The Accurate Reloading Forums
How much difference is 15 foot pounds in energy?
26 February 2004, 09:27
urdubobHow much difference is 15 foot pounds in energy?
Would you consider 15 foot pounds a big difference in balistics? Would 15 foot pounds of energy make you pick one cartridge over another?
Respectfully,
Urdubob
26 February 2004, 09:39
Fjold15 foot pounds of energy is insignificant. It's less than the variation that you will get between each round from the same load.
26 February 2004, 10:05
urdubobOh...ok, according to Remington The 45/70 405 grain has 1590 ft/pds and the 20 guage 2 3/4" 1/2 OZ. slug (slugger hv) has 1575 ft/pds
So these two "Average" cartridges are the same.
15 foot pounds seperate the 45/70 and the 20 guage slug.
Thanks for your help,
URDUBOB
26 February 2004, 10:59
AtkinsonI could catch that in my teeth...
26 February 2004, 11:01
CarmeloQuote:
I could catch that in my teeth...
Your catching something in your teeth alright, I bet they are about 6 inchs and shoot.
C
26 February 2004, 11:02
jrslateGentlemen,
Just for the boring scientific description, the difference is equal to the force of a 15 lb. weight falling one foot...
26 February 2004, 11:03
BrentQuote:
I could catch that in my teeth...
Stop by Ray and I can arrange a little game of catch for you.
Brent
26 February 2004, 11:05
WillFor the record...it is 30 ft-lbs divided by 2.
Sorry.
26 February 2004, 11:06
CarmeloQuote:
For the record...it is 30 ft-lbs divided by 2.
Sorry.
Don't lie it's more like 3 1/2 inches! hahaha
C
26 February 2004, 11:26
odieWell to take this banal inanity oh so much further.
According to Remington a 12 gauge 385 gr. Core-Lokt Ultra Premier Bonded Sabot Slug generates 2682 ft.lbs. at 100 yards. According to Remington also, a .375 H&H 300 gr. Swift A Frame PSP at 200 yards generates 2608 ft.lbs.
So for those of you that bemoan shooting buffalo at 200 yds., get the same thrill using a 12 gauge at 100 yds.
Think of it, if Remington puts this thing in a 10 gauge it could well become the new African standard DG weapon.
26 February 2004, 11:43
BFaucettWell, to be fair to the ol' .45-70, the factory loads are pretty anemic and low pressure. With a good handload, things are a bit different. A 400 gr bullet at 1900 fps gives about 3200 ft lb of muzzle energy. At 1800 fps it's about 2877 ft lb. 1800 to 1900 fps should be attainable in a modern lever action; certainly in a Ruger No.1. Now, I'm
NOT one of the .45-70 for dangerous game advocates but the pro .45-70 people are talking about loads that are above the factory standard ballistics.
Please, no flames. Just trying to be fair and accurate.
-Bob F.
27 February 2004, 22:31
Safari-HuntDear UrduBob,
I cannot help to notice that you are still going on about the 45/70.
I do hope that you have got rid of yours by now
If I get you here at Joburg international with a 45/70 in your hands unless you want to give it away I will be sending you home on the next plane back to Atlanta.
As far as I'm concerned you have a 416 so don't bother with the rest
28 February 2004, 04:24
Jim in Idaho15 ft/lbs at the muzzle is nothing. You will get several times that variance by the difference in mv of the same loads fired in the same rifle.
However - you WILL notice 15 ft/lbs of energy difference at the recoil pad. Not enough to scare you away unless you are up in the 40-50 ft/lb range already.
28 February 2004, 04:50
.4415 ftlbs is insignificant.
Next you must look at bullet construction.
Then you have to look at it's momentum.
Then sectional density.
Then frontal area of the round.
in that order, if all are equal or near then yes the two rounds are similar.
28 February 2004, 05:15
jeffeossohmmm, i aint gunna bother with the math, but this is close..
in terms of a rigby, with a 400gr... that's a WHOOPING FOUR fps
5# bag of sugar...
falling 3-4 feet... like off the counter...
15 ftb/lbs...
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