505 Gibbs project

Whya505?

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So I acquired a CZ550 that was built by GA Precision as a 500 Battleship, Apparently a Rigby cut off around the shoulder and necked for a .510 projectile. I am have that rechambered to 505 Gibbs and am looking at doing some odd ball experimenting. Does anyone know of anyone that has worked up or QL-ed 750Gr Amax in the cavernous gibbs? I have an actual .505 Barrel to thread and chamber as well that was will go on it later in life.
 
I do not as the biggest I’ve seen is the 600 grain work up. Tagging this thread to stay informed.
 

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Do you still have the Ruger 9.3x62?
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flying to Denver in an hour! is it to early to hit the bar:)
FIXING TO HEAD TO DALLAS FOR TEXAS TROPHY NEXT WEEK YALL COME SEE THE EVENT.
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Hi. Will you take $90 including shipping for the 28 Nosler brass?

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