splitting the difference cold/warm barrel question..

[Billy Goat]

So the fix should be tightening the screws? I'm not a sniper by any means but for it to be consistently in the same place on the first shot every time makes me think it's not just me.

Unfortunately the answer is a scope that doesn't wander.

 

[Rich M]

I have a rifle that shoots 100 fps faster after the first shot. Not huge but still 100 fps on chrono.

 

[Formidilosus]

I have a rifle that shoots 100 fps faster after the first shot. Not huge but still 100 fps on chrono.

Stop cleaning it.

 

[Rich M]

Stop cleaning it.

Really?

I do clean it about once a year, maybe every 500 rounds...

 

[Formidilosus]

Really?

I do clean it about once a year, maybe every 500 rounds...

Something isn’t right. What’s the chrono? What is the rifle and load, and how many times have you repeated the chrono first round check?

 

[Sandstrom]

Savage model 111 30-06, shooting remington core lokt 180 grn. Nikon BDC scope with the factory rings (not sure what brand, bought this rifle/scope as a package). 1.5" group, usually pulling down to the left. TIA

I am a bit confused, originally you said the first shot was two moa off, then it groups 3/4 moa. But now the gun groups 1.5 moa? Is the 3/4 moa group for three shots, and the 1.5 moa group for 10 shots?

Ryan

 

[Rich M]

Something isn’t right. What’s the chrono? What is the rifle and load, and how many times have you repeated the chrono first round check?

M77/357, .357 mag, 4x Bushnell Banner circle plex.

20 gr Lil Gun, 158 gr and 165 gr bullets - XTP, Fury, FTX - caldwell chrono. It's always the same 1,800 fps first shot, 1,900 fps consecutive future shots. Let it get "cold" and back to 1,800 fps. Been doing this for about 10 years. Decent 100-yard deer gun.

Never really questioned it. Figured most all guns would do something similar. Heat, loss of friction, and such.

 

[Sandstrom]

M77/357, .357 mag, 4x Bushnell Banner circle plex.

20 gr Lil Gun, 158 gr and 165 gr bullets - XTP, Fury, FTX - caldwell chrono. It's always the same 1,800 fps first shot, 1,900 fps consecutive future shots. Let it get "cold" and back to 1,800 fps. Been doing this for about 10 years. Decent 100-yard deer gun.

Never really questioned it. Figured most all guns would do something similar. Heat, loss of friction, and such.

What is your ES and SD on the next ten shots after the first one?

 

[Rich M]

What is your ES and SD on the next ten shots after the first one?

I havent taken it to that level. Next time i go, will measure first and next ten. Will shoot them all in sequence without pause.

Looked in my notebooks and scant .357 data, makes me think am missing a notebook somewhere. Spent a lot of time monkeying w it and figuring out that load 2010-2012.

 

[Formidilosus]

M77/357, .357 mag, 4x Bushnell Banner circle plex.

20 gr Lil Gun, 158 gr and 165 gr bullets - XTP, Fury, FTX - caldwell chrono. It's always the same 1,800 fps first shot, 1,900 fps consecutive future shots. Let it get "cold" and back to 1,800 fps. Been doing this for about 10 years. Decent 100-yard deer gun.

Never really questioned it. Figured most all guns would do something similar. Heat, loss of friction, and such.

I don’t have enough experience with pistol rounds in rifles and to say. That behavior is not at all normal, nor should be happening with centerfire rifle rounds.

 

[Rich M]

I don’t have enough experience with pistol rounds in rifles and to say. That behavior is not at all normal, nor should be happening with centerfire rifle rounds.

Thanks - good to know.

 

[Mikido]

I have the same problem with my bow!