Re: 223 Remington vs 5.56x45mm reloading help
One thing everyone has not said is, powder type.
You allso need to know where the burn rate is at for the powder you intend to use.
That alone can cause majer presher diffrences.
I'll use my 300 winmag. for an example: I reload 150 gr green tip. on top of 71gr. of H414. now this is around 90% case capasaty. and does not couse any over presher ishues.
I started out loading 67.5 grns. at around 85% capacaty. was saposed to be the most acuret load for this combo. this load was cousing pierced primers and split brass necks.
Do to the burn rate of H414. it would couse extr presher do to the empty volume of space. So once again we get back to case cap.
So all in all you need to take into consideration not only case Cap.but burn rate of your powder being used aswell.
This is just my opinion on what I have exp. While reloading do to trial and errer.
Hope this helps thoughs wondering.
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