Beretta 1301 - spring cap limiting capacity

Some people may have issues loading 7 rounds into a Beretta 1301 magazine tube and the reason can be one of two things.

1. Your rounds are too long; Unfired shell lengths anywhere from 2.155" to 2.450" for 2.75in shells and 2.405" to 2.760" for 3in shells is considered in spec. Note that the shortest in spec unfired 3" fold crimp shell is equivalent to the max length of an unfired in spec 2.75in shell fold crimp shell. The roll crimp shells are likely the reason why you won't be able to fit 7rds into the magazine tube as it is somewhat mimicking shorter 3" shells. The fired hull lengths is what determines whether a shell is a 2 3/4 or 3 inch shell.

For more information about lengths of ammo for 12ga, see page 20 of the SAAMI specifications https://saami.org/wp-content/uploads/2019/06/ANSI-SAAMI-Z299.2-Shotshell-2015-R2019-Approved-2019-04-23.pdf

SAAMI specs below -
2 3/4" cartridges is -
2.405" (tolerance -0.25") folded (star)
2.45" (tolerance -0.25") rolled
2.760" (tolerance - 0.100") uncrimped (fired)

3" cartridges is -
2.655" (tolerance -0.25") folded (star)
2.760" (tolerance -0.25") rolled
3.010" (tolerance -0.100") uncrimped (fired)

2. You have the "Cap for Cross Magazine Tube 1301/A400/A391 12 Ga" in the magazine tube. Remove it as it's not necessary. All this plastic spring cap does is prevent the spring from flying into your face or eyeballs when removing the end cap; well that and reduces the amount of space inside the magazine tube. Reinstall either your aluminum Nordic end cap (or other brand) or the new "Gen 3" plastic shroud/cap/cover without the spring cap. Just be aware that future disassembly will result in the spring "springing" out and hold onto the cap otherwise the cap will be launched into the air.

https://estore.beretta.com/en-eu/cap-for-cross-magazine-tube-1301-a400-a391-12-ga/
Beretta part #C59944