John, the Speer Gold-dot 230g JHP are the Hornady Critical Defense .45 ammunition has excellent reputations in non jamming self defense ammunition in the S&W MP4 shield. budsgunshop.com/product_info.php/products_id/15833/speer+45+acp+230+grain+gold+dot+hollow+point --------------- budsgunshop.com/product_info.php/products_id/411555565/hornady+45+auto+185+gr+ftx+critical+defense ------------ For target/range ammunition, Remington Flat Nose is good : budsgunshop.com/product_info.php/products_id/67949/remington+45+acp+230+grain+flat+nose+enclosed+base

while it will be fine with any good quality ammo to know what is best in "your" gun requires you trying as many different loads as you can every gun is different in what ammo it "likes best "

Sorry. I see the pistol you mentioned.

There’s no pistol selected. Honestly, so many modern bullets are great. It’s a matter of shooting them and choosing what you and your firearm like best. What works for mine best might not work for yours best even if it’s the same firearm. I can make some suggestions, though. Federal HST. Hornady Critical Duty. My favorite might be Sig Sauer Elite Performance V-Crown in 230 grains. It was my pleasure to assist you.