I would try to take every shot like it's your first shot. Do the same routine before every shot and try waiting 2-3min in between. Competition shooting is all about consistency between shots. When shooting groups you need to think this way. Usually vertical stringing has to do with breathing.

I know I'm saying this without knowing your experience, but just trying to say apply all the fundamentals for every shot. If you are the least bit uncomfortable it will throw off that shot.

Another thought is that you mentioned you had a couple different brands of projectiles. Do you have them in separated from each other to ensure you aren't firing a nosler for 2 shots then a berger on the 3rd? If not separate and label everything, so that there is less thinking to do on the firing line.

I have not started reloading yet myself, but have shot for score in the Corps numerous times. The inconsistencies in everything you do leading to each shot beats a lot of good shooters.

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