Because this rifle is using a magazine well designed for the 223 Remington cartridge, this limits the overall length of the cartridge that will fit and feed in this magazine
If handloading, the WSSM has an overall length of 2.36" but the cartridge will need to be 2.34" or less to fit this magazine, and 2.3" is probably a good starting length as there may be slight variations between magazines
Factory ammunition loaded with long, heavy bullets will likely not fit in this magazine
While all WSSM cartridges have an overall length of 2.36", a problem with fit has been reported more with the 25 WSSM than with the smaller caliber WSSM cartridges
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