purpose for a hollow base?

[briang7511]

i see that powder valley has 9mm 124 gr hollow base round nose. what is the intended purpose of the hollow base? link below for photos

Berrys .356 / 9mm 124 Grain Hollow Base Round Nose Thick Plate Bullets (250 or 1000 Bullets)

Berry's .356 / 9mm 124 grain hollow base round nose thick plate bullets from Powder Valley are popular with pistol reloaders. Shop 250 and 1000 ct boxes today.

www.powdervalleyinc.com

 

[grebski]

Maintaining velocity with lower powder charge

 

[6.5SH]

With typical HBWC it is to ease/increase obturation which increases gas seal and provides more consistent velocity.

 

[Bigfatcock]

Longer bullet with lower weight.