Why different powders for the same bullet grain? Solid vs jacketed Barnes in particular

[Marko]

Why do the reloading manuals show the use of totally different powders for the same bullet weight, but solid vs jacketed? Barnes 160gr in particular

Thanks
Mark

[catnthehat]

Quite often a particular powder that works for one bullet, say a FMJ, will not be compatible with a hollow point cup and core or mono metal hollow point because of the basic shape.
At times a faster or slower powder works better......
Cat

[Deer Hunter]

Solids usually take less powder for the same speed as a soft point, everything else being equal.

410 woodleigh solids shot to the same poi as 410 softs, but used 1.5 grains less powder. In a 416.

In my experience.

[Huntsman]

Is it not also because since the all copper bullets tend to be longer than the jacketed counterparts in order to make up for weight that they will generally need to be be seated deeper to allow proper cycling in most actions and magazine fit. Therefore since they need to be seated deeper the rise in pressure and the avoidance of pressure spikes, the same powders used for the jkt'd bullets should'nt be used.
Fortunately I shoot TC Pro-Hunters so case/ctg OAL isn't a concern.

[elkhunter11]

In many cases, I use the same powder for cup and core bullets, as I do for all copper bullets. The only way to know what will work, is to do some testing.

[Unregistered user]

Some bullets have more bearing surface, hence more friction/resistance to acceleration in the barrel than others. Load accordingly.