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Caliber & Bullet...really 2 posts in 1 lol

 
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  #8  
Old 01-22-2010, 11:58 AM
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Re: Caliber & Bullet...really 2 posts in 1 lol

Liltank, why would a 25-06 get better barrel life than a 6.5-06?
For that matter, why would the 25-06 be a better choice?

Lets run the numbers and see.

Using the lightest Vmax available in each, Hornady lists the following max charges for IMR4350 with 24" test barrels on both cartridges.

25-06, 75gr Vmax: 56.7gr, 3600 fps
6.5-06, 95gr Vmax: 52.3gr, 3400 fps

Doesn't quite fit your theory, "more powder= more heat+high velocities= limited barrel life."

Using the nosler drop tables, compare performance. The BC's are (75gr Vmax) .290 vs. (95gr Vmax) .365 so with a 200 yard zero, look at , the 25-06 has 57.4" drop and 1746fps terminal, and the 6.5-06 has 56.8" drop and 1927fps terminal velocity.

Looks like you get more for less with the 6.5-06 than the 25-06. Since this thread is about varminting, I've compared varmint bullets.

Consider the heavy for caliber bullets available in 6.5cal; the 6.5-06 will really shine over the 25-06.
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  #9  
Old 01-22-2010, 12:11 PM
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Re: Caliber & Bullet...really 2 posts in 1 lol

Quote:
Originally Posted by loaders_loft View Post
Liltank, why would a 25-06 get better barrel life than a 6.5-06?
For that matter, why would the 25-06 be a better choice?

Lets run the numbers and see.

Using the lightest Vmax available in each, Hornady lists the following max charges for IMR4350 with 24" test barrels on both cartridges.

25-06, 75gr Vmax: 56.7gr, 3600 fps
6.5-06, 95gr Vmax: 52.3gr, 3400 fps

Doesn't quite fit your theory, "more powder= more heat+high velocities= limited barrel life."

Using the nosler drop tables, compare performance. The BC's are (75gr Vmax) .290 vs. (95gr Vmax) .365 so with a 200 yard zero, look at , the 25-06 has 57.4" drop and 1746fps terminal, and the 6.5-06 has 56.8" drop and 1927fps terminal velocity.

Looks like you get more for less with the 6.5-06 than the 25-06. Since this thread is about varminting, I've compared varmint bullets.

Consider the heavy for caliber bullets available in 6.5cal; the 6.5-06 will really shine over the 25-06.
I stand corrected. Thank you. I've always considered the 25-06 a very efficient caliber. From what I read from this site, I guess I thought the 6.5-06 to be a barrel compared to the 25-06. My theory is sound though. Just have the wrong idea's on the cartridges. I guess I was thinking over bore issues. My bad. Again thank you for correcting me.

Tank
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Old 01-22-2010, 12:39 PM
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Re: Caliber & Bullet...really 2 posts in 1 lol

I had seen an article on the 6X47 Lapua for varminting on 6mmbr. The only problem is I was going to build the rifle on a long action and some people from here have said that I may have feeding issues. If I decide on the 6x47 over the others I'll just get a donor action and go from there. This project won't happen for awhile so I was just trying to get some ideas for possibly my next build. Thanks for all the advice and suggestions guys!

Brian
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  #11  
Old 01-22-2010, 02:08 PM
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Re: Caliber & Bullet...really 2 posts in 1 lol

Quote:
Originally Posted by Greywolf18 View Post
I had seen an article on the 6X47 Lapua for varminting on 6mmbr. The only problem is I was going to build the rifle on a long action and some people from here have said that I may have feeding issues. If I decide on the 6x47 over the others I'll just get a donor action and go from there. This project won't happen for awhile so I was just trying to get some ideas for possibly my next build. Thanks for all the advice and suggestions guys!

Brian

I use a long action donated by a 270 Win. now chambered in .308. The only feeding issues I have is if I don't pull the bolt back all the way to catch the next casing. That is the only feeding issue I have found with my set up. I just have to remember to be very deliberate in running the bolt.

Tank
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Matthew 7:13-14
"Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. [14] But small is the gate and narrow the road that leads to life, and only a few find it.

If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger

Friends don't let friends develop canonitis!-chucknbach

arguing over the internet is like the special Olympics....even if you win, you are still...special!
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  #12  
Old 01-22-2010, 09:40 PM
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Re: Caliber & Bullet...really 2 posts in 1 lol

Go with a 308 better barrel life and can shoot past 600yds ....
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  #13  
Old 01-22-2010, 11:02 PM
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Re: Caliber & Bullet...really 2 posts in 1 lol

no problemo, Liltank. It really was interesting for me too, running the numbers. Really, its a wonder the 6.5-06 never took off commercially...

As far as using a long action for a 6x47, that might be tough. Its a shorter casing than a 308 even, similar to a 22-250 case. Seems like the cartridges would tilt & bind in the mag box, but who knows. One way to find out, would be, test some 22-250 cartridges in a 30-06 mag box. Don't fire, of course, just try cycling. Maybe someone will step in and say this is a bad idea and unsafe, but I'm not saying trying to fire them, just put them in and try to cycle them out.

by the way, I wouldn't advise anyone to spend much time in a PD town with a 6.5-06 or a 25-06. With unlimited target opportunities, that thing would be hot in a heartbeat! If anything, a short string and then put it away and go back to the varmint rigs, 223's or 22-250's and such...

then again, I've heard its okay to get your barrel VERY hot shooting varmints, because that's what gunsmiths are for!!
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  #14  
Old 01-24-2010, 03:30 AM
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Re: Caliber & Bullet...really 2 posts in 1 lol

As a Rancher and long time Varmint Hunter............I've shot thousands of prarie dogs in the last 30 years. Majority of them with fast 22 CF's. Many, Many of them with 25-06 and light bullets. My farthest shot ever was 697 long paces with a 220 Swift. As an added bonus, I've witnessed many people shooting pasture pooches with alot of different calibers, 17's to 300's, some out to around 1500 yds.........maybe I can help.

Yes, the bigger bullets with higher BC's will perform better at long range when it comes to trajectory and especially wind drift.
Yes, the faster we push the bullets, and the more powder being burned; the shorter the barrel life will be.
The bigger and heavier bullets cause more recoil, bigger powder charges cause more recoil..........a few hundred rounds in a day is pretty comfortable out of a fast 22. Not so much out of the 25-06, even with light bullets!!!! The 6.5's with even heavier bullets, will probably kick even more.

I don't know how many dogs you have in the area where you'll hunt, but if there is alot.........recoil might be a consideration. It certainly is with me! I used to use the 22's for the majority of my shooting, saving the 25 for the windy days.

Alot of VLD or "Match" type bullets are not really designed to expand on very small varmints, But if you push them fast enough, some certainly will. Alot of the bullets in the 25 caliber and bigger aren't designed to be "varmint" bullets, and a bullet that doesn't expand can make a hit "appear" to be a miss.

Therefore, I am a proponent of the 6mm/243 calibers. Good varmint class bullets to choose from, better wind bucking ability over the fast 22's, and not as much recoil as the 25 or bigger calibers. Alot of shooting without cleaning or cooling will burn out any barrel, but keeping the MV below 3500 FPS seems to minimize barrel damage. The 6mm class of cartridges will push relatively high BC varmint bullets plenty fast enough.

Most serious prarie dog shooters I know consider re-barreling an expected and necessary expense of "doing the job". There is also the necessary expense of components. If you want to cut cost somewhere, I'd recommend it be in the components (by using smaller calibers with less powder behind them). Because at the end of the day, your shoulder and your wallet will appreciate it alot more.

The 6X47 Lapua is supposed to be a highly accurate, highly effecient cartridge. It is also supposedly capable of pushing "varmint class" bullet weights at very fast speeds. I am currently re-barreling my 220 Swift (after appox 5000 rounds) to a 6X47.

Hope this helps some.

Last edited by SBruce; 01-24-2010 at 03:36 AM.
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