Standard rifled barrels DON'T shoot slugs well HUH ? They DO & CAN shoot slugs VERY WELLPOLY barrels obviously are Not round and as such ANY projectile shot threw a poly profile must be forced into the shape of the barrel to pass down the barrels full length.A pellet that has minimal width at head and a thin hollow tail skirt EASILY shape shift to pass threw a poly profile .... SLUGS which are solid body projectiles must Shape Shift there entire length that is in contact with bores surface !!!This miens the lead must crush and displace itself for the slug to fit bore ... This takes away / absorbs a Large percentage of the total energy ( HPA ) that is being used to launch it. This has a Poly with slugs generally shooting slower IF IT WILL EVEN shoot a slug at all ? Many who have tried shooting slugs threw poly profiles need to set them up with a LEADE that allows some jump or the slug just sits there like a tight cork in a bottle.Also harder the lead is alloyed ... worse the situation becomes.This stated as a loose but general FYI ... there is a lot going on here and others if inclined will add content or debate whats been stated above.Scott S
perhaps for me the most important parameter the measures of the grooves and lands.