IMR 4320 with CCI 250 LRM primers

[BRD51]

If I worked up a load using IMR 4320 and CCI 200 primers can I safely use the same load if I switch to CCI 250 Large Rifle Primers. I am not at max powder for the .308 load. If this were a .223 I would have no issues switching to CCI 450 primers on a load I had worked up with CCI 400 primers.

[Dane Armory]

Back off 0.5 gr to 1.0 gr and work your way back up 0.1 gr at a time.

[planeflyer21]

/\/\/\/\ Yup.

 

Did the same thing with the Winchester LP Magnum primers when there were ZERO other types of primers available.  

[mineralman55]

If I worked up a load using IMR 4320 and CCI 200 primers can I safely use the same load if I switch to CCI 250 Large Rifle Primers. I am not at max powder for the .308 load. If this were a .223 I would have no issues switching to CCI 450 primers on a load I had worked up with CCI 400 primers.

Out of curiosity, are you using this in an AR308? IMR4320 is a little on the slow side of the spectrum, but I'm always interested in how different powders perform in our rifles. How is the accuracy? Cycling action? Etc.

[BRD51]

IMR 4320 is my most accurate powder out of a LR308 18.5" barrel. I use 44.7g with a 168g bthp and CCI 200 primers and it cycles fine. It is more accurate than IMR 4895, blc2, or Win 748 of the other powders I have tried. I don't know about velocity as I have not used a chrony on this load yet. I only shoot paper at 100 yards so I don't care about velocity that much. As long as it cycles fine, and is accurate, I am gtg. At some time in the past year, I loaded 18 rounds with CCI 250 primers but I don't know which 18 rounds I loaded. That is my concern. I don't recall even purchasing these primers. I must have been so overjoyed at finding large rifle primers that I didn't see the CCI 250, only the Large Rifle Primers designation.