I almost threw the towel in when the first started casting because of case position.
Shooting on the bench from bags with a Contender 30-30 and blue dot. Accuracy was acceptable, and I figured I just needed to tinker with it, loads were ok to shoot an up coming match for the time being.
Match day, chickens @ 50 all 10. Pigs @100, all 10 but group was vertical, top of back to belly line, figured it was me. Turkeys @ 150, big fat ZERO. Hits were any where from 3-4' low to that high! I tried to keep my cool for Rams @ 200. First five were the same vertical string issues but not near as bad. A light came on and for some reason powder position entered my head.
Now in Creedmoor position it can be some what of a challenge to keep the powder against the primer and get the gun closed back up with out tippling it down when loading. Got several of the last five but scattered all over.
I did a bit of tinkering and testing after that and the results were shocking to say the least. 1lb jug of blue dot with a hundred or so loads out of it. I gave it away a few years later.
Soured me on fast powders in large cases for a longgggg time. I use them on occasion but with a slanted eye.
I see a lot using them with good success. Happy for ya, but for me that is the last thing I want to think about is if I tipped gun or cars down or not.
After that I noticed how a gent was closing his TC. Pull trigger guard back, barrel tips down, extract, insert loaded round. Then he would snap his wrist to slam the barrel shut. I asked him about after a match. He said his load was position sensitive and closing that way flipped the powder back against the primer, must have because he shot clean a lot.
I got a look at his rig,frame and barrel was penned as I suspected pretty bad.