zetor said:
.....The only thing not to be taken too seriously in the reloading manuals is brand recommendations. All manuals provide good basic info and data but push "THEIR" products. .....
Uh, that is a big "NO!" Do not make substitutions! Especially as a beginner!
I have experienced many pressure variations with simply using different primers! If a certain loading uses a certain primer, do not substitute without working up that load from the mid-range. Pressures can vary IMMENSELY from one primer brand to another, as well as one company's lot to lot!
Different manufacturers of brass can have drastically different internal volumes from head thicknesses and wall thicknesses. This can be the difference in just a little pressure, or compressing the powder and wildly increasing chamber pressures!
Further, you cannot simply change a bullet from brand to brand either, without making sure the bullet is of a similar constrution. Using lead loads with jacketed and vice versa, can be disasterous. Using a solid copper where a gilding metal jacketed lead can be as well. Using a steel core where a lead core is the load, is just a big scream "NOOooooo!" from my experience. Further, the diameter and thickness of the jacket... Contact surface and ogive can cause wild variations in pressures using the same data. The list goes on.
PLEASE, NEVER substitute components unless you really, really, REALLY know what you are doing and have the ability to recognize excess pressure!