What load? Recommended by manual? By friend? Max according to the manual? Max loads are usually bullet specific and linked to a given COAL. Chamber pressure is, among other things, related to the available combustion chamber (free volume of the case under the bullet). Different bullet shapes are seated to different depth in the neck, even though the OAL would be the same. Recommended loads won´t necessarily become dangerous because of these minor differences, but the velocity very probably WILL differ from expectations. Take it as ballpark figures. Always start your powder weights low, work them up.
That said - if I have a tested load that I know is well below dangerous pressures in my rifle, I don´t have problems substituting different bullets of the same weight. Velocity usually ends up pretty close, accuracy differences are more a given of a different jump with substitute bullet´s shape.
