Re: No more turret adj. at 100yrds
About the cheapest cure is a set of Burris Signature rings with the inserts, around $35-$40
Another option is a tapered base to put your current rings on, these can run up to a couple hundred dollars, but there are some under $100 (I think not sure about a 7400). I use the Burris rings myself.
Ignorance can be treated with education, sadly there is no cure for stupidity.