Hello BOB if I offended you and the GTA staff accept my apologies. You and a few others here insets a boat tail will out preform a flat base bullet.I give you real world groups. ALL 30 CALBER air gun.Number 1 132 gr flat base Have never found a bullet that will out shoot it to 500 ydsNumber 2 152 gr spire point gas check {closest you can get to your rebated boat tail in the drawing real life example} shoots very well and has been used in air gun competition with a lot of wines attributed to it bucks the wind ok good to 600 yards because of it weight and nose shape Number 3 156 gr flat point with gas check mainly used for hunting and does the job very well have used to 300 ydsNow all three are average best groups for the bullets in the photos.The rebated boat tail {gas check} just can not do what the 132 flat base will do in three real air guns Qb,haley,and new big bore from air hog .I know some of you do not believe a flat base will out preform a boat tail but ask why is there no boat tail hand gun bullets especiallymatch ammo it is all flat base a boat tail just will not give a 20 percent increase{ as indicated in this posting} in the real world of air guns it is just the reverse . Photos show thisPlease look at the proof and if you have better grouping with a boat tail of any type lets see it ,no more number crunching and graphs just real world proof.David
Quote from: jr460 on July 06, 2015, 09:18:42 PMHello BOB if I offended you and the GTA staff accept my apologies. You and a few others here insets a boat tail will out preform a flat base bullet.I give you real world groups. ALL 30 CALBER air gun.Number 1 132 gr flat base Have never found a bullet that will out shoot it to 500 ydsNumber 2 152 gr spire point gas check {closest you can get to your rebated boat tail in the drawing real life example} shoots very well and has been used in air gun competition with a lot of wines attributed to it bucks the wind ok good to 600 yards because of it weight and nose shape Number 3 156 gr flat point with gas check mainly used for hunting and does the job very well have used to 300 ydsNow all three are average best groups for the bullets in the photos.The rebated boat tail {gas check} just can not do what the 132 flat base will do in three real air guns Qb,haley,and new big bore from air hog .I know some of you do not believe a flat base will out preform a boat tail but ask why is there no boat tail hand gun bullets especiallymatch ammo it is all flat base a boat tail just will not give a 20 percent increase{ as indicated in this posting} in the real world of air guns it is just the reverse . Photos show thisPlease look at the proof and if you have better grouping with a boat tail of any type lets see it ,no more number crunching and graphs just real world proof.DavidWeeeeeellllll, to me, you shot 2-150+ gr GC bullets vs a 132 gr FP bullet. You will have to shoot the 132gr (which shows accurate in your gun) in both FB and GC configuration to prove that theory a little more solidly. This simply tells me your particular barrel doesn't really like bullets that heavy more than it does your gun NOT liking GC slugs or GC NOT being more accurate.................My Corsair 308 with the 1-20 twist didn't like 150+ gr slugs but it loved the 130s and lighter too. As a matter of fact, i had the same FB 130 mold that you show up above and i had the RCBS 150 gr converted to HP and it was Gas Check. GUESS WHICH ONE IT LIKED MORE...........................NOT THE 130 gr FB bullet............................Now for me, i've shot accurate BOTH. But none of them where the same bullets and that's the problem.NOE HAS MOLDS for the SAME BULLETS IN BOTH CONFIGURATIONS (GC and FB). And in the same mold to................
Quote from: Tofazfou on July 06, 2015, 10:02:35 PMQuote from: jr460 on July 06, 2015, 09:18:42 PMHello BOB if I offended you and the GTA staff accept my apologies. You and a few others here insets a boat tail will out preform a flat base bullet.I give you real world groups. ALL 30 CALBER air gun.Number 1 132 gr flat base Have never found a bullet that will out shoot it to 500 ydsNumber 2 152 gr spire point gas check {closest you can get to your rebated boat tail in the drawing real life example} shoots very well and has been used in air gun competition with a lot of wines attributed to it bucks the wind ok good to 600 yards because of it weight and nose shape Number 3 156 gr flat point with gas check mainly used for hunting and does the job very well have used to 300 ydsNow all three are average best groups for the bullets in the photos.The rebated boat tail {gas check} just can not do what the 132 flat base will do in three real air guns Qb,haley,and new big bore from air hog .I know some of you do not believe a flat base will out preform a boat tail but ask why is there no boat tail hand gun bullets especiallymatch ammo it is all flat base a boat tail just will not give a 20 percent increase{ as indicated in this posting} in the real world of air guns it is just the reverse . Photos show thisPlease look at the proof and if you have better grouping with a boat tail of any type lets see it ,no more number crunching and graphs just real world proof.DavidWeeeeeellllll, to me, you shot 2-150+ gr GC bullets vs a 132 gr FP bullet. You will have to shoot the 132gr (which shows accurate in your gun) in both FB and GC configuration to prove that theory a little more solidly. This simply tells me your particular barrel doesn't really like bullets that heavy more than it does your gun NOT liking GC slugs or GC NOT being more accurate.................My Corsair 308 with the 1-20 twist didn't like 150+ gr slugs but it loved the 130s and lighter too. As a matter of fact, i had the same FB 130 mold that you show up above and i had the RCBS 150 gr converted to HP and it was Gas Check. GUESS WHICH ONE IT LIKED MORE...........................NOT THE 130 gr FB bullet............................Now for me, i've shot accurate BOTH. But none of them where the same bullets and that's the problem.NOE HAS MOLDS for the SAME BULLETS IN BOTH CONFIGURATIONS (GC and FB). And in the same mold to................Please reread my post with photos These are average grouping out of 3 different air guns made by 3 different makers.David
I know some of you do not believe a flat base will out preform a boat tail but ask why is there no boat tail hand gun bullets especiallymatch ammo it is all flat baseDavid
LOL, this threads Gimme an Headhake
Ok Bob BOTAIL just do not work that well below the speed of sound and going from the speed of sound and drooping below it in flightdoes a lot of strange things to projectiles( which you have left out of your data),Why has the Olympics shooters not cum up with this idea in the 22's they compete with and the air gun pellets they use.In the Olympics a 20 percent advantage would not be over looked no matter the cost.As I have said keep up your good work but please complete the math.
Just and interesting anecdote..."If the base of the bullet were made more streamlined, then the air would be put back together more smoothly, with less turbulence, and would fill the space left by the passing bullet more quickly. This would eliminate much of the base drag. Putting a point on both ends of the bullet accomplishes this, but it generally makes the bullet too long...There is no technical reason why a double-ended bullet should not be used to overcome drag..." Dave CorbinAnd by the way, I hate the way a certain person is baiting Mr. Stern. Isn't it called "trolling" for controversy to continually criticize someone while offering nothing positive in return?Chuckster
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