10 Mar 2007 22:49:25
PrimoMelon
Springer Pellets Hope This Helps

uns - Pyramyd Air Report

Monday, February 20, 2006
Best pellets for the Diana RWS 52 & how to pick pellets for any springer

by B.B. Pelletier

On Friday, we received a comment with several questions that I'd like to
address this week. The first concerns selecting the correct pellets for the
Diana RWS 52. I'll talk you through that and generalize for most springers -
so you'll be able to pick great pellets on your own. The comment we received
included the following, "...could you offer an explanation as to why some
pellets are seemingly more accurate than others? And I am using heavy weight
pellets, could you comment on the value of using heavy vs lighter ones in
this air rifle?

Heavy vs light pellets
In a spring gun, the piston travels all the way forward and comes to a stop
before the pellet starts to move (that's the way it's supposed to work). If
you use a very light or very loose-fitting pellet, the pellet can start to
move before the piston stops. When the piston comes to a stop, it does so
against a thin cushion of highly compressed air that separates it from the
front of the compression chamber. That cushion protects the piston seal from
impact damage. Sometimes, the piston will rebound off this high-pressure air
cushion just as the pellet starts to move forward. If it bounces too far, it
will lower the air pressure and rob the shot of potential power.

From the standpoint of efficiency only (accuracy not considered), the best
pellet for a particular spring gun is one that starts to move at the moment
the piston comes to a stop. That allows the piston to settle softly against
the end of the compression chamber as the air pressure drops. Now, how do
you determine which pellet that is?

You use a chronograph to determine which pellets give the greatest power in
your gun. We've discussed this before, and you now know that spring guns
favor lighter pellets (this is the reason why). Light pellets work better
because they start moving sooner. Springers like that because they don't
have a large amount of compressed air to work with. Are only light pellets
good for springers? NOT AT ALL!

You must consider accuracy!
Power without accuracy is a waste of time. The goal is to combine the best
accuracy with the best power in a given gun. A short-stroke action like one
of the RWS sidelevers tends to extract more power from the lightest pellets,
while a long-stroke action like the Diana RWS 350 Magnum probably likes
pellets in the medium-weight range. Try them also for accuracy to find the
absolute best pellet. While 7.0-grain RWS Hobby pellets may give the most
power in a .177 RWS 52, it may be that 10.5-grain Crosman Premiers are more
accurate. Shoot the heavy Premiers and forget the 1.5 to 2 foot-pounds of
greater power the Hobbys might deliver in that rifle.

Incidentally, a Diana RWS 52 in .177 is capable of sub-1" five-shot groups
at 50 yards. At 35 yards, a good shooter should be almost able to keep all
his shots on a dime. That's shooting on a calm day from a rest and resting
the forearm on the flat of your open hand. Your trigger-finger hand does not
hold the pistol grip any tighter than necessary, and the butt is not pulled
into your shoulder. If there's a scope level on the rifle, check it before
each shot. If you grasp the rifle's stock in any way, you can forget that
level of accuracy.

Can the wrong pellet damage the rifle?
There isn't much information on this subject, but I believe the wrong pellet
can injure a spring rifle. I think shooting a pellet that is either too
light or too loose is similar to dry-firing the gun. I know Gamo says their
guns can take it, but I still do not like doing it. Very light/very loose
pellets can also cause explosive detonations, and we are pretty sure they do
damage the mainsprings. Diana RWS guns have very hard mainsprings (maybe a
touch too hard), and they're most susceptible to damage caused by
detonations. I have fixed several Diana RWS guns that had one inch broken
off at one or both ends of the spring. Those guns will keep right on
shooting, but they show a distinct drop in velocity.

What about real heavy pellets?
Some people feel heavy pellets also damage mainsprings. I don't believe this
myself, but as I said, there isn't much to go on. Another problem with
pellets that are too heavy is that they don't stabilize well enough for good
accuracy at longer ranges (beyond 40 yards).

Do I have to test EVERY pellet to find a good one?
No! I addressed this on several occasions in past postings, but the best one
is Best pellet of all? posted on August 19, 2005. Read that and also use the
Bloglines search engine on this blog to look for other pellet postings.
Testing every pellet is a waste of time and money, since many of them don't
work well in ANY airgun. I also have a rule of thumb that I follow: RWS
airgun, RWS pellet. Do that for all manufacturers; it works a lot of the
time.

Here is what I have not answered with this posting: Why some pellets are
more accurate than others. I wish I knew the answer, but I don't. I also
don't trust anyone who says they do. I do know that pellets that have been
sorted by weight usually out-perform those that haven't been, and JSB
pellets are all hand-sorted. That's why I believe JSBs are often the most
accurate pellets


10 Mar 2007 22:11:52
Honest John
Re: Springer Pellets Hope This Helps

Thank you for the info,
sounds like this fellow knows his stuff.
Sounds like the guys that sold me most
of my air guns over the years don't know their stuff.
Sounds like I have said a few things here that
might not be totally true, I am sorry if I have miss-lead,
but I am happy to stand corrected.
Look at that, I am over 40 and still learning.
--
John




11 Mar 2007 13:20:47
NoNameLurker
Re: Springer Pellets Hope This Helps

> Look at that, I am over 40 and still learning.

The day I stop learning will be the day I die.

Lurker


11 Mar 2007 17:26:59
Dave
Re: Springer Pellets Hope This Helps


"NoNameLurker" <[email protected] > wrote in message
news:[email protected]
>> Look at that, I am over 40 and still learning.
>
> The day I stop learning will be the day I die.
>
> Lurker

Never stop learning that reminds me of a joke ... a bloke is walking along
the beach in american he's pondering his life and thinking how good a
christian he's been etc, he says "I wish for once God would grant me
something I want" The heavens open and a voice booms down "Abraham my
faithfull servant what do you want?" Abraham thinks a minute and says "Lord
I go on holiday to Hawaii each year with my family, I'd like a bridge across
so I can drive over when I want," The voice booms down "Abraham my son that
is too great an undertaking even for me, think of all the concrete the steel
the disturbance to the ocean creatures and the shore creatures, isn't there
anything else you would like?" Abraham thinks a minute and says "Yes Lord
I'd like to know how a woman thinks, how she feels what to say and do to
make her happy"
Gods voice booms down again "OK Abraham how many lanes you want on this
bl**dy bridge?" :O)




20 Mar 2007 12:33:34
Re: Springer Pellets Hope This Helps

On Mar 10, 11:11 pm, "Honest John" <[email protected] >
wrote:
> Thank you for the info,
> sounds like this fellow knows his stuff.
> Sounds like the guys that sold me most
> of my air guns over the years don't know their stuff.
> Sounds like I have said a few things here that
> might not be totally true, I am sorry if I have miss-lead,
> but I am happy to stand corrected.
> Look at that, I am over 40 and still learning.
> --
> John

I'm over 64 and still learning......................
It's just that you have to whack me on the head a little bit
harder lately to get my attention.

MadDog

"Outside of a dog, a book is a man's best friend.
Inside of a dog it is too dark to read." - Groucho Marx