Reply With QuoteAssuming a 5 grain pellet, 1000 fps would give 11.1 ft/lbs of energy
A more average 7.9 grain pellet yields 17.55 ft/lbs of energy
When one looks to purchase an air rifle stateside the power level is expressed in feet per second, with no frame of referance to the pellet wieght. Stupid? Yes, but thats the way its done. <img src="http://jsramsbottom.co.uk/bbs/e/icon_frown.gif" alt="Frown" width="15" height="15"><!--graemlin:-->
My question is if a .177 rifle is listed at 1000 fps with a light pellet, would that be about 13-13 fpe?
Assuming a 5 grain pellet, 1000 fps would give 11.1 ft/lbs of energy
A more average 7.9 grain pellet yields 17.55 ft/lbs of energy
US maufacturer's are obsessed with declaring their rifles achieve the magic 1000 fps. To do so they have to use the lightest pellet possible. Unrealistic? Of course...
Yes but if they used a standard pellet it would make a lot more sense than the way it's done over here.
Out of interest Gamo list a supersonic 177 over there. I've allways wondered if it makes the same sort of cracking noise a bullet makes as it goes allong.
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by A John:
Out of interest Gamo list a supersonic 177 over there. I've allways wondered if it makes the same sort of cracking noise a bullet makes as it goes allong.[/quote]
Hmmm... theoretically, but it's a much smaller projectile, so it probably wouldn't be very pronounced. I wonder if you'd hear it - the pellet might well be subsonic anyway by the time you got far enough away from the gun to separate the sonic crack from the sound of discharge.
Regards,
MikB
Trust me, you DO hear supersonic .177s when they go crack !
Try going to Straight Shooters website. They have actual velocity tests on many different rifles with the pellet weights and kinetic energy listed as well. They generally just carry the pricey stuff though so don't expect to find any Gamos or Tech Forces there. www.straightshooters.com
Generally when you see a velocity figure you should assume that it was done with the lightest pellet available and that it's still about 5% higher than reality.
Hi i'm from your neck of the woods-do you shoot round here?
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