257 owners

[Jeremy1982]

put some rounds out to 75 yards today and its spot on with the 257420.1 inch 5 shot group.will try 100 tomm.

[rkr]

put some rounds out to 75 yards today and its spot on with the 257420.1 inch 5 shot group.will try 100 tomm.

Nice, what size do they drop from the mold?

[Loren]

Mine are measuring .2594 - .2601 at the driving bands.  "Pure" lead and running lead and mold hot.  Measured with Mitutoyo mic good to 0.00005"

[Jeremy1982]

Im getting .2587 with a 1 % tin.May try a 3% tin to make them just a touch harder.Shot one into a water jug and it turned the bullet inside out.

[rsterne]

This bullet is as close as I could draw it to the original dimensions of the Lyman 257420, with the following changes:

1. I used a boattail base, starting at the same diameter as the front of the gas check stub, and tapered like the Arsenal version....

2. I changed the lube groove center section to a smooth cylinder, just small enough to miss the lands (ie 0.248"), like my BBTs….

3. The overall length was reduced 0.005" to make it fit one of the mags. mentioned during the development threads, which everyone had lots of opportunity to view and comment in....

https://www.gatewaytoairguns.org/GTA/index.php?topic=150246.

http://noebulletmolds.com/smf/index.php/topic,2676.0.html

4. Most importantly, Al used the new thin RG pins so that all cavities are HP, but there are optional pins to cast a flat nose or cup point.... There are no HP moulds available anywhere else, that I am aware of, without sending the mould out to have them added at extra expense....  Are these bullets identical to the 257420?.... No.... They are a 257420 BT HP design, and hopefully the changes made will increase the BC....

NOTE: Al has also made a shortened version available, with the boattail removed.... (like removing the gas check shank on a 257420)….

http://noebulletmolds.com/NV/index.php?cPath=26_604

This is also made in the RG2 and RG4 moulds, and is 63 gr. as a FN and 60 gr. as a HP....

Bob

[Jeremy1982]

Running 99-1 tin at 1006 fps in a water jug at 40 yards

[rsterne]

Thanks for posting that, Jeremy....

Bob

[Blutroop]

What is the overall length? And Bob what mag are you talking about that it will fit in? Forgive me, I wasn’t paying attention to that thread as I had no 257 at the time.

[Jeremy1982]

No problem Bob.Im really liking this round,seems to be real accurate and better speed then the 420,Im guessing less drag with the bands??

[rsterne]

Denis requested it be just under 0.6" to fit a mag. he had.... I don't know what it was for.... Since that is only 0.005" shorter than the Lyman (and only 0.001" shorter than the Arsenal version)…. I made that change.... The LOA is 0.599"....

Yes, at the same diameter, this bullet should have slightly less bore drag than the 257420.... It eliminates the extra drive band of the Lyman design, and gets rid of the two deep lube grooves.... by instead having the entire midbody just clear the lands.... Getting rid of the deep grooves should provide less disruption to the airflow (less drag) as well.... at least that is the theory, and why I use that on all my designs.... since we don't need those grooves to hold the thick, waxy/greasy lube used in PBs....

Bob

[steveoh]

This is an interesting take on the 420. However, it is not a short range bullet. It will be telling to see 100+ yard results!


Keep us posted.


Knife

I got to shoot my .257 Texan yesterday at 102 yards, and I got the best groups from the hollow point 258-75-FN-BQ6.

[Loren]

Excellent!!! Any idea how fast they were traveling?

[steveoh]

Excellent!!! Any idea how fast they were traveling?

Unfortunately I did not have my chrony with me. I did turn up the power wheel one full revolution from it’s normal Approximate 1/4 power setting. I guesstimate the FPS to be in high 900’s.