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The OGW or Optimal Game Weight column is based on an article in a Lyman loading manual a few years back. What it really is momentum multiplied by energy divided by a factor. No real scientific justification but it produces numbers that are intuitively correct. It does produce some questionable results for very fast light bulets in my opinion but overall it might help a novice avoid shooting a griz with .243.
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questionable results for very fast light bulets
Yes, you're exactly right on that.
It's less than scientific, it's totally bogus. Using conservation of energy and momemtum, you can trivally compute how much energy is use to deform tissue. This only holds true if there is no exit wound ( ha ha ha ) -
Shooting a griz with a .243 you would probably not have an exit wound, and almost all of the KE would go to tissue breakdown. Hit a bear with a 500lb club having the same momentum might wake him up but it clearly wouldn't bruse the bruin.
I suppose it's better than nothing.
The Taylor Index - A Measure of Stopping Power