change of poi as gun warms up?

[douglas_knott]

Originally Posted by svandamme

wildo, thanks for the feedback

let us know the outcome please

[svandamme]

never mind the .22 holes, i just re-used somebody's card


first set of 10 rounds right handed @ 10 meters



second set of 10 rounds right handed @ 10 meters



10 rounds, 2 handed @ 25 meters (bad pic but you get the idea)




2 x 10 rounds @ 10 meters green is right handed, purple is lefthanded




I first ran 50 rounds with a Ruger .22 as warm up...Which improved my .45 results considerably, all in all, i guess this answers my question : It was me, not the gun.
Quite happy with this result, especially since i'm a bit hungover this morning

[jcc7x7]

You might try a different lube on your pistol that may be more heat resistant and not cause binding. If the pistol is changing POI when hot something is binding. Hope this helps

[Pappy]

This is not good news if the barrel has not been stress relieved. You may have a warped barrel which changes POI when warmed up. Sorry to say this...

[svandamme]

Originally Posted by svandamme

snip
2 x 10 rounds @ 10 meters green is right handed, purple is lefthanded




I first ran 50 rounds with a Ruger .22 as warm up...Which improved my .45 results considerably, all in all, i guess this answers my question : It was me, not the gun.
Quite happy with this result, especially since i'm a bit hungover this morning

Originally Posted by Pappy

This is not good news if the barrel has not been stress relieved. You may have a warped barrel which changes POI when warmed up. Sorry to say this...

I already indicated that the issue was fixed by training the operator.

[Pappy]

Originally Posted by svandamme

I already indicated that the issue was fixed by training the operator.

Did not notice this...but will wait till the hangover is gone....

[Hodawg]

Glad to hear you figured out the problem, svandamme.

Just for shirts and gurgles, in case this problem ever comes up again with another shooter, svandamme's situation sounds like a classic case of anticipating recoil. That causes most shooters to dive forward, hence a low shot. After a few magazines full, the shooter gets more relaxed and no longer anticipates recoil, then the shots come up to the POA.

Just a thought based on his description of events.

Ken

[DaFadda]

My take is that when the gun.......and you......are cold.....poi will be diferent. Once you warm up.....not the gun....that is the diff in poi. Try having a friend warm up the gun for u....then shoot it urself..... Post the results for us?

[Hodawg]

Originally Posted by DaFadda

My take is that when the gun.......and you......are cold.....poi will be diferent. Once you warm up.....not the gun....that is the diff in poi. Try having a friend warm up the gun for u....then shoot it urself..... Post the results for us?

A good suggestion for ruling out metallurgical factors.

[Dave Waits]

The only time you'll see a cold-bore change of impact is in a long-barreled gun like a rifle and normally, it's usually the first round out of the tube.