4,4 & 5,3 Question

[Hondo 60]

Bought a few primers during the recent S&B sales at Cabelas.
The Small pistol boxes are marked 4,4 SP Boxer.
Small Rifle marked 4,4 SR Boxer.

(LP & LR are marked 5,3 LP Boxer & 5,3 LR Boxer, respectively.

I understand SP to mean small pistol etc.
What I don't understand is the numbers.
Does anyone know what 4,4 & 5,3 mean?

 

[rcmodel]

Metric , millimeters?

It doesn't translate exactly, but I think that's what it is.

Small primer = .175" = 4.445mm.
Lg primer = .210" = 5.334mm.

rc

 

[NeuseRvrRat]

yeah, those wacky europeans use a comma instead of a period for a decimal point

 

[JimKirk]

Them Metrics folks use a comma instead of a "." .... RC got it ...

 

[Hondo 60]

ah - OK thanks for the replies