Before I start loading, I try to find the original load and velocity. I will then try to duplicate that. If using NfB, I use 4198 and will try a few loads, starting at 40% (weight) and loading up to 45%.

For all NfB loads, I use a filler (open cell biodegardable foam) to keep the powder by the primer. I found that gives more uniform velocities.

I will load 4 cartridges for each load. I will shoot 2 cartridges in each barrel I will use 2 targets, one for right and the otyher fopr left barrel.

This allows me to see
1. how accurate each barrel is wu=ith that load and
2. how well the rifle regulates by comparing the two targets.

When I shot at one target, it is easy to confuse which hole is from which barrel.

After 4 shots, I will shoot another gun so as top let the double rifle cool down. Some rifles will lose their regualtion is shot hot. (I generally bring several rifles & pistols to the range)

I like to check velocity to verify my loads are approximately the same velocity as the rifle was built for. The little Garmin makes velocity checking very easy.