Getting a tad over 3500FPS with the 110 Accubonds from a 26" mark V I feel like it is the perfect compromise. Still a lot of speed to beat the wind and an absolute masher on impact to 500 yards. It's an oxymoron, but it's...practical in the 257Bee.
My budget .257 WBTY build ...
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I took some measurements with the 145s; as seen below, CBTO touching the lands is 2.848" (average of 5) and COAL of 3.441"; I plan on starting at .020" off the lands as the baseline. I have plenty of magazine clearance.
Outlaw6.0
Well-Known Member
I managed to load some rounds and made it to the range earlier this week. However, I ran into some issues with my Lab Radar (operator error). I load up the following just to establish a baseline using powders (starting with MAGPRO) I already have open.
At 100Y 2 series shot, .011" off the lands.
- 64 = .413" - I forgot to arm it (operator error).
- 64.5 = .553", 2954, 2956 - this is the only one I managed to have a velocity reading. However, I cannot arm the LR because of the low battery (internal, not the pack - another operator).
But the show must go on ...- 65 = 1.705"
- 65.5 = 1.46"
- 66 = .413"
- 66.5 = 1.502"
- 67 = .414"
At 200Y, 015" off the lands.
- 67.5 = 1.079" - has potential; no pressure signs thus far.
I did not know when I would be able to have another range time opportunity. Until then, @Petey308 was nice enough to run some QL numbers for me. Thanks, Brother Aaron.
*Start load- 60.9gr at 47,898psi and 2780fps
*Max load- 66.9gr at 63,529psi and 3071fps
"Calibrated" Estimated Nodes:
*Node 7- 61.7gr at 49,744psi and 2819fps
*Node 6.5- 63.9gr at 55,178psi and 2926fps
*Node 6- 65.6gr at 59,768psi and 3008fps
Not too shabby for a baseline.
My pleasure! I'm intrigued by those bullets, and I have a soft spot for quarter-bores, so I'll be really interested to see how this goes for you!View attachment 402021
I managed to load some rounds and made it to the range earlier this week. However, I ran into some issues with my Lab Radar (operator error). I load up the following just to establish a baseline using powders (starting with MAGPRO) I already have open.
At 100Y 2 series shot, .011" off the lands.
- 64 = .413" - I forgot to arm it (operator error).
- 64.5 = .553", 2954, 2956 - this is the only one I managed to have a velocity reading. However, I cannot arm the LR because of the low battery (internal, not the pack - another operator).
- 65 = 1.705"
- 65.5 = 1.46"
- 66 = .413"
- 66.5 = 1.502"
- 67 = .414"
At 200Y, 015" off the lands.
- 67.5 = 1.079" - has potential; no pressure signs thus far.
View attachment 402031
I did not know when I would be able to have another range time opportunity. Until then, @Petey308 was nice enough to run some QL numbers for me. Thanks, Brother Aaron.
*Start load- 60.9gr at 47,898psi and 2780fps
*Max load- 66.9gr at 63,529psi and 3071fps
"Calibrated" Estimated Nodes:
*Node 7- 61.7gr at 49,744psi and 2819fps
*Node 6.5- 63.9gr at 55,178psi and 2926fps
*Node 6- 65.6gr at 59,768psi and 3008fps
Not too shabby for a baseline.
Bghunter338
Well-Known Member
Your welcome brother
had both .257wthby and 06.....kept 06 because I had a boat load of brass....sold wthby.....06 does all I need long range Coyotes, deer, antelope...Savage LA, McGowen SS (cerakoted) 1:7" 22" 5R Remington standard contour, MBM 4-port beast, Oryx chassis. I just screwed it together (not head-spaced) for a teaser picture.
View attachment 289679
View attachment 289680
View attachment 289681
This is my first .25 caliber. I considered the .25-06 AI and the .25 Gibbs before deciding on the .257 WBTY. I am not a fan of proprietary cartridges but I figure I give it a try.
View attachment 289682
(Factory 100 SP vs 117 Cayuga).
More to follow ...
Ed
HRM Johnny
Well-Known Member
How many grains of R33 were you at? I tried my .257 WBY today with the 135's, and hit pressure at 65.5gr H1000. At 65 grains H1000 was at about 3160FPS, was hoping for a tad more speed out of a 27" barrel. I just loaded some up with RL25 going to give that a try. Might try some 33 if I need to!
Started at 75 grs and worked up to 81 grs. Never seen pressure even at 81. I also tried H-1000 with the 120 Speer GS. Worked up to 75 grs for a velocity of 3369 ft/sec, but I found this load a little on the hot side. Retumbo and RL-26 also got me good velocity and accuracy.
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jduramaxeichinger
Well-Known Member
Mine loves 72gr of RL22 with 100gr TSX. It groups in one hole at a little over 3600 fps at 3.302 OAL.
I found this to be a standard load for the weatherby, with a slow lot of powder taking 73g. Now chop off the freebore, you get 3850/
Pac Nor has a very short freebore reamer, and their three groove shot is smaller than clover leaf groups within 12 shots fired at 3850, 10T, 26".
These are the powder charges that I was expecting. I was surprised when I hit pressure at 65.5 gr H1000 with the 135gr. I was about .15ish off the lands. I seated them in another .05 to see if it makes any difference. It's not going to make 5+ grains difference though.
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