JSB Exacts at $64.99 USD per sleeve of ten, $16.47 for shipping. JSB Match Diabolo's are $54.99. Slightly lighter (8.26 gr.) and a wad cutter style. Even with the buy 3, 4th free from Pyramid, it would have been almost $80 for pellets, shipping additional. And take what they have (if they have anything in stock!), no choice in head diameter.
Maybe the latter isn't a big deal, but I keep hearing comments about the oversize Gamo barrels, so this seem like the best way to do some careful, objective testing to see if there's a quantifiable difference. My intent is to test for both accuracy, and velocity. I'm expecting to see some correlation between head diameter and accuracy, as well as velocity, but I haven't totally worked out my testing regimen yet, so suggestions are welcome. My current thought is, chrono testing at muzzle (3 ft.) and 20 (?) yards, accuracy testing at 20 and 40 yards. I may see if I can come up with a 2nd chrono, so I can test velocity and 20 yard accuracy simultaneously. But like I said, suggestions are welcome. This is obviously not going to be a project to be done in one sitting, I expect it to take me several days, and lots of pellets, before I have all the data I'm after. And there may not be enought difference to warrant all the time and energy. But that's okay, it's still a great excuse to do lots of shooting, and maybe the info will be of use to someone else. And regardless, I'll KNOW what works best for ME in MY gun.
Sorry I got so long winded, guys, I just realized the original question was "HOW much?". Later.
Dave