old 10-22-2008, 09:44 PM
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RL-22 The Slow Burn

I've been working with the Hornady 162 Amax & RL-22. The Hornady Manual lists 62.9 gr. as max and yielding 3,000 fps. I used 61 gr. as a starting load in W-W brass sparked with a F215 primer. Pressure was mild and so was velocity (2488 fps) from my 24" bbl. I worked up to 64 gr. in one gr. increments and achieved 2639 fps, still no pressure signs. My next range session took it up to 67.5 gr., still no pressure signs and velocity was just 2772 fps.

I had previously worked with AA-Magpro with this same brass and primer and bullet. A charge of 76 gr. yielded 3052 fps, which seemed to be about maximum in this rifle.

Is this lot of RL-22 a super slow burning lot? Obviously when I start with a new lot I'll have to cut the charge way back. Scratching my head here.

Festus
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  #2  
Old 10-22-2008, 09:49 PM
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Re: RL-22 The Slow Burn

Sorry, forgot to mention it's a 7mm Rem Mag.

Festus
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  #3  
Old 10-22-2008, 10:03 PM
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Re: RL-22 The Slow Burn

I've read on this forum and others that the federal primers are somewhat mild to begin with. So, maybe you're not getting sufficient ignition? Try a hotter primer like winchester WLRM?

Besides that, try re-calibrating your scale. Maybe you're not throwing what you expected?

Others may have more insight...

Last edited by loaders_loft; 10-22-2008 at 10:06 PM.
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  #4  
Old 10-23-2008, 02:11 AM
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Re: RL-22 The Slow Burn

Thanks, LL,

But all charges are weighed so I think I need to look beyond a primer switch to account for a 500 fps velocity deficit. Double base powders are not typically difficult to ignite but I admit to being baffled.

Festus
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  #5  
Old 10-23-2008, 06:25 AM
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Re: RL-22 The Slow Burn

RL22 is well known for lot to lot variance. Sometimes to the extreme. They had a major recall a couple years ago on one lot because of that.

That is why I never use RL22. Ends up constant load development unless you buy a bunch of the same lot. Just too many other good powders out there that do not have that extreme variance.

At least that is my experience based on many problems with RL22.

BH
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  #6  
Old 10-23-2008, 10:58 AM
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Re: RL-22 The Slow Burn

Are you sure you're getting good chronograph readings? Did you shoot a known load through it to verify? Also, did you mic. and/or weigh the bullets to make sure they're what they're supposed to be. Just trying to throw some things out there for ya'.

I know there have been reports of RL22 varying from lot to lot, but I don't think I've heard of a situation quite like yours.

A few years ago I bought a couple pounds of the recalled lot, the lot that was way too hot. A call to Alliant got me two replacement canisters, quickly I might add, so I was satisfied.

Over the years RL22 has served me well. If you go to the websites of various 1000 yard benchrest clubs (Iowa, N. Carolina, etc..) and review their match results, you'll probably find that RL22 and RL25 account for the vast majority of winners. I accumulated some data a couple of years ago on this and that was my findings.

Anyway, hope you get it figured out. Try giving Alliant a call.

Last edited by Delta Hunter; 10-23-2008 at 02:39 PM.
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  #7  
Old 10-23-2008, 04:09 PM
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Re: RL-22 The Slow Burn

Thanks for the insight guys. I was aware of the lot to lot variation reputation that RL-22 has but I've never had results like this. My chronograph is fine but I have not measured the bullets. I doubt that is the trouble though because bullets from the same box produced expected velocities with AA-Magpro. I'll see what I can learn from Alliant.

Festus
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