Sp vs Hp Bullets For Coyotes

Originally Posted By: AWSCorrect, it is equivalent to a 222 Rem. Mag. IMPROVED. Nice wildcat, readily available brass, a little more capacity than a 223 AI, off the shelf dies and no fireforming.

So factory 222 mag ammo can be shot out of the 22-204??? Dan
 
No. It is Improved not Ackley Improved, the 204 Ruger shoulder is moved forward so you would have excessive headspace if you used 222 Rem Mag brass without creating a false shoulder to headspace on. That's why I Capitalize IMPROVED to differentiate from Ackley Improved.

There were many different shooters Improving/wildcatting cartridges, Gibbs, Mashburn, Kilbourne, Gibson,Donaldson and the list goes on a long way, including myself(I built the first 25-204 the year 204 Brass became available, inspired by the 257 Kimber). Most did not create cartridges that the parent case could be simply fired in the improved chamber to form the new case.
 
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