Texan Bullet Survey Results & Proposed Designs

[Kinetic45^]

Bob, some bullets are just {hate to say it!} too sexy and that .257 is one.  I don't currently have a .257 because I think it's too small a calibur.... And .308 is too big.... So when I get my perfect calibur rifle, the 7mm/.284 you have to design the bullet like that for me.  I was going to get a .308 Texan and rebarrel it but since I've got a Slayer coming I'm going to ask Tom if he would make me a spare barrel in 7mm.  Then I'll need a mold! Basically the same criteria you used to do the others.

[rsterne]

Carl, to keep the same SD, which governs the velocity at a given pressure, a 7mm/.284 would end up between the .257 and .308 bullets, and weigh just over 100 gr.... If I scale the 83 gr. FN .257 up to .284, it ends up at 112 gr., nearly what the .308 bullet weighs, and the SD increases from 0.180 to 0.198.... That would require a 10% or more increase in pressure to get the same velocity....

I designed a .284 BBT, and the mould was made by Veral Smith at LBT.... It works out at 96.5 gr. in FN (SD = 0.170) and 91.0 gr. in HP.... There is also a 7mm mould designed for airguns available from Arsenal, the .284 "Bowman" which is a scaled up Lyman 257420, and weighs 96 gr.... However, if you have your heart set on a 112 gr. version of the .257 above in .284 cal I can certainly draw it up for you.... You already know the deal on custom moulds from NOE.... they charge $300 for the tooling up front....

Bob

[KnifeMaker]

Although I am not really interested in the other Cal's here, the .257 seems to start at what is considered the all time greatest .257 bullet. The Lyman 257420, which is 74 gr's in solid, and .70 gr's in HP version when cast with 20-1 Lead/Tin.


Nice!


Knife

[Kinetic45^]

..... You already know the deal on custom moulds from NOE.... they charge $300 for the tooling up front....

Bob

Yah, I'm going to give Al a call this week and arrange to pay him the cherry fee on another .357 mold.
If I have Accurate make the mold and hollowpointservices do the HP work I've already got $250 invested for a one off mold.  By getting the cherry made I can get multiple copies (if I damaged it or wear or something) or other people can buy/try it too if he lists it.

I'll check out those other 7mm molds, thanks for the tip... But it will be at least June before that project kicks off so there's time.

[Kinetic45^]

Although I am not really interested in the other Cal's here, the .257 seems to start at what is considered the all time greatest .257 bullet. The Lyman 257420, which is 74 gr's in solid, and .70 gr's in HP version when cast with 20-1 Lead/Tin.


Nice!


Knife

Question Knife, I notice you quote 1:20 tin/lead, did you experiment with different alloys? How did you decide on that ratio?  Was it just accuracy or were you also looking for any expansion?

[rsterne]

I received the final designs for the 4 calibers of Texan bullets from Al today and reviewed them.... Al apologizes for the delay and said they would be added to the lineup for the mill when they ramp up production again in a couple of weeks....

Bob