Quote from: Bayman on August 09, 2021, 07:27:20 PMNice job Mike. I find the JSBs consistently make more power for their weight than any other brand. They usually have the smallest extreme spreads too. This doesn't always equate to being the most accurate pellet for the gun but it does help my ego lol. H&N 8.64 FTT can be more accurate in some of my guns, but shoot a good deal slower than the 8.44 Exacts even though they are similar weights. Definitely slower than 0.2 grains would suggest. The H&Ns fit tighter so that probably has a lot to do with the slower velocities and better accuracy.I have found that tighter heads in higher power springers get more power. Not less ! Resistance means higher pressuresare developed behind the pellet before it starts moving down the bore.
Nice job Mike. I find the JSBs consistently make more power for their weight than any other brand. They usually have the smallest extreme spreads too. This doesn't always equate to being the most accurate pellet for the gun but it does help my ego lol. H&N 8.64 FTT can be more accurate in some of my guns, but shoot a good deal slower than the 8.44 Exacts even though they are similar weights. Definitely slower than 0.2 grains would suggest. The H&Ns fit tighter so that probably has a lot to do with the slower velocities and better accuracy.
Quote from: NorCalMan on August 09, 2021, 10:37:54 PMQuote from: Bayman on August 09, 2021, 07:27:20 PMNice job Mike. I find the JSBs consistently make more power for their weight than any other brand. They usually have the smallest extreme spreads too. This doesn't always equate to being the most accurate pellet for the gun but it does help my ego lol. H&N 8.64 FTT can be more accurate in some of my guns, but shoot a good deal slower than the 8.44 Exacts even though they are similar weights. Definitely slower than 0.2 grains would suggest. The H&Ns fit tighter so that probably has a lot to do with the slower velocities and better accuracy.I have found that tighter heads in higher power springers get more power. Not less ! Resistance means higher pressuresare developed behind the pellet before it starts moving down the bore.Maybe for you but not for my guns. Then again nothing I have is over 15 fpe. Even out of the same tin the tighter ones go slower through the chronograph.
Did you see anything wrong with the old breech seal before replacement? Thaanks
I find the JSBs consistently make more power for their weight than any other brand. They usually have the smallest extreme spreads too. This doesn't always equate to being the most accurate pellet for the gun but it does help my ego lol. H&N 8.64 FTT can be more accurate in some of my guns, but shoot a good deal slower than the 8.44 Exacts even though they are similar weights.
Quote from: Bayman on August 09, 2021, 07:27:20 PMI find the JSBs consistently make more power for their weight than any other brand. They usually have the smallest extreme spreads too. This doesn't always equate to being the most accurate pellet for the gun but it does help my ego lol. H&N 8.64 FTT can be more accurate in some of my guns, but shoot a good deal slower than the 8.44 Exacts even though they are similar weights.I shoot mostly much lower-powered springers than the D34, but have found the same with JSB's in these guns.The most startling transformation was with Air Arms Falcons (a JSB-made 7.3 gr round head) in my old R7. They are faster than 6.9 gr Hobbys, give PCP-like consistent velocity, and very smooth to shoot. An already sweet little sporter was suddenly a laser-accurate, near-recoilless wonder gun, LOL... The Falcon also makes the P1 pistol a heck of a lot easier to shoot well.IMHO it has to do with the skirt design. JSB uses soft lead, the skirts are tapered inside so that the edge is rather thin, and the diameter runs a little small (.181 or so. RWS is the other extreme; their older designs - Hobby, Superdome, Superpoint, Super H-Point; Meisterkugeln - can run up to .186 or even more). They seem to put up less starting resistance than most others, especially if the breech leade is just a sharp-edged 45-degree chamfer as in many guns these days.
As far as accuracy vs chrono #s, I've had excellent chrono #s from inaccurate pellets (crow magnum for example) and bad #s from inaccurate pellets. But I've never had bad #s from an accurate pellet. As far as JSB and H&N and velocity, I've seen the same thing. JSB 8.44 run about 827 and FTT run in the 780s. Although my ES often ends up high,, because every once in a while it will throw a shot way fast or slow.. like when I was testing the Baracuda FT. Velocities were 745 and very consistent, then it threw one shot at 720, and one at 775. I can occasionally get a good group from JSB, but not consistently (wish I had realized that before I bought a new tin). The FTT always do well for me, assuming I don't screw it up.