My Sigma SW40VE shoots way low

[s&wjeffro]

i have had this sigma for 8 or 10 years, i really don't remember when i bought it. it has always been accurate and fun to shoot. i always shoot 165gr. but i buy whats on sale so that varies.

i had not shot this for about 2 years so i took it on a range day to shoot the dust out of it. everything went 4-6 inches low, 3 different shooters all the same result. different ammo's same result. i cleaned it and tried yet another ammo, 4 inches low at 30 feet.

what happened? i could put an adjustable rear sight on but what if it keeps getting lower?

 

[ou1954]

What happens when you shoot it from a bench rest?

 

[ShelbyV8]

Shoot 180gr that the gun was designed for. The lighter 165gr will shoot low by about the amount you are describing.

 

[OKFC05]

what if it keeps getting lower?

"What if I keep breaking down on the shot?"

That is the real question. The answer is you will keep shooting low with the heavy long pull, striker fired pistol.

 

[s&wjeffro]

did not try that. it seems odd that the problem just showed up after years of not firing from a rest and not having the problem. i will the next time i take it out.

 

[s&wjeffro]

i'll get a box of 180's and try them. it still is odd that nothing changed and there was never a problem with 165's.

 

[s&wjeffro]

so a trigger tune up?