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Cold bore shot vs dirty bore shot

 
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  #1  
Old 04-22-2012, 12:13 AM
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Cold bore shot vs dirty bore shot

Hello,

I have a savage 116 stainless flutted in the 6.5x284 accura trigger accura stock. My question is about my first cold bore shot is slower in volecity and it shoots about 1 to 1.5 inches low. After the first shot, with my reloads its a .5 to .7 inch shooter all the way to 20 plus round durring a shooting secission letting the barrel cool after each shot. I alway was told the first cold bore shot will or should be your best and fastest shot. Could someone explain?
I fell that before I go hunting with this gun i better get the barrel seasoned with one shot down the pipe.
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Old 04-22-2012, 02:32 AM
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Re: Cold bore shot vs dirty bore shot

I've never seen a cold barrel shot faster than a warm barrel shot. What you're seeing is normal IMO.
Prep for what you need. If it's clean cold barrel, fouled cold barrel, warm barrel, hot barrel whatever. You can also pre-foul a bore with something like WS2 as part of your cleaning routine, to get the first cold shot with others.
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Old 04-22-2012, 01:05 PM
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Re: Cold bore shot vs dirty bore shot

Typically lower engraving forces result in lower velocity though it can go either way. Shooting with a "clean" barrel vs a fouled barrel with everything at the same temperature should show if that's the problem. A clean but lightly lubricated barrel can perform very different from a clean dry barrel. I prefer to not clean a barrel if I'll use it again soon. I'd never shoot a match without sighter/fouling shots where they're allowed. Sighting and fouling shots can be just as useful for hunting.

The temperature of the powder in each cartridge at the time it's fired will also effect their velocity Firing a rifle can also effect the point of impact relative to the point of aim from thermal bending of the barrel, action, base, rings, or scope. With simple tests at a range with a chronograph and a little thought the cause of point of impact movement can be sorted out.

I've taken a heat gun to the range a few times to find stubborn thermal sensitivity problems. They make sense after your find them. Having a steel action and an aluminum scope at different and varying temperatures tightly tied at two locations with rigid rings is just asking for bending problems, particularly if the bases don't fit the action properly.

Last edited by LouBoyd; 04-22-2012 at 02:20 PM.
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Old 04-22-2012, 06:40 PM
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Re: Cold bore shot vs dirty bore shot

What you are experiencing is fairly normal for the most part. Whenever I go to the range to practice, or when developing a load, I always take a few " fouler" shots before getting serious. Most factory, and even some custom rifles are that way also. As far as hunting, and with that knowledge that the first shot, cold and clean is going to be out of the group, just sight your rifle the day before, or just shoot a few foulers. That way, the bore is " slightly" fouled. I have done that for years anyway. I wouldn't worry about it, or think into it at all. Enjoy!!!!
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Old 04-22-2012, 10:29 PM
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Re: Cold bore shot vs dirty bore shot

Thanks for the tips. I read some other post and it sounds like cleanning the barrel back to bare metal compared to a fouled barrel can make a world of difference on non custom barrels. I also may be leaving to much oil in the barrel after cleaning and then shooting. I try cleaning and swabbing several times till the patches are completely dry and shoot. But for as the rifle its been a good shooter after that first cold shot. I usually wait about 3 minutes between shots as well.
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Old 04-22-2012, 10:49 PM
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Re: Cold bore shot vs dirty bore shot

It's been my experience that most factory barrels are a bit rough and it takes a few fouling shots to fill in their micro pits until jacket material no longer gets scraped off bullets and unbalances them.

On the other hand, top quality match barrels are lapped smooth enough that the first shot from a clean barrel and subsequent shots are within 1/4 MOA of each other. This happens from shot to long range and the vellcity diffrence between the first two and the rest of the 15 to 20 shots is usually less than 10 fps.
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Old 04-22-2012, 11:13 PM
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Re: Cold bore shot vs dirty bore shot

All barrels are different. Some like a clean cold barrel others like a slightly fouled barrel
that is cold.

I have had both and one of my favorite rifles likes one fouling shot followed by a dry patch
just to sweep out the barrel. Then it is ready to go hunting.

A clean barrel lightly oiled changes the POI on some rifles and it is wise to know what your
rifle likes best through experimentation.

One reason I like the stainless barrels is that they don't have to be oiled every time you
shoot them and if they need a fouling shot it is ok to leave it that way for a short time.

I like to use the bore snake for this and carry one with me on the hunt so that after a shot
I can sweep the barrel and I am ready to make the next shot with the barrel in it's favorite
condition.

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