- Joined
- Apr 29, 2023
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@pods8 (Rugged Stitching),
Did you say the 4 rd 223 mags allow a COAL of 2.55”?
Did you say the 4 rd 223 mags allow a COAL of 2.55”?
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That length dummy round +/- 10 thou or so will fit with minimal clearance in the current prints. The material shrinks a little when its annealed (initially 2.575" fits). Maybe to be conservative we say 2.5" which easily fits.@pods8 (Rugged Stitching),
Did you say the 4 rd 223 mags allow a COAL of 2.55”?
I think 2.55” is good. I had some freebore added to my barrel. I had around 75 thou added if I measured correctly. But with a 75 ELD I think my COAL is right around 2.5”That length dummy round +/- 10 thou or so will fit with minimal clearance in the current prints. The material shrinks a little when its annealed (initially 2.575" fits). Maybe to be conservative we say 2.5" which easily fits.
I've been using 75eldm for the dummy rounds and I can't close the bolt on my gun on a round 2.55" (or 2.575") long, I can run the bolt to strip the round out of the mag and push it until it hits the lands then pull it back. In my gun 2.48" is the longest I can close the bolt on with the 75eldm, at that length I can cycle dummy rounds through mags easily / quickly / slowly / with green eggs and ham.
Is there a need for something longer?
The 75s aren't held in by much when I'm making those longer dummy rounds, I think at 2.55" the bearing surface is seated in less than half the neck length.I think 2.55” is good. I had some freebore added to my barrel. I had around 75 thou added if I measured correctly. But with a 75 ELD I think my COAL is right around 2.5”
I want to say I’m right close to 2.5”. The reason I don’t know for sure is that I’m wrapping up building a house for myself and my reloading setup is packed up. I do know that my CBTO using the Hornady comparator is 1.983” when listing at 20 thou off the lands.The 75s aren't held in by much when I'm making those longer dummy rounds, I think at 2.55" the bearing surface is seated in less than half the neck length.