How is 1000 rounds something unusual?
You could go through that easily, just for target practice.
On the last M16 Qual range I took my Army National Guard soldiers on, we were issued 49 rounds - nine to zero your weapon, and forty to qualify.
I needed six to zero, and I renewed my Sharpshooter badge.
My basic load in Ramadi for OIF 3 was 200 rounds of .223 ball and tracer. That's six 30-round magazines in my body armor, and one 20-round in the weapon with a round in the chamber.
So yeah, a thousand rounds would raise some LEO eyebrows.
To some in political positions, it could be considered an excess of quantity for the average game hunter not giving thought to the 2nd amendment.