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Are cci br2 primers a bad choice with Retumbo?

 
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  #1  
Old 01-19-2011, 12:22 PM
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Are cci br2 primers a bad choice with Retumbo?

Hi all,

New to this forum. I am loading 25-06 with Berger 115 vld's. I did everything I was told on this site as far as getting the right seating depth and so on.

My rifle likes (doing ocw test at 100 yards) 59.6 grains retumbo and a jump of 0.09. Accuracy has been pretty good at 0.4" to 0.5" but I am having a difficult time getting the velocity to be consistent. All of my ocw charges were all over the place, in some cases 90 fps between 3 shots. I also tried HSM's loading of the berger 115's and they vary by about 50 fps.

Chrono is an oehler 35-P. I did my test in mild conditions, temp was about 50 but very humid. Charges were weighed on 2 separate scales-RCBS chargemaster, then on a regular balance scale. All brass was virgin Nosler Custom neck sized on a redding competition die.

I realize these variations are not such a problem at 100 yards but at 600 it will be a different story. Do you think it's my choice of primer (cci br2)? Perhaps the primer isn't hot enough with a slow burner like retumbo? I was thinking of going to WLR primers, then maybe a magnum primer like a cci 250. Should I back off my load more than 1 grain when switching to WLR? I would probably start from scratch if I had to go to a magnum primer.

Any thoughts or advice?

jay
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Old 01-19-2011, 02:18 PM
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Re: Are cci br2 primers a bad choice with Retumbo?

I'm in no way an expert on the matter however, I will give you some ideas. I would not hesitate to try different powders. It is amazing just how different your results can be. I would also consider trying some different primers if you have them available. If going to a Magnum Primer from a standard, I would back off the load at least one to one and a half grains. The 25-06 does like slow burning powders but Retumbo may be just a little too slow. I would try something in the 4831 or R19 range. They are slow but not as slow as the Retumbo.
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Old 01-19-2011, 02:39 PM
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Re: Are cci br2 primers a bad choice with Retumbo?

My .25-06 shot decently with 115 grainers, Retumbo and magnum primers. However, when I switched to H4831SC and normal primers my groups tightened up considerably and became much more consistent. Each rifle is different, but a slightly faster powder improved things for me. H4831SC is my heavy bullet favorite in the .25-06. H4350 works amazingly with the lighter bullets.
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Old 01-19-2011, 03:45 PM
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Re: Are cci br2 primers a bad choice with Retumbo?

I am also thinking that Retumbo is maybe a little too slow for the 25-06.

I used 4831 in mine with very good results (115 -117 bullets), but even 4831 was a little too slow for 85 grain bullets in mine (26" barrel too).

Don't be afraid to try 4831, it's been the "go to" powder for 25-06 for many years.
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Old 01-19-2011, 04:59 PM
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Re: Are cci br2 primers a bad choice with Retumbo?

I also tried imr 4350 with similar results. I have 4831 on hand so I may try that. I am definitely trying wlr primers.
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Old 01-19-2011, 05:06 PM
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Re: Are cci br2 primers a bad choice with Retumbo?

i would try 210m primers with your retumbo load and wlrm. and then i would try 4831.
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Old 01-19-2011, 07:16 PM
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Re: Are cci br2 primers a bad choice with Retumbo?

I got an average velocity of 3044 fps and accuracy at .390" with the 115gn Bergers pushed by 51.0gn of RL22 and 9.5M (OAL: 2.7730"). Rifle was the SF Sendero. JohnnyK.
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