Question about the 50 BMG case size

Any of you guys know the diameter of the case head and at the shoulder?

I'm tryiong to figure out a formula so all info would be great

[Dave King]

I don't have the exact measurements but I know it's just a big 30-06 case. 5/3rd's a 30-06. I was looking for a 4/3rd's 30-06 case several years back for a wildcat I was thinking on and came across the 505 Gibbs case (needs necked down to be a true 4/3rd's) followed immediately by the 408 CheyTac.

[kidcoltoutlaw]

i have one i will check and get back with you on it.its at my reloading cabin,thanks,keith

The case head = 0.804" (Handloader mag)
The shoulder = 0.714" (Handloader mag)

The reference to the BMG size by proportion is 144% larger than the 30-06 Springfield.

Regards.

[kidcoltoutlaw]

the case i checked was .800 and .710

[Fiftydriver]

My PMC match prepped brass that has been once fired and neck sized measures:

Rim: 0.801"

Head: 0.798"

Shoulder: 0.715"

Milsurplus will vary much more then PMC or IMI brass which is why I use this for my extreme range match loads in the 50 BMG.

Good Shooting!!!

Kirby Allen(50)