2 replies [Last post]
2506deerslayer's picture
Location: Nebraska
Joined: 12/24/2002
Posts: 118

I was just wondering how much more velocity you might get out of a 26 inch barrel vs. a 24 inch barrel, same cartridge same load. Is there anyway to calculate this?

Don Fischer's picture
Location: Antelope, Ore
Joined: 03/24/2005
Posts: 3206

Not really any way to figure it. I guess you could use one of the rules of thumb floating around. In that case it might be from 35 to around 50 fps per inch.

Location: Summit, IL
Joined: 10/22/2006
Posts: 706

Good thing to test also is see if you are already getting "full burn" with the current 24 inch. If you are then you are wasting money having a longer barrel put on. You would actually lose a little speed.

Good way to test is to take an OLD white sheet ( I say old in case your married..Dont wanna pee off the wife Brick Wall,) ) Lay it on the ground longways toward target, get in the prone position with the end of the barrel about 2 inches from the end of the sheet, and about 6 inches up. Let a round loose and see if there is powder on the sheet. If there is then you could either reduce powder charge or longer barrel. If there isnt then the only need for a longer barrel is if you want to increase your powder charge with the same burn rate powder, or if you want to go with a possibly slower burn rate for more pressure. Some calibres do better with a slower charge while some like a faster burn. Its all dependant on the rifles and calibres.

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