429 drops right thru all but 2 cylinders on my SBH. Those 2 I can just flick my wrist and they drop out.
430 takes significant pressure to get thru any of them. (My sizer leaves some spots 4304)
My barrel slugs at 429 when I pushed all the way thru it.
Should I uniform my cylinders at 430? Is that something any machinist could handle, or a gunsmith would be better?
Thanks