Thanks Tripple Seven the way the word it is a little confusing.
From owners manual
"Always follow recommended loading data when selecting bullet type
and weight. When using saboted bullets and pelletized powder, maxi-mum
bullet weight should not exceed 300 grains. With loose powder
loads, conical lead bullets should never exceed 400 grains. Heavier
bullets may produce dangerously high pressure levels, possibly result-ing
in explosion of the gun and severe injury to the shooter and by-standers."