Think you can buy an 18 hole score of 70 in golf ??? The best clubs and balls in the world won't allow you to do that if you don't have the skill and practice relentlessly.
The clay games are maybe 85% "between your ears" ( skill, ability, concentration, technique et al) , 10% equipment and 5% everything else.
Learn good technique, acquire a decent & appropriate gun and get it to fit and balance properly, & become a student of the game. From that point on, lots and lots
of focussed practice ... not just burning ammo. Lessons and a decent coach can certainly help shorten the learning curve. Not every great shooter is a good teacher/coach and not every decent coach is necessarily a great shooter ! The advice offered by many squadmates, although well-intentioned, is neither necessarily constructive, productive ... or even correct.
Good guns in the $ 2500 - 3500 range can often be far better than the average shooter's ability. Many can handle the average Chevy, but few are able to get maximum performance out of a pricey Ferrari or Lamborghini. $ 15,000 or $ 20,000 spent on a high performance shotgun may not help you shoot any better ... you may even do worse if it doesn't fit as well as the old used $ 400 auto-loader you are currently using.
Some shooters will never accomplish 100 straights, regardless of the cost of their equipment and unlimited practice with the finest of ammunition.
Given good hand-eye coordination, nominal physical attributes, the ability to learn & concentrate, a decent gun that fits, and good coaching to teach proper technique etc.,
....with practice, the average guy/girl can however to learn to shoot very well.
A good gun and lots of practice with plenty of even decent quality ammo can get you a long way. Proper technique, good coaching and the ability to focus will get you even further. After 10,000 or so shells learning the game, maybe then you will be ready for that dream gun ... maybe not. Your level of dedication in between may determine
what level of skill you develop and how your performance improves ... not how much your gun & shells cost !