Originally Posted by fariswm
I'm shooting a Ruger #1- no custom barrel. Primers are flat at 2 gr under max load for most bullet weights. Have never chronographed any loads so I can't tell you velocity. I guess maybe its time I purchased a chronograph. Weapon shoots MOA with several bullet weights- even with me shooting it.
Primers differ. Some are harder than others. It's not a reliable pressure sign. Many factory loads exhibit flattening of primers. If you reload and don't own a chrony, then you're just guessing. Velocity, not your powder charge will tell you about pressures. Look at .280 data in the Nosler manual. They use a 26" bbl. If yours is shorter, then subtract roughly 30fps per inch. If you got a 24" bbl, then just say you'll lose 60-75fps. Nosler loads to 60K psi...their velocities are doable, but you may require more powder for the same velocity as powder lots differ, sometimes greatly. Loading to Noslers velocity is very safe as theirs is done at or below 60K psi. Their load velocity is beatable if you want to load to 65K psi. I try to keep mine in the 62K-63K range, and the velocities I posted above, Quickload says I'm right in that range.
Spend $99 and get a shooting Chrony. It's an invaluable tool for a handloader. I think you'll find that you're well under factory ammo performance in velocity. And yes, accuracy can come just as easy at a real max load as under it.
I'll also note, that the velocities I get are with slow powders like R-19, R-22, H4831, N160, and N165. You wont get the same velocity safely if you're using 4350s or faster powders.