spitballer
Member
I would like to know if anyone else has had a bullet slow down when the powder charge is increased. This really blew my mind when I saw the figures.
Equipment: .223 bolt action Rem 700, Nosler cases, CCI#400 primers, Nosler 55 grain ballistic tip bullets and Varget propellant.
I tested ten rounds with 26.1 grains of Varget and got the following velocities:
3375
3319
3406
3383
3388
3412
3398
3416
3422
3418 - for an average velocity of 3393.7 fps
The next week I tested 26.3 grains, again starting with a cold barrel, and got:
3216
3356
3368
3355
3346
3344
3352
3386
3369
3365 - for an average velocity of 3345.7
Amazing. Increasing the charge actually decreased velocity. Anyone else have this happen? What do you suppose causes it?
Equipment: .223 bolt action Rem 700, Nosler cases, CCI#400 primers, Nosler 55 grain ballistic tip bullets and Varget propellant.
I tested ten rounds with 26.1 grains of Varget and got the following velocities:
3375
3319
3406
3383
3388
3412
3398
3416
3422
3418 - for an average velocity of 3393.7 fps
The next week I tested 26.3 grains, again starting with a cold barrel, and got:
3216
3356
3368
3355
3346
3344
3352
3386
3369
3365 - for an average velocity of 3345.7
Amazing. Increasing the charge actually decreased velocity. Anyone else have this happen? What do you suppose causes it?