Spring gun barrel length and velocity

docscoutjr

docscoutjr

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Hi All,
So basically I am trying to decide between the Diana 34 or the Diana 34 compact which is about 4" shorter in the barrel.
In the powder burning world I know for sure that shorter = less velocity. Now in the spring gun world I can't seem to find a definitive answer.
Anyone know for sure?
 
My Weihrauch HW97K has a 12 inch barrel. It specs out at 950 and 750 fps in .177 and .22 respectively. It comes with an attenuator which adds about 6 inches and still the total length of the rifle is 40 inches. I suppose Weihrauch did its homework on its 97 and for its powerplant, 12 inches is the ideal barrel length. Advantage of short barrel is shorter barrel time for the pellet, so less time for recoil and other movement to throw it out of aim.

I got both Original Diana 45 and a 1991 mfr Diana 45 (which is actually a 34 in a 45 stock) and both have long barrels, 20" IIRC. A bit long, IMO but works well since I like shooting with irons as well and the longer sight radius really helps accuracy. If it were me, I would buy the compact version and install a decent scope. 16 inches will still give good sight radius for iron sights.

Do both regular 34 and compact 34 have the same velocity specs?

BTW, for the .22LR rifles, internet research shows optimum barrel length for max velocity is 16 to 18 inches, depending on whether you use standard, high or hyper velocity ammo. Hyper needs longer barrel.
 
34 is a great affordable rifle, I find mine is as accurate as my tx and 97k. Finding an accurate shooting pellet that keeps a 177 in the 800fps ish is the sweet spot, mine shoots best with Match Kuglen.
 
For a springer the barrel length is actually pretty short to get maximum velocity. If the barrel is too long you actually lose velocity. There are a lot of variables but if you are over the 12" length a few inches won't make much of a difference if you are using a scope. If you are using the irons then the extra length gives a better sight plane. I would have to dig up some of the old simulations I made- but from my memory for my HW97 the pellet had achieved most of it's velocity after the first 6". PCP rifles are a different animal all together...
 
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