The rate of twist for a Remington 788 in .243cal is 1 in 9 which is one complete turn of the bullet in nine inches
1/14
What I have found is its 1-10" for 308.
1000$
Just paid $350 for 788 in 30-30 caliber.
$350.00
100-400 USD
I will first say that the Remington model 788 was made in 6mm from 1969-1979,at this time they are going for anywhere from 250-450 dollars depending on condition.
stocky stocks
$500-$600
Only Remington knows.
The Remington 788 model rifle was a great shooter in the few years that it was sold. A nice functional 788 in 22-250 should bring between $200 - $450 depending upon condition and any accessories (extra magazines, scope, mounts, etc. )