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That is the other thing about load data is you have to use the exact same components. For example a 300/221 cartridge loaded with a Sierra 150gr FMJ w/cannelure bullet is no where near the same OAL as a cartridge loaded with a Hornady 150gr FMJ w/cannelure bullet if both are crimped at the cannelure. The manufacurer determines where on the shank they cannelure it and military bullets are not always cannelured where commercial bullets are. This problem also effects pressure and velocity and is another reason you should start low and work up as in the above example the Hornady load is a higher pressure load than the Sierra because all of the shank is in the case. You might know this but thought it was kinda on topic. :)
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