Winchester 80gr factory is my standard as I got given a ton of it hence why I baught a 243
Iv tried handloads too they end up working at book stated velocities I just tend to go for faster end of the powder scale.
I think my barrels are 18.5inches from the action so probably less than 18 inches once you subtract the bullet length
Kills well, with factory soft point so I'll run it till I run out
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