I've got a riddle about aparent pathetic velocity

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fuzzynuts54

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So as I do a google for 208gr amax's, h1000 and the .300win mag everyone has these wild velocities. The average seems to be 2850-2950 with 77 grains of h1000 out of 24" barrels. One guys even claiming 3000fps with 75grains although it out of a 26er.

Howcome I'm only 2713 to 2753 with 77grains (computed by 2 load data and ballistic programs). Are these people f.o.s.?
 
I get 2950 with 200 grain Accubonds and 78 grains of H1000. I don't see any particular reason why it wouldn't meet that 2850-2950 window with a 8 grain increase in bullet weight. Granted mine is a 27" Lilja not some corrigated 24".
 
Maybe not: US Army's get 869 m/s (2,850 ft/s) with MK 248 MOD 1 Sniper load (220 gr SMK) from a 24" barrel.
This implies that 2,910 ft/s should be possible from a 24" barrel and 3,000 ft/s might be possible with a 27-28" barrel.

In any case, 150 ft/s is only 50 yards more in effective range and you not sweat about this and focus on getting top accuracy.

Alex
 
Hmmm. Well I've yet to chrono this loaf yet, these estimates are being computed via the poi compared to my known chrono'ed load. Even at 79grains there is zero pressure signs, infact it seems as if the pressures are lower than my 77gr of imr 4831 with 150gr smk. It that possible?, I'm not lucky enough to have an internal ballistic program yet.

I am looking for best accuracy, however settling for a seemingly low velocity doesn't sit well either. I may hunt for another node if the signs alow me.
 
I tend to treat other peopls claims about their load speeds with the same amount of deference as I do fishing stories. Especially when it comes to people posting on the internet.

Lots of people don't bother with chronos and estimate their load speeds from extrapolating data from their loading manual, and that just isn't reliable at all. Good ball park, but not really useful. If you aren't shooting long distance, then speed does't really matter as much IMHO.

My 300 WSM and 67 gr of R22 shoots 210 SMKs at about 2850, maybe 2900 on a hot day. I have a 26" barrel. So to hit 3000 FPS out of a WM, sure, its quite doable, but would make for one heavy load.
 
I have a 24" barrelled factory 308 Norma Mag, which is very similar to the 300 Win Mag, ballistically.
My pet loads in this rifle is 78 grains of H1000, or 77 grains of RL25 behind a 200 Accubond.
My chronograph [15' away] reads very similar velocities for the two. 2940 - 2960 fps
The RL 25 load has a slight accuracy edge, but both loads shoot very well, and are quite flat right out to 500 yards. [+3 at 100 = -27 at 500 on actual targets]
Eagleye.
 
I chrony 200 grain bullets in my 300 win mag ( it is a P14 and I use .311 bullets) at about 2975 with a 25 inch barrel. I use CF7900 powder that I bought from Higginson years ago. I have no experience with the powder you are using, but I have no problem with this velocity, except that a moose will not step out when I am carrying it, so I have not seen what it will do...
 
fuzzynuts54 said:
Hmmm. Well I've yet to chrono this loaf yet, these estimates are being computed via the poi compared to my known chrono'ed load. Even at 79grains there is zero pressure signs, infact it seems as if the pressures are lower than my 77gr of imr 4831 with 150gr smk. It that possible?, I'm not lucky enough to have an internal ballistic program yet.

I am looking for best accuracy, however settling for a seemingly low velocity doesn't sit well either. I may hunt for another node if the signs alow me.
Click to expand...

I don't think that is an accurate technique for estimating velocity. You need to run them through a chronograph.
 
I'm just screwing around out of curiosity. I was doing some load testing, found a load that I am going to fine tune. I had my chrono setup but it wasn't functionng thanks to the overcast sky. I will chronograph it next time I get out.
 
Jordan Smith said:
Some barrels are slower than others. That's another factor in the equation.
Click to expand...


I completely agree with this.
I have many times shot two different rifles of the same caliber, barrel length, load recipe. Some barrels are just faster.
I have seen over a 100fps difference between identical guns.

But it dont mean much at all.
Load your rifle to its individual potential, and shoot.
Thats where the fun is.
 
Ganderite said:
I prefer to find an accurate load and then just lie about the velocity.
Click to expand...

FTW. I bet the animals won't notice 100fps difference.


Jordan Smith said:
Some barrels are slower than others. That's another factor in the equation.
Click to expand...

+1. Even quality aftermarket barrels show 50-100fps between supposedly identical set ups. I wouldn't worry too much about it. OP's barrel may just be on the slower end of the scale.


Mark
 
mmattockx said:
FTW. I bet the animals won't notice 100fps difference.
Mark
Click to expand...

This is a very true statement!
Many years ago, I developed a load out of a manual, using long obsolete
Hodgdon H205 powder.
The book said my 7x57 load, using the 154 Hornady RN
should be going about 2750 fps.
I shot quite a bit of game, using that particular load, since it was very accurate.
Even shot a couple of moose with it, one at 200 yards.
Imagine my surprise when I acquired a chronograph and clocked that load
in that rifle.
It just made 2450 fps.
Game didn'r seem to care.
I had noticed the drop figures did not quite add up, but attributed that to the RN bullet, with it's lower BC.
Just shows that velocity, while it is nice to have, is not everything.
Regards, Eagleye.
 
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