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RIO primers

1K views 7 replies 6 participants last post by  Quack Shot 
#1 ·
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
 
#4 ·
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.
 
#7 ·
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 ·
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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