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You are correct One of my customers is getting pass throughs on pigs at 100 metres with the .430" 280grn FP loaded to 900fps
the herds a American Bison were wiped out with soft lead bullets with a...

make sure they are .001" to .002" over groove diameter and don't try to run them too fast go for accuracy not velocity my 151grn HP will expand at 900fps
to about .400"

Soft cast bullets will shoot ok no need for real hard lead even straight wheel weights are too hard for hunting bullets if you want expansion
bullet fit to barrel is the most important the fatter...

I have some 280 grain FP gas checked .430" for sale on TM or you can buy direct 50 at $15.00 100 at $30.00 plus freight also available are 270 and 260 grain HP's