The Spainish have been making guns for many hundreds of years and they have some of the most up to date manufacturing facilities in the world.
Not to mention they made and still makesome of the finest swords a person could get in Europe. They know how to work steel.
Another thing to consider is the sue happy times we live in. No manufacturer is going to recommend a dangerous load for the guns they make or, as soon as someone got hurt,lawyers would be all over it like a June bug in a chicken coop.
Don't exceed the max recommended powder load/bullet weight.