^^^ This. I started flying with my reloads in late 70s, never had an issue. Also, other than customs guys counting rounds never had anyone look at the ammo either.I just use hard sided plastic slip boxes that I tape shut and have had zero problems.
I believe that they just don't want the ammo bouncing around loose
I have taken my handloads on all my trips to Africa. As long as the ammo is not "loose" you are fine with ammo in a plastic box. Some countries require that ammo is in a secure locked container inside your checked bag which must also be locked. I used a Pelican gun vault, medium size and found it more than spacious enough.
Pay attention to ammo weight. Inspection/enforcement is hit and miss but it does occur. It is also best that head stamp on brass matches the caliber listed on firearm. I flew Ethiopian Airlines in June of this year and they showed more interest in ammo than other carriers I have flown.
The guts from TWO MTM cases. Appropriate to cartridge size.
Cut with a Soldering Iron
80 and 60 cartridges.
300 Win Mag and .270 Win respectively.
Handled Deluxe Rifle Ammo boxes by MTM Case-Gard? - 100 Plastic handled ammunition reloading boxes and cartridge cases
A Pelican 1200 case.
Water proof, lockable with my own locks.
Pelican Products 1200 Case
How I figured out the configuration.
Ammunition Weights for Airline
Pelican 1200 Empty -- 1210 Grams
130 grain PSP Corelokt Box 20 --- 544 --- 3808 Grams
Plastic Box for reloads --- 98 Grams
Remington Cardboard and Plastic Holder --- 46 Grams
20- 130grain psp Coreloks Bullets --- 496 Grams
1 Cartridge --- 24.8 Grams
7 Boxes fit in the Pelican --- Total 140 Rounds --- 5018Grams
Over All Weight --- 5.02 KG
Grains per Gram --- 15.4323584 Grams
Increase for 180 Grains --- 55 Grams
Grams per Cartridge ---3.563940039 Grams
Cartrdiges 60 --- 213.8364023 --- 214Grams
Ammunition Weight --- 80 180 Grain 60 130 Grain --- 4022 Grams
Over All Weight --- 5232
Can remove 10 cartidges and be at the exact weight
@MarkBI am not sure if its valid with all airlines, but I would read many times the rules of airline you are flying with. But my reloads are in factory boxes same as stamps on rounds, then locked in hard plastic ammo container and in checked bags. Seams like a small thing to do to alleviate any issues at airports. Too many issues already, too many antis and too much stress. Avoid what's avoidable.