You're worrying about nothing. Shotgun reloading is not the same as pistol or rifle. If you can keep a + or - .2 grains you're doing really good. If you look at reloading manuals you see many loads go up and down 2, 3, or even 4 grains to get different velocities. My old 2006 Hodgdons manual doesn't show the 4100 wad, but all the loads with Clays have a 4 grain spread. At 5800psi you're at the low end. As suggested, take a file to the bushing. Even if you go a bit over you'd be perfectly safe and maybe better off. Try the next size larger bushing. I'd have to bet you'd still be under 7500psi.
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Paul Harm
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