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Tried RL-33 in three different chamberings today

 
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  #1  
Old 10-06-2012, 02:25 PM
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Tried RL-33 in three different chamberings today

There is little data to reference at this point. Determined by comparisons and now by testing that RL-33 is slower than Retumbo for the 7 Rem Mag, 257 weatherby and 6mm-284.

With all three rifles didn't make any changes other than switching powder. Used the same brass, primers, bullets, seating depth, neck tension etc.

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7 Rem Mag: 24" Rem barrel, moly coated 162 A-max seated .010" into rifling.

Original load: 72 gr of Retumbo 2975 fps

RL-33:
starting load 76 gr vel 2837
Unfortunately the chrono had to be adjusted, shot without it till they had a ceasefire.
worked up to 79 gr for vel of 3000 for very small gain over Retumbo
80 grs showed a hint of lift and a small shiny spot on casehead.

I used a bullet seating comparitor and noticed that even with the use of a drop tube the powder was filling the case. 79 gr and up caused the OAL to lengthen over .010", enough so the bullet wouldn't fit into magazine.

I can see why Alliant only mentioned a load for the 175 gr bullet.
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257 Weatherby: 28" #5 fluted SS Lilja 3 groove barrel, moly coated 110 accubond, .015" off rifling.

Original load 75.5 gr of RL-25 vel 3615 fps

RL-33
starting load 76 gr for vel of 3318
jumped to 80 gr 3432 fps
81 gr 3525
82 gr 3559

No signs of pressure what so ever. There is still some room for powder, will be trying that in the future.
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6mm-284: 28" SS Bartlein 5R barrel 1 in 7.5 twist

Original load: 58 gr of Retumbo, 105 Berger target hybrid seated .065" off rifling vel 3307 fps

RL-33:
starting load 58 gr vel 3074
jumped to 61 grs vel 3274
62 grs vel 3335

No signs of pressure, believe can add more powder.
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Now for the most interesting part: I didn't pay much attention to the 7 mag as I shot at different targets. Afterwards I saw the POI was almost identical. Hmmm that's interesting I thought.

With the 257 Roy and the 6mm-284 I shot at the same target for each rifle. In both cases the bullets went to the same POI! The Roy made a nice 1/2" cluster at 100 yds. The 6mm-284 with one bullet lumbering along at 3074 and the upper end loads to 3335 shot a very tiny cluster with several in the exact same hole! In my 30 plus years of handloading I have never seen this happen. I would say one rifle doing this is just a rare event. To see three rifles do this, it isn't a coincidence.

I won't be shooting for several days. I want to continue with the 257 and the 6mm-284 to see what happens first, pressure or running out of powder space. I'll report back soon.
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Old 10-06-2012, 09:41 PM
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Re: Tried RL-33 in three different chamberings today

Thank you for sharing this information. Have looked at different reviews on RL-33 will give it a try in the near future......
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Old 10-07-2012, 04:58 PM
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Re: Tried RL-33 in three different chamberings today

10-7-2012 Continuing with RL-33:


257 Weatherby moly 110 accubond:



83 3625 which slightly faster than old load with RL-25
83.5 3674 fps shot well two shots were same velocity
84 gr 3704 fps shot well two shots were same velocity
84.5 gr 3735 slight signs of pressure on one case of four this is max case capacity with drop tube

This makes a 91 fps gain over a max load of RL-25



6mm-284 non moly Berger target hybrid

worked up to 64.5 gr which showed slight lift with very tiny shiny spot on case head from Rem 700's ejector hole. (This is with 8 times fired lapua brass)

62.5 gr 3376
63 gr 3414
63.5 gr 3453
64 gr 3485 fps excellent accuracy
64.5 gr 3535 a bit warm max case capacity using drop tube


Old velocity with Retumbo was 3307 which was the highest charge of powder without pressure issues. RL-33 yielded a 178 fps increase!




I will be replacing the 6mm-284 load if it continues to work well in the next few shooting sessions. Ditto for the 257.

I look forward to hearing on what others get with similar over bore cases like the 7 RUM, 257 STW, 6.5-300 weatherby, and many of Kirby's magnums.
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Old 10-08-2012, 07:07 PM
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Re: Tried RL-33 in three different chamberings today

Thank you for reporting on your work.
Semper Fi
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  #5  
Old 10-08-2012, 09:31 PM
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Re: Tried RL-33 in three different chamberings today

You are welcome. Glad to share what I have found. I waited a long time to try this powder. I think it can be stated as fact it is slower than Retumbo.

I hope some one with a 7 RUM can share soon.
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Old 10-08-2012, 10:12 PM
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Re: Tried RL-33 in three different chamberings today

I shoot a 6x284 with 30" 8" twist bbl. What primers ? I wonder if a magnum primer might help ? So should I start at 62grs pushing a 107 sierra MK ?
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Old 10-09-2012, 05:42 AM
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Re: Tried RL-33 in three different chamberings today

Summarizing all components: Berger 105 target hybrid, Lapua 6.5-284 brass and Fed 210 match primer. The OAL is 2.975" to fit and feed from Wyatt's mag box. Jump to rifling is .065"

I would think 60-62 gr for starting and work up to what your rifle prefers.

When I was researching this build I would save any information on the 6mm-284 in my documents. I just ran back throught the pages and never read of anyone using a mag primer.
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