Before you do anything else, please shoot some FACTORY ammo.
If it doesn't "do it" with factory ammo, but it does do it with your handloads, you have discovered your problem.
Also, I'm not convinced that you have clean cylinders. If the cylinders are badly fouled, the fouling may be causing the ass-end of the rounds to protrude and drag against the recoil shield.
Get a Lewis Lead Remover kit and go to town on those dirty cylinders.
I have one, and it works great.
Elbow grease not included.
Best part of the Lewis Lead Remover is that ceasing shooting handloaded plain-lead bullets, and instead shooting only jacketed bullets, completely eliminated the need for me to use the Lewis Lead Remover to fight the problems caused by shooting plain-lead bullets.
Click the "Missouri Bullet Company" link
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Missouri Bullet Company offers premium lead bullets at affordable prices. We make hardness optimized bullets for the velocity of the loads you shoot.