Precision Rifle - Page 10

craigepo · 07-06-2011, 20:43

Quote:

Originally Posted by Dusty

"Heavy barrel"-good idea. IMO, the heavier the barrel, the more accurate it is. (to a certain point)

Ugg. I hate heavy barrels. They are ok if you are going to shoot from one spot. Unfortunately, I have found that the older I get, the more difficulty I have in hauling my fat butt up the side of a mountain. I hate to make it even harder by lugging an extra couple pounds of barrel.

My #3 Lilja is extremely light, and is about 1/2 minute of angle, with approximately 50 rounds through the barrel. Of course, I am sure it would have problems with anything over 5 rounds. But, if I'm firing over 5 rounds without a chance to cool the barrel off, it will be time for me to fix bayonets anyway.

I'm curious to know what barrels some of the long-range guys on here have on their guns.

Blitzzz (RIP) · 07-06-2011, 22:19

Quote:

Originally Posted by craigepo

Ugg.
I'm curious to know what barrels some of the long-range guys on here have on their guns.

I've got a 27.5 inch Shilen on an 8mm Mauserand a Krieger on M1A1. Don't Bench shoot and have 500 meter hits standing off hand with the Springfield M1A1.

More rounds shot over short time make all barrel hot.
Note here to hunters, shoot your zeros with Cold barrels one shot let cool then the next etc. a cold barrel shot zero is what will be the shot that get the game. All the shooters probably know this...except one...I'm not saying who...

gits · 07-06-2011, 23:11

I got a rifle made by Surgeon in a AICS with a 22 inch Krieger barrel with an MTU Contour and can shoot dime sized groups at a 100 meters. Running around anywhere from 2641-2679 FPS depending on the lot of 175gr SMKs. Then again I had a team mate who was shooting +2600 Fps out of his gun with a Bartlein 18 inch barrel

with his 175gr hand loads.

Buffalobob · 07-07-2011, 05:14

For long range work I use long barrels and high BC bullets

Elk rifle is a fluted #8 Lilja 34 inches long with a brake to make it 36 inches long. 7mm-338 Lapua Improved. Because of the weight and extreme velocity it is a very easy rifle to shoot and has killed 7 animals beyond 500 yards.

Deer/Antelope rifle has a heavy NBRSA barrel 30 inches long with brake for 32 inches and has two pounds of lead in the butt stock to weigh a total of 18 pounds. 240 Wby and it has killled six animals beyond 500 yards

F-class rifle Rem 40X has a 28 inch heavy palma barrel - 308 Win. Don't normally use if for long range hunting but under 500 yards it has killed a lot of animals

Goof off rifle- Ruger #1 has a 28 inch barrel with final taper to 0.75 inches. 257 Wby. Killed only one animal beyond 500 yards.

A couple of pictures of the elk rifle after being used by the kids to shoot antelope. You will notice it has no sling on it although it has flush cups and I have a special sling for it.

Dusty · 07-07-2011, 05:38

Quote:

Originally Posted by Buffalobob

For long range work I use long barrels and high BC bullets
Deer/Antelope rifle has a heavy NBRSA barrel 30 inches long with brake for 32 inches and has two pounds of lead in the butt stock to weigh a total of 18 pounds. 240 Wby and it has killled six animals beyond 500 yards

I noticed a big improvement when I weighted the buttstock on my 700. I used a couple pounds of buckshot and Gorilla Glue, and it balanced the whole rifle really well. I've never hit a target past 924 yards with it, though...

Buffalobob · 07-07-2011, 06:39

Quote:

I've never hit a target past 924 yards with it, though...

Around home it is so hilly and wooded that I never kill anything beyond 500 yards. The longest shot I have made in Maryland is 450 yards. I only can make the long range shots out in the west where you can see forever.

Dusty · 07-07-2011, 06:58

Quote:

Originally Posted by Buffalobob

Around home it is so hilly and wooded that I never kill anything beyond 500 yards. The longest shot I have made in Maryland is 450 yards. I only can make the long range shots out in the west where you can see forever.

I shoulda put that in pink.

Buffalobob · 07-07-2011, 13:36

Quote:

Perhaps you should work on your stalking skills.

I am good enough to stalk a sleeping elk and kill it with a bow. The story is in the "fur" section.

I am also good enough to stalk NVA and kill them with hand grenades. They were just all sitting around their cook fires eating breakfast when we threw 20 frags in on them. It certainly scrambled their fish heads and rice.

If you ever visit my facebook page there is a picture of me taken the day afterwards.

Running a recon/sniper team was a real mix of face to face/up close and personal and never even knew we were there/nor heard it coming.

mark46th · 07-07-2011, 14:13

I have the stock 26 inch barrel plus 2 inches or so of muzzle brake on my Remington 700 .338 Lapua. I only have about 30 rounds through it so far. I want to practice with it for awhile before making any modifications. I will take it with me to Wyoming in October...

Buffalobob · 07-08-2011, 14:50

There is a theory (folklore) of heavy barrels that I have some serious doubts about. It is the idea that a heavy barrel does not heat up as quickly as a thin barrel and is therefore superior. I know a little about heat transfer, but am not a a specialist in it. My understanding of the situation is different from the theory (folklore). Heat comes from the burning powder inside the barrel and the inside metal gets hottest and there is a gradient established to the outer surface of the barrel controlled by a coefficient based upon the metal. At the outside of the metal surface and the inside of he metal surface there is a metal to air interface of heat transfer and another coefficient is involved. The job is to get the inside metal surface cooled as quickly as possible and that means getting heat transfer away from it. A thick barrel stores heat in the metal and distributes it outward thereby lowering the inside surface temperature while simultaneously there is a transfer of heat from the inner surface of the barrel to any air inside the barrel. However, a point will be reached when the storage capacity of the metal in a heavy barrel is maxed out and it is as hot as a thin barrel. It then takes the thick barrel much longer to cool than the thin barrel because it has more stored heat and the air metal surface area interface is not all that much more. So after a few shot, a thin barrel is actually as good as a thick barrel as far as heat management goes.

My opinion on heat management may not be correct and it is only an opinion being as I have never actually tried to solve the equations but only perused the coefficients needed to do so.

The real advantage of the thick barrel is stiffness which reduces harmonic vibrations during the bullet traveling down it.

Ramirez · 07-09-2011, 08:27

Quote:

Originally Posted by Buffalobob

The real advantage of the thick barrel is stiffness which reduces harmonic vibrations during the bullet traveling down it.

Which would provide more accurate shots correct?

Thanks for the write up. I really enjoy the reading on this site.

I just ordered 200 rounds of 175g SMKs from http://www.southwestammunition.com

I've heard they are some of the best factory rounds you can buy. I was invited to a 900 yard range next week. I can't wait to go try it out.

Dusty · 07-09-2011, 09:25

Quote:

Originally Posted by Ramirez

Which would provide more accurate shots correct?

Thanks for the write up. I really enjoy the reading on this site.

I just ordered 200 rounds of 175g SMKs from http://www.southwestammunition.com

I've heard they are some of the best factory rounds you can buy. I was invited to a 900 yard range next week. I can't wait to go try it out.

Learn to read the wind.

**The Reaper** · 07-09-2011, 09:31

Surface area allows radiation of heat.

Greater surface area (and greater mass) equals faster cooling.

Formula for area of a cylinder (barrel) will show this.

Thicker barrels may be stiffer, but all have harmonics, and those will likely change as the barrel heats up.

Some shorter or lighter barrels may shoot just as well as a thick one for a few rounds.

For most rifle hunting, barrel diameter is probably irrelevant. For a belt fed, it is critical.

TR

GratefulCitizen · 07-09-2011, 18:52

Quote:

Originally Posted by The Reaper

Surface area allows radiation of heat.

Greater surface area (and greater mass) equals faster cooling.

Formula for area of a cylinder (barrel) will show this.

Thicker barrels may be stiffer, but all have harmonics, and those will likely change as the barrel heats up.

Some shorter or lighter barrels may shoot just as well as a thick one for a few rounds.

For most rifle hunting, barrel diameter is probably irrelevant. For a belt fed, it is critical.

TR

Painted the block and tinware of my hotrod's engine flat black because of the better thermal emissivity.
It assists in cooling.

Curious to know if such things have been done with machine gun barrels.
(Not sure if non-insulating paints are made which will stay on in those temperature ranges).

Ramirez · 07-09-2011, 18:53

Quote:

Originally Posted by Dusty

Learn to read the wind.

That's something I try and do every time I walk outside of the house. I need to pick me up a wind meter, to see if my guesses are right. You should see my wife laugh at me. The wind will pick up and i'll be standing there like a tard. She says it looks like I was lost in thought.