I noticed this aswell while modifying sounds for the F86F I got the math down to get the correct Browning M3 RPM down, but when compared to the Included M3 Browning sounds,it was Far,FAR slower,I think what needs to be nailed down is afew things,
1.Is there a correct amount of ammo total/per gun
2.If the game actually renders the bullets at the correct RPM as well
Ive included the two sound files,the custom one i made,and the Vahnilla one for proof. F86.rar