7%??? now 10% - Gads!

Can you believe the stupidity? One would have thought such air-heads would have been removed from the gene pool eons ago.

Overloading with BP is virtually impossible to do in any case, unless the wrong grannulation is used - BUT with care, changing granulations can work in proof as can compression amounts - witness the .303's first loading, velocities and presssures generated - 70gr.

of BP powder in a 45gr. case. But smokeless - 10% -

Good Lord! They will create bombs - not get their 20% or whatever increase in pressure, but double pressure depending on the ctgs. Such are smokeless powders today. Oh well, glad this doesn't happen here.

Bordhunter50 - As to shortening cases to allow crimping bullets with cannelures in the wrong place - sometimes mandated by heavier than normal bullets, sometimes by merely having a bullet with a wrongly placed cannelure for a particualr repeating action - is normal handloading practise - in itself is not a bad thing - but not knowing what one is about with handloading IS a bad thing. .444 Marlins typically have 38" twists and will not stabilize bullets much heavier than 310gr. Those Marlins have a working pressure limit of about 44,000PSI and at that pressure limit, using the correct powder, can achieve 2,100+fps with that bullet, 2,200fps with a 300gr. To load at the limits in any ctg. one must know what one is doing.
Most don't. Witness the new English Proof Rules! 10% more powder --

BTW - Marlin themselves tested a M1895 .45/70 to 70,000psi, the bolt opened normally and the case fell from the chamber, indicating no excessive bolt thrust nor pressure exceeding the elasticity of the 'new' brass.