Clamp on SITES (not magnetic you'll loose them pronto) Tru Glo sites that are adjustable for windage and elevation are available to fit your Nova.
Just measure the thickness of your rib.

I used them on my Black Eagle for years.

Then as I always suggest use cheapy trap loads to fix your Point of Aim.
When you have your POI where you want then use a Turkey load.
1. As others said - being off from one shot to the next is because of "Flich".
You pulled the trigger rather than a gentle squeeze. You inadvertently jerked the gun pulling the trigger.

2. Why? Turkey loads are a magnum mixture of powder and shot and the resulting recoil hurts with multiple shots. This causes flinch.

3. Using trap loads is far cheaper on the wallet than expensive Turkey loads.

Before I dedicated a shotgun just for turkeys I'd take my sights off after season. I didnt like them for waterfowl or upland. There I used the Eagle as a shotgun and not a rifle.
We point a shotgun but aim a rifle.

For turkeys because of trying to hit a small target. That is the head, we aim! So it's more like a rifle as we use such a tight pattern.

Lift your head up off the stock just a fraction and you have a woofer and possibly a wounded bird you eont recover.
Using a good set of back and front sites forces you to keep your head down. Thus a better shot!



JW