melanie wrote:Hi guys,
Reloader on my L plates here.
So 2 questions.
1) You could seat the same bullet higher or lower making it even more compressed.
2) Two different length bullets could be used with the same maximum 'compressed' load but the longer one would compress it more again.
This doesn't seem to be addressed in the load data?
So is it lowest common denominator and will work with all deeply seated long bullets? Or what else?
It is addressed in the ADI data, with the 308 using 110-125 gr projectiles you will find most loads are compressed at maximum loads, the 125 gr lists 2 different projectiles with 2 different max loads both are compressed. (8208)
I also look at pressures when considering max loads, the 308 with 110-125 gr is around 50,000 psi with max loads which is below the 60,000 psi used for some other max loads, my .243 usually has pressures around 50,000 psi with start loads up to 60,000 psi max.
Seating the projectiles higher can give more room in the case, the magazine is what usually restricts how long they can be if using a magazine, I don't know why you would want to seat them lower.
The whole point to load development is to find something that works well for accuracy,when the bullet goes bang there are all sorts of vibrations and harmonics happening in milliseconds, the harmonics of your gun are what they are and not much you can do about that, load development is about matching the harmonics of the gun to the harmonics of the bullet going bang to get the best accuracy, by altering powder loads you are altering the harmonics of the explosion,by experimenting with loads you will discover one that gives superior accuracy over others.
Those with .22lr don't reload so they change ammo brands to find out which one works best to match harmonics of gun to harmonics of explosion, with a centrefire and reloading you can tailor it to suit your gun.
With my .243 the most accurate loads for 55gr are mid loads around 3700 fps,i could push them faster but accuracy falls off so I don't bother, the lower pressures from mid loads might help the barrel last longer.
Start near minimum loads and work up in .2 gr batches till you find the load with best accuracy which is what you are trying to find.