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How many are interested in their CBS???

 
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  #1  
Old 09-27-2007, 03:24 PM
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How many are interested in their CBS???

Since this is a hunting forum and hunting season is here for pretty much all of us , I was just thinking......and that can be bad.

How many of you know what a CBS (cold bore shot) is (don't take this personal) and know where it goes for each rifle/handgun you hunt with? Same goes for a CCBS (clean cold bore shot) although anything I personally hunt with is going to be fouled properly before I go out.

I know everybody "sights their gun in" and zeros it at a certain range, but what happens with it when you take it stone cold out of the case, go hunting and have to make that first, important shot?

How many of you think it important to know where the CBS goes?

How many of you know where the next 2 shots will go immediately after your initial CBS? Since this is a hunting forum I am using a 3 shot group format.

How many of you actually document the CBS and the following shots that might occur under hunting conditions? Hopefully only the first shot will be all that is ever needed.

I've been tracking this on my 7mm AM and this is a CBS with 2 additional shots done a few days ago in the wind.


I don't always shoot the other 2 shots. This is one I just did yesterday to check the CBS and then went to busting rocks at about 1400 yards.


My personal view is that if I don't know where the CBS is going to go then how can I go hunting game animals. I almost always check my CBS at the range I zero at, which is 300 although I will also, when out playing, try it at any range I can see a rock that looks like it's going to attack. ;)

Admittedly this gun makes life a little easier as I have a couple of guns that aren't nearly this user friendly.
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Old 09-27-2007, 03:38 PM
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The CBS as you call it is the only shot that counts, in my opinion.

My 270 AM does about what your 7 does w/169 RBBTs though.

The way I do thing's the CBS is going to be the only shot you get. If a second shot it needed it will be most probably a CBS also and a long time from when the first CBS was shot.;)
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Old 09-27-2007, 06:03 PM
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with my 700p 300 rum a ccbs is dead on and a cbs is dead on theres no shift in point of impact as i shoot it. with my 300wm ccbs 2 inchs high cbs 1 1/2 inch high
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Old 09-27-2007, 10:12 PM
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Dick,

My 7AM does about the same as yours does..what a coincidence..the first CCBS is usually a little off, but I also have been shooting a few rounds to foul the barrel before I get serious.
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  #5  
Old 09-28-2007, 11:00 AM
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This is a good topic, one that is actually critical in the field. I have tested this as well and will say in factory rifles, this can be critical at extended ranges as the first shot can vary quite a bit from the following shots.

THe reason, well, obviously machining quality, barrel quality, bedding, all that comes into play.

I have also noticed that in a properly built rifle, one that has a square receiver, a barrel that is threaded on axis to the receiver axis, a chamber that is perfectly on axis with the bore and receiver and in a rifle that is bedded properly in a solid non stressed method into a solid rigid stock, the first shot will generally fall into the moa ability of the rifle.

What the hell does that mean????? Well, if a rifle will shoot 1/2 moa on average, that first shot will land with in the group of this size. Looking at the group from your rifle, it is a perfect triangle which tells us that things are square and bedding is good and your ammo is straight and consistant. YOu must be a hell of a handloader and your gunsmith must be world class!!!, well we know the first one is true......

How do I prepare for the big game season. Well, like you I do load development long before the season begins. Then once that is done, the vast majority of my shooting is done for the year. From that point on, I work on my drop chart, tweaking here and there to match it up as perfectly with actual bullet flight as possible.

Then about this time of year, when the temps start to get down into hunting type temps, I will take my hunting rifles out with customers rifles when I test them before shipping. After shooting the customers rifles(work first!!!) I will pull out my personal rifle with only two shots. Find a target of opportunity. What I look for is a well defined rock, roughly 4 to 8" in diameter for a target.

I range it, check the wind and conditions if ranges are past 500 yards, run the numbers and get the hold. I will then settle in with a fouled cold bore and take the first shot and follow it up with the second as quickly as I can get it in the air similiar to what you would see if hunting big game and a second shot was needed.

I then record the impact points and will compare that to my drop chart predictions. By this time of year, things are generally THERE. By that I mean impacting less then 1/2 moa from point of aim. If I can do this from field shooting positions I am happy. I will test out to ranges far past where I will shoot at big game. For example, I have been testing my 338 AM out to nearly 2000 yards this fall but have no intent to push things this far with the rifle, even though in the right conditions it makes this range seem pretty easy.

Last trip out, I broke the right and left edge off an 8" rock at 1980 yards with the first two shots, from a cold barrel. Petted her warmly, call her some very nice things and put her back in her warm case!!!!

I never shoot from a clean cold bore. In fact every time I clean a rifle, when she is done, I oil the bore lightly, take a fouling round and go out behind the shop and sink a round into the old cotton wood stump so that I never have to worry about a fouling shot in the field. Would it make any difference, I am sure it would because every shot I fire from a freshly cleaned bore is through an oiled bore, ALWAYS, never a dry bore so one can only expect if nothing else velocity will be effected because of the oil in the bore.

Anyway, good topic, I believe in factory rifles, this is far more critical then in a properly built custom rifle but its always something that you need to know about your rifle, just goes back to being intimately familiar with your gear before heading to the field.

Looks like big grey will be eating well this fall for you!!! Remember to send the pics!!!

Kirby Allen(50)
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Old 09-28-2007, 11:32 AM
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Quote:
Originally Posted by Fiftydriver View Post
Last trip out, I broke the right and left edge off an 8" rock at 1980 yards with the first two shots, from a cold barrel. Petted her warmly, call her some very nice things and put her back in her warm case!!!!
Kirby Allen(50)
WHEW! glad I'm not the only one who strokes and talks to his rifles.

Before the corn got too tall, I would take my fouled rifle (Savage 300 WM) from the case, walk to the edge of the farm and back to the house (about 1 mile through the hilly parts) set up and take a shot at my 300 yard target. Note the impact and conditions, and put the gun away. Two or three times a week. I only have limited areas to practice at ranges beyond that, but when had the chance, I've still been consistent out to about 600 which is my limit until I can practice out further.

Aside from when I first got it, I don't know if it ever had three shots rapidly fired through it.
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Old 09-28-2007, 12:46 PM
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Quote:
Originally Posted by Fiftydriver View Post
What the hell does that mean????? Well, if a rifle will shoot 1/2 moa on average, that first shot will land with in the group of this size. Looking at the group from your rifle, it is a perfect triangle which tells us that things are square and bedding is good and your ammo is straight and consistant. YOu must be a hell of a handloader and your gunsmith must be world class!!!, well we know the first one is true......

Looks like big grey will be eating well this fall for you!!! Remember to send the pics!!!

Kirby Allen(50)
What it means is.........you send your bag of parts and pieces off to Montana, then you pace the floor waiting and writing redundant e-mails off to APS wasting Kirby's time, then you wait some more and finally the little brown truck brings you a package and all is well with the world once more.;) You go to the range and the wait was worth it.

Hell of a handloader........don't think so. World class gunsmith.......that's my opinion, and a whole lot of others as well. Since I first posted about the care package from Fort Shaw when I first got the gun, I've responded to dozens of e-mail inquiries about the smith and gun from all continents except Asia and Africa. You'd be surprised what some people want a gun like that for.;)

'Ol grey will feed well this fall if I can find a furry critter and get him to co-operate with me.

At least I confident as to where the first shot is going to go, at any range.;)
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