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RL33 Temperature Regression Thread

 
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  #15  
Old 02-15-2014, 07:57 AM
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Re: RL33 Temperature Regression Thread

Quote:
Originally Posted by Outlaw6.0 View Post
What kind of chrony are you using? I would bet your weird velocity stem therein.
It's an optical "shooting chrony" brand basic F1 model. It could have been the cause of the anomaly (is that spelled right?). Especially considering that the 1st shot did produce an error.

And 33 doesn't like bullet jump? With an overbore 7RUM, you NEED to have some, to keep the pressure from spiking.

I'm backing off on this thread now, as the OP probably thinks that I'm hell-bent on throwing it off course. He WAS pretty specific about the topic. Since 33 is what I am running now, I'm definitely interested in hearing what others have to say regarding it's possible temperature quirkiness. But judging by the responses so far, there doesn't seem to be enough info out there yet, due to it still being so fresh on the market. I'm hungry for ANY data & observations regarding this new powder.

Primer-blowing pressure spikes caused by LOW temps is unsettling. I really hope it turns out NOT to be the case, once a sufficient amount of data comes in. I've blown a couple of primers with [overly] hot loads of 22, in hot weather. But NEVER with 33 (or even 25, for that matter).
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  #16  
Old 02-17-2014, 12:21 PM
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Re: RL33 Temperature Regression Thread

Did some more testing last Friday and here are the results

6-284, 105 Hybrid targets over 60 gr RL33, 26" 5C Broughton (low pressure load)
Cold rounds were cold soaked in my freezer @ 5*. Then I transported them in a small cooler with an ice pack from the freezer. Temp in the cooler remained about 20* for about an hour prior to shooting, Warm loads were loaded at room temp of 70* then placed on floor of vehichle by the floor heater. The floor area remained about 80-85 for about 1 hr prior to shooting.

5 shots of each were fired

Cold rounds, 20*.... 3302, 3302, 3282, 3293, 3295.. Avg, 3295
Warm rounds, 80*.. 3322, 3311, 3313, 3304, 3302.. Avg 3310
Avg fps/degree diff, 0.25 fps/degree

Fairly consistent with the first test of this load.

Also tried the 6.5 WSM, 160 Matrix over 65.5 gr of RL33, 27" 5C Broughton barrel. Results were squirrely. The rifle was show pressure issues similar to previous when originally working up loads with my nitrded barrels.

Cold rounds, 20*....3084, 3132, 3119... Avg, 3112
Warm rounds, 80*..3134, 3097, 3099, 3113...Avg, 3111

Essentially no apparent affect. Like I said, the rifle was showing signs of weird pressure. This load was about 2 gr less than the original max working load I dtermined from ladder pressure testing. Cold rounds produced a medium heavy bolt lift and ejector marks. Warm rounds did not. I then proceeded to shoot some accuracy test rounds from 66 to 64.5. After firing 6 total rounds to get zeroed in with various charges of 65.5, 66, 65 and 6.45. I blew a primer with the 64.5 load, got the case stuck in the chamber and called it a day. All rounds showed pressure signs of heavy bolt lift and ejector marks. Ambient temp was 45.

Bottom line, I would not put a lot of faith in temp regression test with the 6.5 WSM rounds.

Results from the 6-284 are looking good. Still hope to do more testing and looking for anyone else who might have useful data to share.
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  #17  
Old 02-17-2014, 11:15 PM
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Re: RL33 Temperature Regression Thread

I load 103grns of RL33 behind the 300SMK in my edge. In the summer at temps around 80 to 90 my velocity is avg of 2996 and that is with a 7fps spread.
This winter with temps in the low 30s my velocity is running avg 2945 with a 15fps spread.
I have been shooting this powder for about a year now and like it because of the increased velocity I get out of it and the low spreads esp in the summer months and just deal with the difference due to temp

It also works very well in my 284 Rank, 4 fps spread and that is summer temps, haven't run it over my chronograph in the cold
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  #18  
Old 02-18-2014, 08:21 AM
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Re: RL33 Temperature Regression Thread

Quote:
Originally Posted by bassin93 View Post
I load 103grns of RL33 behind the 300SMK in my edge. In the summer at temps around 80 to 90 my velocity is avg of 2996 and that is with a 7fps spread.
This winter with temps in the low 30s my velocity is running avg 2945 with a 15fps spread.
I have been shooting this powder for about a year now and like it because of the increased velocity I get out of it and the low spreads esp in the summer months and just deal with the difference due to temp

It also works very well in my 284 Rank, 4 fps spread and that is summer temps, haven't run it over my chronograph in the cold
Thanks for the input Bassin. It looks like you are seeing about 1 fps per degree of temp.
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  #19  
Old 04-27-2014, 07:05 PM
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Re: RL33 Temperature Regression Thread

I picked up a couple of pounds of R33 and hope to get a consistent load out of my 27inch brux and some 180 hybrid bergers.
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  #20  
Old 04-28-2014, 09:39 AM
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Re: RL33 Temperature Regression Thread

I found 1/2 MOA load for 180vlds that runs 3140 fps with comfortable pressure in Winchester brass in my 7RM 28" bbl.
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  #21  
Old 04-28-2014, 10:18 AM
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Re: RL33 Temperature Regression Thread

Im getting 3/8 moa from 100 to 1300 yards with RL-33 in 338 lapua imp. with 28 inch bartlein barrel. 3025 fps average. Tight neck . 0 free bore. 105 gr of RL-33 , 5 th from rifling. My 10 shot ES was 13 with fireform loads and 10 fps with 1x lapua. Just like MontanaRifleman i experemented with temp. I put my rounds in refrigotor though. Tested with heat gun 40 degrees to 80 degrees, the inside of my truck rounds and found little difference in sensitivity! Actually the only diff i saw was the 80 degree rounds had 2fps ES over 10 shots. The average stayed at 3020 Fps. I have Neco PVM-21 chronograph so i fell that RL-33 in my expericane is very good for where i hunt in alabama. I may try putting some rounds in our deep frezze and chronoing them just for fun
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