Since steel does not deform, it has rather tight patterns as it is. I know some steel loads using buffer in them, and have opened a Remington steel load to find buffer in it, but I have no idea if it tightens the pattern or not. Some of the Hevi-Shot loads require buffer too, but again, I have no idea if it tightens the pattern or not. Hevi-Shot patterns tighter than steel as it is.
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