I have a Stevens 200 in .223 and two AR15 rifles, the throat on my Stevens 200 appears to be slightly longer than the throats on my two AR15 rifles. I tested this by just bumping a case in a neck sizing die so the neck would just hold a bullet but allow it to move with a little force. I chambered this test round in all three rifles and measured the OAL of the test cartridge.
If the Stevens 200 had a standard SAAMI .223 throat the AR15 throats should be twice as long as the Stevens 200 but it was not.
My tests are shade tree mechanic tests and there are specific gauges made for proper testing of the throat. The reason I say this is you have throat diameter, throat angle and throat length on the various type .223/5.56 chamberings. Also Savage has .223 rifles with the following twist rates, 1 in 14, 1 in 10, 1 in 9 and 1 in 7 and I assume the throat lengths vary for the use of heavier and longer bullets.
Read info below.
223 vs 5.56
http://www.savageshooters.com/showth...39-223-vs-5-56
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