Home Forums Hunting & Shooting Long Range Hunting 6.5-06/140gr vs 270W/140gr on deer out to 550yds.

I know QL charge-to-velocity is not always accurate. No surprise with all the variables in guns and components.

I was looking at the QL calcs from the pressure-to-velocity correlations. That's how I use it nowadays. Then I ladder up over the chrono, stopping where chrono velocity correlates to the 60-62K pressure calc.

Anyway, sounds like you have tested results, where I'm just making conversation/speculation.

Re: original ?, I think both are up to the task, when a good bullet is threaded thru vitals. Something not just any shooter can do, but many can learn w/practice, and an LRF, wind being your biggest hurdle perhaps.

Well, I'd sneak a little closer.

Both of you always seem pretty solid.

MontanaMarine,

That's generally how I use QL as well anymore, on the rare occasions I use it. I much prefer to use pressure-tested data, though!

In regards to the original question, the .270 will be capable of a little more muzzle velocity, which pretty much compensates for the difference in in BC out to 550.

When working up loads for a 'wildcat' like 6.5-06, does one typically base pressure limits etc. on 'similar' cartridges with SAAMI specs? Such as the .25-06 or 270 Win in this instance?

Hence the reason I sold a bunch of wildcats and loaded 500+ rounds of the Hornady 140 BTSP over 58 grains of H4831 SC for my 270 and just called it good.

I wish I could shoot well enough that the difference at 500 yards would make a difference.....

deadkenny,

That's apparently the way Nosler and Hodgdon worked their loads up.

Another way to load for wildcats is to extrapolate from data for similar rounds. In this case, the .270 Winchester would be the easiest, since there's abundant data for 140-grain bullets.
The laws of internal ballistics suggest that the 6.5/06 is capable of about 97.5% of the velocity of the .270 with the same bullet weights.

Most .270 data doesn't list 140-grain loads that get 3000 fps in a 24" barrel. Most list a top velocity of just under 3000 fps. Barnes, however, lists several loads that top 3000, the fastest 3050 (IMR4831), which translates to 2974 for the 6.5-06.

One faster possibility, though, is Accurate MagPro--though their data doesn't include a 140-grain bullet. With a 130 it lists 3234 and with a 150 a flat 3000 fps, which means that a 140 should get around 3100. That would work out to around 3025 in the 6.5-06.

The 6.5-06 and 6.5-284 are pretty much ballistic twins based on bore and case volume. Load data should be pretty close.

In my 6.5-06, I am running RL22 and RL25 under 140 Berger vld bullets. On a wounded antelope buck at 530 yards laying prone and finishing it off before it made it under a fence, the berger did a perfect job and dropped it in its tracks. It was going to die from a buddies shot, just not fast enough.

On my doe at 498 yards, I dialed the cds and when she stopped to look back, the berger just slammed her down.

On my antelope buck at 220 yards, I clipped the back edge of the front shoulder, lost 2 pounds of meat and put him down in 5 yards.

On my mountain goat at 200 or so yards, it was dead right there with about half a front shoulder lost.

I cannot imagine telling a difference between the 270 or the 6.5-06 however I am completely sold on the speed and accuracy of the Leupold CDS system.

Got two more tags for plains deer in December and hope to have more results to post.

Yeah, that's what I decided after doing an article on both rounds, chambered in otherwise identical E.R. Shaw rifles. Case capacity was the same, as near as I could measure it with water, and ballistics were just about identical with the same powder charges and bullets as well--though each rifle slightly preferred different bullets and powders.

moosemuncher,

What sort of accuracy are you getting?

Using the 140 Vlds, I got 8 rounds in .6" at 100. At 550 still holding very close to half moa. That out of a 6.25 pound rifle with a #2 hart off bipods. The buck at 530 I am very proud of as that was prone with no sling or bipod, just had time to range, dial and shoot.

Excellent! Thanks for the info.

Great stuff gents...thanks for taking me to school I appreciate it

The 243 is a wonderous 550yd+ chambering.

550yds is pretty close in................

Stick,

What are you loading in the 243 to reach out?

105 A-Max.

Their .505BC is real,as are the terminal affects. Rather sumptin'................

Any other load and rifle data?

I'm looking for a long range deer load....