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Gateway To Product Reviews => Pellet Reviews => : TCups September 12, 2008, 01:08:17 PM
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Weighed to the nearest 0.05 grains, here are the spreads on 1000 SuperDomes, 1200 JSB Exacts and 1000 Beeman FTS in .22, .20 and .177 cal, respectively.
Superdomes: 14.55 grains
Beeman FTS: 8.75 grains
JSB Exacts: "not exactly" 13.75 grains
SuperDomes and Beemans FTS had harder lead and very fewer skirt deformities. Both seemed to have some type of topical dry lubricant.
JSB Exacts were softer lead with thinner skirts, more than a few of which were visibly deformed. They were duller in finish with no apparent lubricant.
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Tommy that sure paints a clear picture about the range of weights in a tin or box of pellets. Your scale is very fine enough too. I salute you for the time it took to weigh 3200 pellets one at a time. It is an achy chore but you got a lot of fruit to work with now.Part of your testing should now be comparing groups unweighed vs.matched weight as well as one matched group vs. another. You're gonna' need several containers I see.I don't do much weighing and sorting anymore except on special occasions.Wears me out.
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Kind of mindless, but not too bad, actually. Done over a week, while listening to Rush mostly (how sad is that for vacation time? But I was drinking beer. . .) And yes, I now have a ditty bag case w/ individually sorted boxes of a thousand rounds of each of my favorite pellets ready for the next time I shoot groups, or chrony test a rifle, or both. BTW, like my digital calipers, the zippered nylon case holding 5 plastic parts boxes w/ 18 bins each was a gift from my even geekier bro, Jerry specifically for me to store pellets in. Probably came from Harbor Freight, if I know him. Great way to store and transport sorted pellets in bulk. Kind of like the boxes used for fishing flies, only heavier and for shootihg (lol). Well, OK, maybe he isn't geekier than me.
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Glad to see you found a good use for those plastic cases. ;-) Remarkable to me that the JSB exacts vary so much. Makes you wonder how uniform they might be in rotational moment.
I don't think I hold a candle to you in terms of your determination to analyze to exactitude of your hobby interests. Fly fishing, hunting, golf clubs, tennis rackets, airguns - but it relates to being the absolute best at manipulating and analyzing images then making judgments about them - and that's been pretty successful for you...
Now is there a way to analyze the ballistics of a spinning pellet? Is that covered in one of those books you found in England about airguns?
Straight ahead, brother!
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Roll them on a piece of glass by gently blowing on them. The tighter the radius of the roll, the larger the skirt relative to the head of the pellet, and the tighter it will fit in the breech. On glass, any wobble or irregularity of the roll is not good. The book describes a method of embedding the pellets in wax, cutting out a cross section through the middle of the pellet profile, magnifying the silhouette of the pellets profile and cutting out a cardboard copy. Then hanging the cut out from the reward edge of either side of the skirt, a plumb line is dropped vertically. Where the two lines cross represents the center of gravity of the 2-D cut out. Presuming the pellet is uniform, it should represent the 3-D location of the COG. The further forward the COG toward the head of the pellet, the more stable the pellet is likely to be in flight. Easy!