250-41-FN (Bob’s Boat tail)

This bullet will fit any of the common .25 cal magazines, and should work fine in the twist of any normal airgun barrel…. The chamber may or may not require some work to allow easy chambering….

Bob

Interested in a 2 cavity.

I’m in, with a Lyman style HP pin in one cavity….

Bob

Interested in 2 cacity  brass.

OK count me in for a 5 cavity alum at .250/.252 This should work in my other 25’s
thanks

I measured my Hatsan .25 cal barrel on the AT-44 Long this morning, as best I could without removing it from the gun…. Here is what I found….

Muzzle – pushed a .257 cal bullet in 1/2″ and pulled it back out…. 0.249″ land (or smaller)…. 0.255″ groove….
Breech – I chambered a .250 cal BBT by closing the bolt, and then pushed it back out…. no marks at all…. none…. and no resistance to chambering….
Twist – 17.5″

With these measurements being nearly identical to those for a LW barrel, and Hatsan supplying both…. I suspect they copied LW’s stated dimensions of 0.248″ land and 0.254″ groove with a 17.7″ twist…. Those measurements would be within my measurement tolerances….

If you are ordering either the 41 gr. or 51 gr. BBT from NOE for a Hatsan, I would suggest the 41 gr. in the larger size (0.255″/0.253″)…. If you want to try the 51 gr., you should be aware that since it has a recommended twist of 16″, if you push it too close to Mach 1, you may have a stability problem in the Hatsan barrels…. However, the Stability Factor works out to the recommended SF = 1.5 at 800 fps for the 51 gr in a 17.5″ twist…. so you will likely be fine at any velocity you could likely reach in a Hatsan, even a fully modded BT-65….

Bob

I’m taking a shot in the dark by chiming in on this thread because it appears it’s been at least 9 months since anyone else has posted to it. First of all, hello everyone. I am a NEWB to the world of PCP airguns. I recently purchased an Air Force Condor SS in .25 cal, and I love it. I grew up shooting guns, and of course my first “rifle” was a Daisy 880 pump BB/pellet combo. For a 10 year old kid, that gun was a dream! Well, now I’m 42, and this is the first air rifle I’ve owned since.

I’m a very methodical person. I’m always looking for a way to build a better mousetrap. Although highly impressed with the power and accuracy of my Condor, I know it can get better. After researching pellets for weeks, I discovered the inaccuracies over distance are due in part to the skirt of the pellet creating aerodynamic instability. The fix is a “boat tail” at the back of the pellet- which ironically you discovered WAYYYYYY before I did. So I’m curious, how much better the boat tail pellets perform over standard “skirted” pellets?

I’m curious if anyone has ever tried the boat tail pellets in an Air Force air rifle? The beauty of the Air Force is you can adjust the amount of air released upon squeezing the trigger, Maybe you can do it on other rifles are well. I don’t know. Like I said, I’m a noob to this world. But with as much as I’ve invested already, I’d love to find the best performing product for my set up. So any feedback you guys can give me would be greatly appreciated.

Oh yeah, I also noticed you have boat tail pellet molds in .250 and .253. I’m assuming that 3, thousandths of an inch was to compensate for a small amount of play when the .250 was inserted into a particular make and model of air rifle.

Thanks in advance for your time,
Scott

These are now back in stock in the Store…. Thanks, Al….

http://noebulletmolds.com/NV/index.php?cPath=374_376_467

Bob