Factory ammo chrony results

Hi
I had a chance yesterday to run some factory ammo over the chronograph results as follows.
Sauer 100 7mm08 16.5inch barrel

Federal power shock blue 150gn
2401,2428,2400,2431,2415

Remington corelokt 140gn
2370,2465,2465,2588,2531

Hornaday superformance 139 sat
2501, 2572,2602,2613,2651,2609

Now I don't have much experience with these things but that is quite a large differences with the same ammo

I shot each string with 10 minutes to let the barrel cool in between also had a small rest every 3 or so shots while I checked the groups.

I've decided to use the hornaday even though the Remington grouped better because the calculator says the higher bc and mv will allow me to shoot 200 yards further and retain energy.

Bit of an eye opener aye, the factory velocities are often inconsistent and always overstated.

Short ass barrel I was expecting velocity to be low but not the inconsistency

@muka88

In the Hornady add it says :
'Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy'.
It does NOT allow you to shoot 200yards further.
With a short barrel you are pushing the limits with a 400yards shot and using factory ammunition.
But most shots are within 100yards anyway.
If the Hornady ammunition doesn't shoot within 1" @ 100yds you have to consider where the projectile hits at 400yds, which could be a miss or bad shot.

They normally state the barrel length it was tested with - often its 26inch
Of course altitude and pressure, temp etc have a effect too

If you enter the average 2600fps into the ballistics calculator it says that it will retain 1000ftlb of energy out to 500meters

I wouldn't worry to much about what hornadays marketing team says about it they are likely full of shit like everyone in that game haha

I'm working in yards sorry 500 yrds

You either use Standard or Metric.
When you put 2600fps in, and your calculator says you retain 1000ftlb the distance shown is Yards not Meters.

I should use the refresher button:)
I just see your last reply.

I know the difference between metric and imperial just a mistake writing the post and the hornaday app will allow to receive information in meters even if you input fps

It was my mistake

G'day,

Have you thought about a lighter pill? Perhaps another federal offering seeing as they had the least variance?
The federals were obviously the slowest and heaviest but more importantly had the smallest standard deviation.

If your looking to stretch you rifles legs there are a few key things to be looking for/doing IMO.... 1. Obviously accuracy. 2. Velocity Standard deviation. 3 verifying dope. 4. Identify Max effective range to be pretty darn sure your gonna put a beast down. 5. More practice than I manage. (Missed a few additional learning g the lessons)

In saying all the a 16.5 inch 708 sound like the making of a fun, light, little bush gun!! [emoji12]

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Yeah federal do a fusion 120gn that has some good reviews.
It's a expensive business buying a box of everything trying to find out what a rifle wants

Quote:

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Originally Posted by diana2

@muka88

In the Hornady add it says :
'Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy'.
It does NOT allow you to shoot 200yards further.
With a short barrel you are pushing the limits with a 400yards shot and using factory ammunition.
But most shots are within 100yards anyway.
If the Hornady ammunition doesn't shoot within 1" @ 100yds you have to consider where the projectile hits at 400yds, which could be a miss or bad shot.

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Hornady sp ammo is going faster than standard. So from his results a 139 sst going 2600 will have enough energy to do the job to 450 yards if you go with the fact you need at least 1000 ftlb.
If you used another projectile(same) in the same weight but was going 200fps slower, ie 2400fps then to get the same results in energy it will only be 350yards for the min 1000ftlb so the extra speed is giving you more energy at distance and in this case extends the range by 100 yards.
All test barrels are normally 24 inch, if the 139sst were going the 2950fps as stated you have plenty of energy to do the job past 500 yards

Once you’ve got some brass, go down the reload path with a friendly reloader. You won’t look back.

After using factory loads in my rifle for years, the improvement in accuracy with hand loads, was just phenomenal. Clover leaf at 100m. I’ve never achieved it before. Very very happy!

Yeah I probably should reload don't have a lot of spare time though ,.when I get some I like to go out for a hunt or get the boat out

Quote:

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Originally Posted by muka88

It's a expensive business buying a box of everything trying to find out what a rifle wants

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Don't Gunworks do 15 projectile sample packs of most types? :)

Re read my own reply. I've never cronographed a selection of factory ammo before so find your results quite interesting and a bit suprising actually. Aside from chronograph accepted variances, I Probably understated my own penance for standard deviation in velocity if you are indeed wanting to test yours and your rifles capability at distance. Personally the velocity spread (150fps) of the Hornday your going with wouldn't be 'kosher' for me, that sort spread will be a pretty big deal down range when it comes to elevation. I'd keep searching if I were in your shoes. It's all practice mate. Yeah it costs, But it's fun too...

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I had thought that maybe the first reading may be effected my the change in bullet composition sst was the last lot I tried.
Is that a thing?
This bulistic stuff is complicated Haha

Quote:

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Originally Posted by bumblefoot

Don't Gunworks do 15 projectile sample packs of most types? :)

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Yep they do for bullets but not for factory loaded ammo.

il buy a reloading kit on the weekend.
are the lee ones ok?

Quote:

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Originally Posted by muka88

il buy a reloading kit on the weekend.
are the lee ones ok?

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My standard answer for this question is: Are you likely to be reloading for quite a few years, or are you testing the waters to see if it is for you?

If the answer is the latter, then the Lee kit is Okay. I found the scales a bit shonky - the beam would sometimes stick on the pivot - potentially dangerous.

If you know it's going to be a long term thing then buy a really good press and a good set of beam scales. Then spend a few bucks on the basic accessories (chamfer tool, loading tray, etc). Add die set and appropriate shellholder (Lee sets often include one) and away you go. You'll add other bits and pieces if you really get into it.

Or like someone suggested, get friendly with someone who is experienced and you'll learn loads. Or at least whether it's something you'll enjoy doing.

Have used a Lee Challenger Press kit since mid 80's for .308 and .223. Still going well,just don't expect to do high volume reloading in a short time.
Getting back to factory ammo, use whatever shoots most accurately in your rifle.In your case the Remington even though the Federal had the better extreme spread figures for velocity. Speed/range isn't everything,accuracy is. If target is too far away for ammo, get closer. That's what hunting is about.

Cheers guys , I think I may have found one of those friendly reloaders. so things are looking up hopefully get some dies on the weekend and crack into on his press, il let you know how I get on.
Anyone got a got a good load for 708 bush pig?