.224 cal 40 gr. BBT HP
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Boolit and Pellet Casting
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.224 cal 40 gr. BBT HP
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Topic: .224 cal 40 gr. BBT HP (Read 296 times))
rsterne
Member 2000+fps Club
Bob and Lloyd
GTA Senior Contributor
Posts: 26960
GTA Forums Person of the Year 2017
Real Name: Bob
.224 cal 40 gr. BBT HP
«
on:
November 09, 2019, 05:57:12 PM »
I have drawn up a scaled down version of the .257-65 BBT and posted the drawing in a thread at NOE.... Here is the drawing.... Note that the twist rates on the drawings are from the Kolbe Twist Calculator, and are convervative for my Bob's Boattails, they always seem to work in a slower twist....
Based on the success of the .257 version, this should work great in a 14" twist TJ's barrel.... and it shouldn't be too much of a trick to drive it at 950 fps in a powerful PCP.... I would have Al make the tooling slightly undersize, so that NOE could also make a .217 cal version, with the boattail shortened (which increases the stability) to work in Hatsan or Marauder mags.... that would be 35 gr. as a HP....
The question is, would it work in the twist rate of any of the .22 cal airgun barrels around.... I would hope it would work in a 16" twist....
If you are interested in either version, please post at the NOE Forum in the following thread....
http://noebulletmolds.com/smf/index.php/topic,1127.0.html
Bob
Logged
Coalmont, BC, Canada
🇺🇦
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦
Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).
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All Springer/NP/PCP Air Gun Discussion General
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Boolit and Pellet Casting
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.224 cal 40 gr. BBT HP