24" 338 Lapua: RL33 to slow for 300gr EH?

domestique

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Mar 6, 2013
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Hello,

Obviously the powder shortage is in full swing, and I cannot find any H1000, RL25/26 or Retumbo.

Would RL33 be ok in a 24" barrel. I was originally going to load 270gr ELD-X, but figured the 300gr EH bullet would benefit from the slower burn rate of RL33.

QuickLoad is showing 99% burn in a 24" barrel. I will be using a TBAC suppressor most of the time, and worry about too much unburnt powder causing excessive wear and tear.

Thank you!
 

domestique

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Mar 6, 2013
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Interestingly enough, the published book data for RL33 uses a 24" test barrel (which I believe is SAAMI spec for 338 Lapua), and Ramshot uses a 28" barrel.
 

North Idaho Hunter

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Nov 14, 2013
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I’ve done a lot of development with r33 and 338
improved cartridges. Testing showed no real velocity improvement in 28 inch barrels vs 26.

surprisignly only 25-35 FPS gain with 28’s vs traditional 26” barrels.

I would bet you would be just fine running r33 in a 24”.

Bullets used were 285 eldm and 300 gr. Vld.
 
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domestique

Member
Joined
Mar 6, 2013
Messages
6
I’ve done a lot of development with r33 and 338
improved cartridges. Testing showed no real velocity improvement in 28 inch barrels vs 26.

surprisignky only 25-35 FPS gain with 28’s vs traditional 26” barrels.

I would bet you would be just fine running r33 in a 24”.

Bullets used were 285 eldm and 300 gr. Vld.
I wasn't able to get a keg of RL33, it would have just been 1 pound bottles. Not knowing if all the RL33 would have been from the same LOT, I ended up buying a 8 pound keg of LRT.

Worst case scenario, the 338 hates the LRT, and I will use it in a RUM instead.

I really wish there would still be a retailer that would allow powder backorders. I don't mind waiting the 20+ weeks it will probably take, as long as I know it is eventually coming.
 

BHP9

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Dec 4, 2007
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Ontario, Canada
When I loaded .338LM my preferred powder was Retumbo with the 300gr Sierra's.

Tried H1000, RL33 and found them not as accurate nor consistent.

My bad, it was RL25 not RL33 - should have looked at my records.
 
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Flintlock shooter

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May 2, 2018
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Spokane WA
I have had good luck with RL-25 in one of my 338LM's. You may want to try it if you can find some. I use 300gr SMK's and CCI 250's.
 

Chamberman

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Mar 23, 2012
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Caldwell, Idaho
N565 will work very well. Try powder valley, bruno shooter supply, midsouth shooters supply, graf and sons.
Bruno shooter supply actually has one pounders as I am writing this...............
 

codyadams

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Jan 7, 2015
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Southwest Wyoming
Your ql showed 99% burn rate, so that kind of settles that. As far as velocity goes, I have found that the powder that gives the best velocity with a long barrel, still generally gives the best velocity with a shorter barrel. I'm running a 24" .338 Norma Mag, and I have tried IMR7828ssc, H1000, Retumbo, Reloder 26, VV N-570, and have some RL33 I may eventually try. Best velocities were with N-570 and Retumbo, the two slowest of all of them.
 

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