GTA
All Springer/NP/PCP Air Gun Discussion General => Air Gun Gate => Topic started by: Motorhead on January 17, 2012, 06:33:21 PM
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Was making a post on another AG forum and in reading what my response was ::) a little light bulb went off in my head.
Been talking about pellet length and accuracy on another thread here, and never gave much thought to where my brain is now looking ???
Makes me start thinking WHY Disco's and M-Rods so differ in there accuracy ?
*Well, my post referenced too above has me thinking there maybe something to HOW PELLETS get loaded and the perceived idea lighter pellets are more fragile at skirt than heavier ones ?
The post: Can't add conclusive input, but by design a spring loaded rotary magazine such as the P-M rods the skirts are getting beat on IMO :o
Either effect can be noted such as .... What came first, Chicken or the Egg ?
* You strip a pellet from magazine, as bolt probe pushes pellet clear of magazine the magazines smile pellet was just in rotates clipping the skirt of the pellet moving into barrel. Thin skirt pellets may take a hit and deform at the skirt edge impacted where as heavier skirt pellet may be unaffected ?
* Next loading cycle as bolt probe is retracted from an empty magazine position and clears, magazine rotates and NEXT pellet lightly impacts the stop giving another chance pellet skirt gets slightly damaged ?
** Once we are into a loading cycle each pellet chambered has had 2 episodes where the skirt could be or has changed shape :roll:
Think this is a pretty valid observation supporting SINGLE PELLET LOADING is ultimate accuracy is wanted .... No ?
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The great maker made the chicken first, which laid the egg, second. I'll say again here as I said in your other post "Heavier pellets are always more accurate than light pellets"? They buck the wind better. The skirts on light pellets tend to blow out or get deformed more often during handling or shipping and loading.
Sam :o
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It takes a lot less effort (wind or otherwise) to make a lighter pellet change course than it does a heavier pellet. Thats why heavier rifle bullets are better in dense brush. They travell straighter when acted upon by outside influences. You could deflect small hail stones with an umbrella, but if they were as heavy as bowling balls they couldn't be pushed off course as easily. As for the skirt damage; (someone correct me if I'm wrong here). Wouldn't most or all of any skirt deformation be negated the instant the blast of air expands the skirt to conform with the barrel and its rifling?
Richard
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yup when the shot is fired the air pressure behind the pellet forces the skirt into the rifling and barrel.. creating the seal beind the pellet..
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As for the skirt damage; (someone correct me if I'm wrong here). Wouldn't most or all of any skirt deformation be negated the instant the blast of air expands the skirt to conform with the barrel and its rifling?
Richard
I don't think so, air under pressure takes the path of least resistance and while the pressure once peaked and pellets moving may indeed expand skirt somewhat ? .... There would be IMO a fair amount of pressure loss as blowby that even if slight would change pellets velocity enough for it too effect POI ?
Maybe this subject off in how I am asking ?
What I am eluding to is same pellet with different manner of loading ( 1 at a time verses a magazine ) and thinness of pellet skirt effect in real world application have an effect ?
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When inflating a tire that has just been mounted on a rim, some air does indeed escape. But ulitmately the air causes the tire to seal against the rim, preventing any further escape. I think that the same applies to pellet skirts and barrels. At least to a considerable degree.
Richard
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Hey, Motorhead, I agree with ya and seem to be the only one...I am able to load H&N Rabbit Magnums in my magazines and they seem to feed no problem...but they shoot a shotgun pattern when loaded in the magazines...even at only 20 yards...2 inch plus group all over, some left, right, high, low...and sometimes dead center...
But when using the single shot tray, it's pretty much one hole groups...deadly accurate...
H&N Barracuda 21 gn is same thing either in magazine or single shot tray...JSB 18.1's the same...deadly accurate loading either way...
With MY gun, the magazines seem to mess with accuracy at least with the Rabbit Magnum pellet...Other heavier pellets were of course too long to fit in the mags, but pretty much anything I feed it shoots a nice group...except for a couple of tins of cphp's I got that are not consistant and won't shoot well in my break barels either...
I know individual guns are different, but with my gun, the magazines definitely are making a difference in accuracy with that particular pellet...
That single shot tray solves that though as long as I don't go heavier than the H&N Barracudas...
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One more thing can happen in a magazine, the pellet can get scratched by a burr and
And change poi. the damage could be deep enough to leave a notch cut in the skurt.
You could push some pellets through the mag. With a rod and check.
Mark