OK, so I have an SMLE No. 1 Mk III that loads with 2 5-round .303 British stripper clips.

The SMLE has:
Name Short Magazine Lee-Enfield Mk III
ShortName kssmlemk3
Ammo ks303clip5
LoadIntoGun 10
Icon kssmlemk3
(extra crap)

The .303 British 5-round stripper clip has:
Name 5-Round .303 British Stripper Clip
ShortName ks303clip5
Model Bullet
Colour 255 255 255
ItemID 26200
Icon ks303clip5
FallSpeed 2
RoundsPerItem 5
MaxStackSize 5
(other stuff)

What I wanted the SMLE to do was consume TWO five-round stripper clips (2 * 5 rounds = 10 rounds) when reloading. Instead, the SMLE consumed TEN five-round stripper clips to load TEN rounds into the magazine. This clearly isn't right. The only current solution is to make magical individual cartridges that magically put themselves into stripper clips when reloading.