Fireforming question 220 Russian to 6.5 grendel

[mao0720]

Looking for some advice on fireforming 220 Russian to 6.5 grendel. I’m looking for any advice on how to fireform without bullets. What powder should I use, and how much of it (with or without cream of wheat)? Any other advice or helpful hints would be greatly appreciated. Thank you!

 

[jobhopper66]

Are 220 Russian cases even long enough to become 6.5 Grendel cases?

 

[mao0720]

Case length for both is listed at 1.52. It will shorten a little when necking up, but should not be an issue.

 

[jobhopper66]

My mistake Sir. I was thinking the Grendel had a significant length advantage over the 220 Russian case.

 

[457ciSBC]

Case length for both is listed at 1.52. It will shorten a little when necking up, but should not be an issue.

It’s more than just the decreasing case length as a result from necking up; brass obviously will be displaced to fill out the body and the shoulder, it’s basically a .075 taller 6.5 PPC and material has to come from somewhere other than the case head.......”shorten a little“ will be relative.

Google fire forming 6PPC

 

[mao0720]

It’s more than just the decreasing case length as a result from necking up; brass obviously will be displaced to fill out the body and the shoulder, it’s basically a .075 taller 6.5 PPC and material has to come from somewhere other than the case head.......”shorten a little“ will be relative.

Google fire forming 6PPC

Right, compared to 6ppc the shoulder is moved forward more. That should not stretch brass anymore than fire-forming to 6ppc. I’ve read quite a bit on fire-forming 6ppc, I just wasn’t sure if I should adjust charges for forming 6.5 grendel.

 

[mao0720]

I also have a 6mmAR so I may firearm them to that instead. Any suggestions on where to start as far as a firearm load?