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RIO primers

Discussion in 'Uncategorized Threads' started by jbmOU, Jun 13, 2007.

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  1. jbmOU

    jbmOU Member

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    I just picked up a case of RIO primers. What primer can these be substituted for? What is a good load using STS hulls, RIO primers, Promo powder, and a WT12 wad? thanks, jamie
     
  2. Big Al 29

    Big Al 29 TS Member

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    Fed 209A is the closest.

    Check the threads as I just posted a similar question.

    I have been using 17.5 grains of Promo with the RIO primer pushing 1-1/8 of shot.

    I like it but I too posted if its ok to bump it up to 18.3 as that would be my #33 bushing in my MEC 9000.
     
  3. johnpe

    johnpe Member

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    Do a Google search. I found a page of loading data a couple of days ago for Rio primers with Federal, Remington and Winchester cases. It isn't a lot of data, but it is a start.
     
  4. Quack Shot

    Quack Shot Active Member

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    Mash the link above for some data directly from RIO. As much as it pains me to admit, I'll have to agree with Big Al 29. The RIO G-600 primer appears to be about as hot as the Federal 209A. They are also a few thousandths of an inch larger than the standard 209 primers. You will find a little more effort is required when seating these primers and you will most likely be unable to use a standard 209 primer again in the hulls that you use the RIOs in.

    I would be careful about an across the board statement of them being an exact equivalent of something else, since you have no way of knowing exactly how a load will react when swapping components. Pressures can increase, decrease, or stay the same. It's most probable that pressures will be higher in loads using the RIO primer, but by how much one can't say without testing them. I would stay well below the maximum loads listed for the Federal 209A and go with caution. You might try to contact the powder manufacturer (Alliant) to see if they have any data to offer. They appear to have a good deal of data for Promo that has not been published. It has been my impression that these primers develop some fairly high pressures with Red Dot. Promo is similar, so a bit of caution would be a good thing.
     
  5. SShooterZ

    SShooterZ Member

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    They're hot!

    Here's some additional data.

    Stay with Fed209A data and you should be OK as long as you're not pushing the envelope.
     
  6. johnpe

    johnpe Member

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    The link to the Rio ammo site given by Quack Shot will give you the same page of reloading data I got using Google.
     
  7. FarmerD

    FarmerD TS Member

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    Through chonographing I have found that they are slightly cooler than the FED 209A and not a consistent. They are a good primer in cold weather. Over sized and hot.

    Gun Club - 17.4 Promo - RIO - WJII - 1 oz. # 8 1/2 Vel. 1253
    Win AA (HS) - 17.4 Promo - RIO - WJII - 1 oz. # 8 1/2 Vel 1273

    Not recommending these loads just for your information. Shot across a CED Millennium Chronograph Richard
     
  8. Quack Shot

    Quack Shot Active Member

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    BLKLAB

    You can't really tell what the pressure is from the velocity. You can most certainly have a higher pressure at a lower velocity. The only way to tell is to test the load for "pressure". They don't always correspond, especially if you are testing different components, as we have discussed here.
     
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