Equipment & Gear > Guns and Ammo

Cold bore or fouled barrel.

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Crunchy:
Ok.  I have noticed my first shot on a clean and cold barrel is about 2.5 inches high and a tad to the right at 200 yards.  Is it a clean barrel or cold barrel that likely causing this?  It is also about 30 fps slower.  I didn't clean my barrel after shooting today to see what it does on my next range trip.  Anyone figure this out?  Groups awesome and roughly 12fps SD over 25 rounds.

ELKBURGER:

--- Quote from: Crunchy on May 15, 2025, 12:36:00 PM ---Ok.  I have noticed my first shot on a clean and cold barrel is about 2.5 inches high and a tad to the right at 200 yards.  Is it a clean barrel or cold barrel that likely causing this?  It is also about 30 fps slower.  I didn't clean my barrel after shooting today to see what it does on my next range trip.  Anyone figure this out?  Groups awesome and roughly 12fps SD over 25 rounds.

--- End quote ---
I have noticed similar affects with cold bore mostly. Since it is mostly noticed between coyote hunts with very few shots, I dont clean the barrel after every hunt. When I check zero with a cold bore, first shot is a bit high and subsequent shots will stack on original zero.
Question is, do you zero for cold bore or follow up shots on warm barrel. For a hunting setup, cold bore shot should be the most important.

fishngamereaper:
In my previous life we had to document every cold bore shot.
My rifle's where always high right. Still sub moa....but off.
Every gun is different.
Was it off enough to make a difference for hunting...no
But for what we did it was necessary knowledge.
We also fouled our barrels after cleaning.
A clean barrel seemed to make the cold bore worse.

Mtnwalker:
Shoot a 5-7 shot cold bore group with ample time between shots and never hunt or zero on a freshly cleaned bore  :twocents: you shouldn't be getting movement like that from cold to warm unless you're getting contact somewhere when things heat up or something else weird is going on. My guess is the culprit is the clean bore more so than the cold

Bob33:
For hunting purposes the way I often test the accuracy of my rifles is to take one shot, take the target home, come back another day and take another shot...

A three to five shot group taken that way tells me much more about what I can expect while hunting. The first shot is the one that should matter most in a hunting situation.

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