change of poi as gun warms up? - Page 2

Pappy · #11 11-23-2011, 10:34 AM

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 · #12 11-23-2011, 10:36 AM

Quote:

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

Quote:

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 · #13 11-23-2011, 10:44 AM

Quote:

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 · #14 05-17-2014, 02:14 PM

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 · #15 05-17-2014, 04:18 PM

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 · #16 05-17-2014, 04:49 PM

Quote:

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 · #17 05-17-2014, 05:43 PM

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.

DrHenley · #18 05-17-2014, 11:30 PM

Quote:

Originally Posted by svandamme

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.

I think your grip loosens a bit when you get a little tired from gripping too tight and anticipting the recoil, allowing the muzzle to flip more. Warming up with another gun gets you past the too-tight grip phase.

I've noticed the same phenomenon, using a 22 first improves my groups considerably.