Oil in the bore.

Skinny 1950

Skinny 1950

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I have had a couple of guns that shoot really bad until they have 5 or 10 rounds through them and then they start to shoot great.
I am starting to think that it could be the oil in the bore, anyone ever heard of such a thing.
Could also be temperature of the barrel.
Any thoughts?
 
Don't know ANY firearm that doesn't shoot better after a couple of fouling shots. First few shots out of a pristine barrel will always strike a different point then the rest. How much off and how many rounds to get it to settle down vary per firearm
 
Don't clean after the next shoot and then see how it shoots the first 10 shot the next time you go to the range.

I clean my target rifles only 2 or 3 rimes a year. The quality stainless barrels don't foul much and the first shots out of the barrel pick up where the gun left off.
 
Ganderite said:
Don't clean after the next shoot and then see how it shoots the first 10 shot the next time you go to the range.

I clean my target rifles only 2 or 3 rimes a year. The quality stainless barrels don't foul much and the first shots out of the barrel pick up where the gun left off.
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Don't brush the bore next time. If anything just shove a patch or two through it. Every gun I have shoots better after a few rounds.
 
I agree with everyone on the fouling shot issue, you need the bore slightly fouled before its happy. But also, oil in the bore can be a big issue, causing possible pressure issues and accuracy issues. Oil your bore for storage, totally clean bore before shooting, fire 4-5 rounds and then you should be as good to go as possible.
 
I was reading somewhere oil in the barrel reduces the friction between the bullet and the grooves thus reduced accuracy. I tested this theory with my K98 and it was kind of true. When the oil burnt off after few rounds the accuracy increased
 
Skinny 1950 said:
I have had a couple of guns that shoot really bad until they have 5 or 10 rounds through them and then they start to shoot great.
I am starting to think that it could be the oil in the bore, anyone ever heard of such a thing.
Could also be temperature of the barrel.
Any thoughts?
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Like deagle said, oil in the bore will reduce friction thus lessen the groove effect on the bullet rotation. Cold is another matter, a cold bore won't be as accurate as second or third shot. The cold that constrict the steel but the the ballistic & accuracy of the projectile with a "hot" bore will improve since heat will make the bore grooves more effective, this is more noticeable on rifles but still true for all "accurate" firearms.

Edit: explanation
 
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Harry Callahan said:
Like deagle said, oil in the bore will reduce friction thus lessen the groove effect on the bullet rotation. Cold is another matter, a cold bore won't be as accurate as second or third shot since steel will constrict when it gets hot, the ballistic & accuracy of the projectile with a "tighter" bore will improve dramatically, this is more noticeable on rifles but still true for all "accurate" firearms.
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what's the groove effect?
 
legi0n said:
what's the groove effect?
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After the first few shots you find your groove and accuracy improves. ;).

I think he is saying that as the steel in the barrel barrel expands from heat, the bore gets tighter and the grooves/lands bite deeper into the bullet. At least that's how I interpreted his comments.
 
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Harry Callahan said:
Like deagle said, oil in the bore will reduce friction thus lessen the groove effect on the bullet rotation. Cold is another matter, a cold bore won't be as accurate as second or third shot since steel will constrict when it gets hot, the ballistic & accuracy of the projectile with a "tighter" bore will improve dramatically, this is more noticeable on rifles but still true for all "accurate" firearms.
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Um, steel expands as it heats up...it contracts when it's cold..., .001 of an inch, per inch of diameter, per hundred degrees F....so unless you shoot a 45 till it's 400 degree, the bore won't expand more then 2 thou....

If you can hold the gun in your hands, it's not hot or cold enough for thermal expansion or constriction to have made a difference.
 
There shouldn't be any oil in the bore or chamber on the first shot. Pull a couple of clean, dry patches through the bore or use a bore snake first.
On a hunting rig, the first two shots out of a cold barrel are the most important. With some rifles, the POI can change between a clean barrel and a barrel that has fired a few rounds. Barrel heating/bullets "walking" is another matter. Know your rifle.
 
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legi0n said:
yes, you're right, in theory at least.
I've fired many times on oily bores with no ill effects.
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There are other reasons for not having an oily chamber. The name of the game is to reduce the variables. But hey, medium/big game hunting accuracy is not the same as competition shooting. Night & day really.
 
StoneHorse said:
There are other reasons for not having an oily chamber. The name of the game is to reduce the variables. But hey, medium/big game hunting accuracy is not the same as competition shooting. Night & day really.
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Yep, I hear you and I too have read about ringed chambers and bores due to too much oil.
But when I'm hunting in less than ideal weather I'd rather have a thin layer of oil in the chamber and bore.
But that's just me :D
 
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