Berber
Member Extraordinaire
Yes, Spitfires are available, but not the old fluted body type. Technically, the 100 pellets is a sound way to go, but not really practical if you are testing 20 odd different pellets. I have found that 10-15 pellets is normally enough for leading in, less if you are moving from soft lead to soft lead. So, for example, JSBs are basically all the same lead mix, so no need to lead in when changing between pellet weights, QYS are similarly soft, and I have found switching between JSB and QYS, 5 pellets is enough. Moving on to RWS the lead mix is a bit harder. Going from soft to hard, you don’t really need to lead in, but going the other way might take 10-12 pellets before the groups start to tighten up.This is precisely the kind of thing I mean when talking about the apocryphal or anecdotal "facts" that we have kicking around the hobby.
I have absolutely zero idea on how one could possibly even test the number of pellets required to "lead in" - and equally I've heard from very experienced shooters that they found that this is much more true of RF/CF rifles than of air.
Maybe in a few years when I've got access to more machine tools, then I can go about designing an experiment to study this "leading in" hypothesis. But from the comments here, I've already noted several weaknesses in this study alone - so clearly I've just cracked open a can of lifelong research
Do they still even make Spitfires? I don't think I've had a tin of those since I was a whelp!
Most of the other pellets I have tested are harder still, (Geko, Crosman, Shocks, BSA and a load of others.) For everything apart from soft-soft and soft-hard lead, I allow 10-15 pellets.
As stated above, knowing which are the “same but rebranded” is useful if you are testing as you wouldn’t need to lead in all the time. I am one of the saddos who have weighed into groups, then tested 20 odd different pellets to find what suits. You never know until you try, and I found that Victory Shocks are an acceptable substitute for Baracuda FTs in my Mito, but give 1-2mm larger groups. However, they are much cheaper, and fine for practising or plinking.
Similarly, my AA S200 shoots 2-3mm larger groups with swaged Crosmans than QYS heavies, so fine for practise, and much cheaper.