FristLy I am not a qualified instructor. I am a competitor and I am biased toward trap so I can share what I know about trap.
My coaches are all Italian and they shoot from the core of the body. By that I mean the initiation of the whole movement which ever direction starts from the middle.
Your arms is a balancing ore and that’s it. The guiding force is from the body. Go to ISSF website and look at the Italian.
You will know what I mean. the majority of top trap shooters in the world and by that I mean the top 100 would have received training at some stage of their career in Italy. If you know what you are look for you can spot them miles away. Ask Cynthia, Susan and George Leary.
English shooter tend to use their arms a lot. This is very generalised and there is nothing wrong with that.
I have a great number of CURRENT great trap shooters in the 120’s from England and they manage some how but it comes down to ones control the 4 pressure points.
What do I mean by that
Butt
Grip
Cheek pressure
Foreend
Remember every single individual has a bias , right or left handed so there is an inbuilt advantage when moving towards that direction.
Can you see the disadvantages when using arms to control ones movement. ... I hope that’s QED
When you control your movement and initiate it from the centre you take away that bias.
More Problems now arises
When you teach a new shooter with no prior experience, this is easy. However if you try and precise that to a shooter with many years of bias and try to erase it out, it’s going to be a struggle. Most shooters I come across will try for a season and go back to their own ways because scores are not forthcoming.
This is why I say find a coach and put your faith in him or her and persevere. It will come but it takes time. No expectations .
There is just so much to share... I simply cannot put it all here without writing a book.
Lastly using your core to start the movement will need fitness. One simply do not see that walking around in shooting fields
Most people are simply unfit in their core muscles to shoot this way.
Again when the scores don’t come after a few weeks they give up
To conclude. Theses are the 2 styles in vogue at the moment.
I cannot comment on skeet because I do not compete in it.
Coming back to Canada, virtually nobody understands this at all. Anything goes at the moment.
Now shooting ata , angles are narrow and terminal velocities are low.
Scores are dropped usually because of psychological issues rather than technical issues.
When you start shooting 45 degree targets in Olympic then stock fitment will be different because of the stretch one needs.
Laterally you need 45 plus FOLLOW THROUGH (most people ignores that)
Vertically you need to reach 3m targets plus follow through.
Can you see where I am going ...
So what I would suggest is to get a stock fitted and then shoot competitions. Remember what I said previously, muscle tension in competitions are different when shooting with your mates.
I remember I got caught out in Kuwait and dropped scores when they start using pop up remote tv cameras on me. My tension increased and my stock just felt alien.
Experience counts, it will take years to be sensitive and understand what works for you and what does not. That’s where a good coach comes in.
Stock fitting is an art form and cannot be taught easily or done overnight.
I hope I have addressed what you are looking for.
Glad to share
Again I must stressed , I am not qualified to coach and I am not a coach. Just sharing what I know and that’s not a lot.