I see there are both flat base and dish base slug. Which would be most accurate and does it matter if dish or flat base. Does it make a difference on how the slug flies or what? Which shoot best from a fx slug liner?
Flat base vs dish base slugs.
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There is flat, dish, and cup. How they shoot really depends on the barrel and twist. If im not mistaken, the fx slug liners were developed for NSA dish base.
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For my impact mk2 25cal 70mm slug liner A, the nsa.250 flat base is what the gun prefers. I have just stayed with the 36.2 slugs because of accuracy and price they all did extremely well.
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I think the dish base slugs were designed to accommodate the bolt probe like a pellet. If the barrel is not chambered for slugs there could be a clearance problem.
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I never got any of the flat base NSA slugs to shoot in my dreamline. It likes the 29gr dish base a LOT tho.
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You won't likely find a consistent answer, it's so barrel dependant. I like a lot of others have tried a lot of different slugs. Mine likes the 34.9 NSA at 955 and Stoti gets the credit.
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Griffin slugs has a discussion ( griffinairgunammo.com scroll to the bottom) of flat vs cup vs dish base slugs on their website. They say that dish base moves the weight distribution forward to tolerate a slower twist rate, and also helps the slug grip the rifling and seal the slug in the barrel so it works better in airguns. Dish based slugs also weigh less, so you can use a longer slug for better BC in airguns with limited power ( same idea as the FX hybrids.)
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Experiments were carried out with hollow and filled in bases on shells in the 1970s. The hollow does change the aerodynamics, but not by a lot, mainly in the dynamic stability, which may not help with slugs if they are marginal with a solid base. It will not improve the drag and will only change the BC through the sectional density or stability changes. As said, a hollow base will move the CG forward, which will change the stability but should not significantly change the BC if the slug is already a good match to your gun. Making a slug longer does not really reduce drag, and may well have the opposite effect.
After the experiments with the shells, the hollow base was kept, but not because of aerodynamic reasons. The hollow was kept as it made it easier for soldiers to pick up the 100lb shells, not something to worry most folks with slugs.
After the experiments with the shells, the hollow base was kept, but not because of aerodynamic reasons. The hollow was kept as it made it easier for soldiers to pick up the 100lb shells, not something to worry most folks with slugs.
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Boat tails change both the drag coefficient and the stability if designed properly, and therefore the BC and the accuracy. If it is not done properly, i.e. too big an angle, too long a boat tail or a rounded edge on the base, then the air will either not notice there is a boat tail, so it is doing nothing, or when the slug yaws the air will suddenly see the boat tail and the stability of the slug will rapidly change with results on accuracy you can imagine. Most of the boat tail slugs I have seen have far too big an angle or too big a boat tail, probably because they look cool.
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Not necessarily smarter, just worked a lot on that kind of thing, so maybe more experienced.
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When the Patriot Javelin gen 2 slugs were being developed the testing seemed to indicate that dish based outperformed flat based in wind and turbulence while inside performance was virtually identical.
Is there any scientific reason that this would be the case?
Is there any scientific reason that this would be the case?
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My 25 cal carbine prefers dish base. The flat base groups are twice the size the dish base groups were.
Read and article on boat tails being shot out of high power rifle. Filmed in slow mo you could see a small cloud of gas escape prior to the bullet exiting the muzzle. The gas blast coming out prior to the tapered base exciting the muzzle was large. This means the bullet does not seal to the bore well.
Read and article on boat tails being shot out of high power rifle. Filmed in slow mo you could see a small cloud of gas escape prior to the bullet exiting the muzzle. The gas blast coming out prior to the tapered base exciting the muzzle was large. This means the bullet does not seal to the bore well.
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Still waiting for .25 . Dubber is .22 biased cause where he lives. .25 is as xlose to perfect in the air gun world. 6.5 is all I got to say bout that
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