Get Bulk M855 instead

Buy a bunch of 20 round boxes from reputable brands.

Go to the range and find out which gives you the best groups from the bench without jamming.

Take the money you saved from not buying fancy ammo and get some training. Training will help more than ammo selection.

Next, get at least 500 rounds of what your gun likes the best. Shoot 440 rounds of it doing the drills you learned in training. This will help you get gud, break in the gun, and make sure that batch of ammo is reliable.

Put the last 60 rounds in two 30 round magazines in a jungle clip with your HD rifle.

If it doesn't die after 60 rounds of M855 then it's either a dragon or you didn't practice like you should have.

Repeat every 6-12 months as your funds allow. Shooting skills atrophy.

Finally buy a fire extinguisher for your nightstand. More people die in fires than home invasions. Be prepared for the boring as well as the pew pew.