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how much more muzzle energy am I getting out of a longer barrel?
I have a rifle chambered in .500 S&W Magnum, I'm wondering how much more muzzle energy I'm getting out of a 20" barrel over a pistol with a 8.75" barrel?
Wikipedia's muzzle energy table for the 500S&W is for a revolver (pistol) barrel of 8.75". Lacking a chronograph and a local range to shoot at to figure out for myself, anyone know how much more velocity do I get on average out of a 20" bbl rifle with these 3 kinds of ammo:
Winchester Reduced Recoil 350 gr JHP
1400 fps @muzzle (w/ revolver bbl)
Hornady 500 gr polymer tip (10" bbl)
https://www.hornady.com/shop/?page=ballistics/popup&product_sku=9252
hornady 300 gr jsp (10" bbl)
https://www.hornady.com/shop/?page=ballistics/popup&product_sku=9249
thanks!
Ok using a ballistics calculator I added 200 ft per sec which is roughly the added velocity you would gain from a 20” barrel and I ended up with 3448 ft lbs of energy from a 300 gr bullet traveling at 2275 ft per sec.
With the 500 gr bullet traveling at 1625 ft per sec I came up with 2932 ft lbs of energy.
http://billstclair.com/energy.html
Please note that you might get more than a 200 ft per sec increase with the 300 gr in a 20" barrel and maybe less with the 500 gr bullet.
The Folding Rule - Wine Barrel Table - Part I