well,,,
when you change from 255 to 250grain at 20 yards,
you probibly should send the gun back to the manufacturer to ,,,
get the barrel re_courved for the new point of impact...
A gun smith is not qualified to preform this super secret re_ curving of barrels.
the point of aim must be done in a vapor chambor that only big manufacturers have acsess too..
you will be enertained by the cost of re_courvering your barrel.
lol lol lol