Beer mats sizzle and suck up the lube then go quite hard , if you are loading cartridges the basic formula for accuracy is the bullet should just touch the rifling , the powder should fill the case behind the bullet , use wads, to fill the air gap, a couple of milk carton wads under the bullet to protect its base -then beermats or cork or engineering felt - to soften the residue and fill the gap then a plain card over powder wad to protect the powder , use a magnum primer, drop the powder into the case down an alloy tube at least 60cm long , I use a Lyman BP powder thrower with an extension tube .this lets the granuels settle in nice and snuggly
Try filling the cavity in the back of the Minie ball on the 58 with lube
What case are you using for the 28ga , is it a rifle?
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