Hi Gary, the best ammo for the DPMS Kitty Kat in .300 Blackout typically includes subsonic rounds for quieter shooting or supersonic rounds for increased velocity and energy. Popular choices are the Hornady 208-grain A-MAX for subsonic and the 125-grain SST for supersonic applications.
budsgunshop.com/product_info.php/products_id/22883/hornady+black+300+aac+blackout+208gr+a-max+20rd+box ,
budsgunshop.com/product_info.php/products_id/84977/super+shock+tip+sst+bullets+.308+diameter+125+grain ,m
Stay safe & have a great day!

The best ammunition for the 7.5-inch DPMS Kitty Kat .300 Blackout is generally 110–125 grain supersonic rounds for reliability and self-defense, or 190–220 grain subsonic rounds when shooting suppressed, as the fast-twist 1:7 barrel handles both exceptionally well. Top choices include Barnes VOR-TX 110gr TAC-TX for hunting/defense and Hornady Subsonic 190gr Sub-X for quiet operation.
Top Ammo Recommendations:
Best Overall / Hunting: Barnes VOR-TX 110 grain TAC-TX offers excellent expansion.
Best Subsonic/Suppressed: Hornady Subsonic 190 grain Sub-X or Underwood 220gr are designed for consistent, quiet performance.
Best Range/Target: 150-grain FMJ rounds work well for training.

Try here: budsgunshop.com/product_info.php/products_id/723045151/hornady+custom+rifle+ammo+.300+blackout+135+grain+ftx+20+rounds />OR
budsgunshop.com/product_info.php/products_id/182137/wilson+combat+a300blk220hpbt+300blackout+220gr+hollow+point+boat+tail+20+per+box10+case%3Cbr

Hi Gary and welcome to the community. Hornady Hyper performance Super Shock Tipped is an excellent all-around load: budsgunshop.com/product_info.php/products_id/98261/fiocchi+300blackha+extrema+.300+black+7.62x35mm+125+gr+sst+25+bx --------------------------------------------------------------- The Barnes Suppressed load: budsgunshop.com/product_info.php/products_id/187246/brns+32518+300aac+bo+220+smk+20+10 -------------------------------------- The Kitty Kat will benefit from a short barreled optimized load: budsgunshop.com/product_info.php/products_id/415016874/hornady+300+backout+111gr+monoflex+tap+sbr+20rd --------- Cheers, stay safe and enjoy!

Hornady 135 grain for unsuppressed. ---
budsgunshop.com/product_info.php/products_id/723045151/hornady+custom+rifle+ammo+.300+blackout+135+grain+ftx+20+rounds ---
Wilson Combat 220 grain for suppressed ---
budsgunshop.com/product_info.php/products_id/182137/wilson+combat+a300blk220hpbt+300blackout+220gr+hollow+point+boat+tail+20+per+box10+case />

Good evening to you!! The Hornady black line is hard to beat. 110 grain for unsuppressed and 208 grain for suppressed. Hope this helps. Have a good rest of your day.
budsgunshop.com/product_info.php/products_id/22882/hornady+black+v-max+300+aac+blackout+ammo+20+round+box ---
budsgunshop.com/product_info.php/products_id/22883/hornady+black+300+aac+blackout+208gr+a-max+20rd+box