Looking for some actually measured velocities for the 257Wby and 264Wmag. If you have any please list barrel lenght, bullet and powder type. I have some for the 264 but very little for the 257.

3300fps with the 264; 125gr Partitions and IMR7828. 3280 with the 130gr AB, same powder. Barrel is 26".

The 87gr bullet goes 3779 fps, 100gr bullet goes
3530fps, The 117gr bullet goes 3323fps, The 120gr bullet goes 3365fps.
Barrel lenght 26" I use RL25 power except the 87gr bullet I use RL22 for it.

Getting 3430fps from 110gr Accubonds in my 257 with 7828.

.257 weatherby,26 inch barrel 100 grain tripple shocks, Ramshot hunter 3550 FPS.
...tj3006

.257 Wby, 25" barrel, RL 22 (forget charge), Norma/Weatherby cases, Fed 215 Mag primer, 100 grs TSX, 3560 fps. This load is fairly hard on the brass - Norma brass is not known to handle pressure all that well.

- mike

For the 257 Wby in a 24 inch barrel I am getting 3500 to 3610 with factory 100 grain TSX and Spire points. Handloaded 100 grain TSX using a non max load I have recored 3450 to 3490 using IMR-7828.

Ken....

My 24" Mark V, 257wby gives 3730 fps with a 85 gr Nosler Ballistic Tip, R-19. Accurate.

.264, 140 Nosler Partition, WC-872 surplus powder, 24.4" barrel, 3150 fps.

264Win, 26" tube and 160 grain Hornady RN with H1000 powder gives +/- 2950 ft/sec.

A 100 gr partition at 3,600 fps+/- from a 257 wby is hard to beat. w/ 200 yd zero and .377 bc, bullet is .8" high at 100 yds. -4.6" @ 300 yds., -13.7 @ 400 yds. It kills hogs and deer DRT.
GWB

26 in. barreled Mk V in .257 WBy. 100 TSX and 72 gr RL22 goes over 3600 fps. Never owned a .264

24 inch barrel Model 70 Winchester.

100 grain Nosler Partition - 3,580 fps - 7828
125 grain Nosler Partition - 3,280 fps - 4350
140 grain Nosler Partition - 3,185 fps - 7828

The 125 grain load is the most accurate.

My Hart barreled 264 does 3800 with 100gr BTs or Partions and +3500 with the 120s and it is super accurate. It will beat a .257 WBY with any and all bullets.

Good to hear rifleshooter. My 264 will be getting a Hart #3 at 26". May have to trouble you for some load information.

David

Had a .257 Vanguard that shot GREAT (under 1/2") with 73 grs. RL-22, 100 TSX, chrono 3580fps, 24". Had the barrel removed and installed on a custom Ruger #3 single shot. Super little rifle!

My WBY ultralight with 26" barrel likes 117gr Sierras with 67gr of R22. Last chrono'd 3410fps.

264 Win Mag
75.3/H-870-140 Sierra Gameking=3120 23" McGowan

same with 129 Hornady SP=3240 fps
Aloha, Mark

257Wby 25" Shilen barrel IMR-7828 with 115gr TSX @3436fps.

I think a 30" 264 would be AMAZING. 140 Bergers at 3300-3400 fps!

30" barrel? So would it be a crew served-weapon or a self propelled weapon?

30" Ruger No1 would be about a 24" bolt gun length.

Gentlemen,
In the above data are you mostly using mag primers or standard primers. I recently purchased a new 700 in .264 and experienced a delayed fire(click bang) w/ standard primers. When I dry fire the weapon every thing seems to be in working order, so I don't believe it is an equipment malfunction. I have a theory that it may be a primer thing.

Thanx,Matt

I've loaded more 264s with 4831 but have also loaded MRP (basically RL22) I have used both std and magnum primers. I ended up using the std because in the rifle I was loading for I got more consistant velocity. I don't know what powder you are using but I have never had an issue of setting of 70grs of powder with a std primer.

I'm sure you are already aware, but in the .264 I own that is being re-barreled right now....:

140gr GameKing @ 3200fps+ with T-870 or US-869
129gr bullets @ 3300fps+ with W-780

Stonecreek later filled me in that the US-869 and the T870 would yield the highest velocity even with the lighter bullets.

mho..........."I forget powder weight" is an unacceptable reply!
Geedubya, "He'd a been a good'un next year!!" Sorry folks!! Just having a little Saturday night fun!! Charlie (GHD)

26 in. .257 with 100 TSX and 72 gr RL22 goes 3650 in my Mk V.

Mark 5 26" barrel Weatherby ammo 117gr RN
3409-3410 for 10 rounds checked.

Never has made sense to me why Weatherby would load a RN bullet in the 257WM. It's a very accurate bullet and has good terminal ballistics, but...

Bohica, I am presently loading for my .264 mag as well with H-870 and was curious if your load of 75.3 gr was correct as my hodgdon # 24 manual lists 73.0 gr max for the 140gr bullet.

quote:

Originally posted by Bohica:
264 Win Mag
75.3/H-870-140 Sierra Gameking=3120 23" McGowan

same with 129 Hornady SP=3240 fps
Aloha, Mark

Dear Huff,
Yes it is correct. This load is safe in MY Remington but I would apprach with care in yours. I also use a 1-10 twist so it reduces pressures a bit more too. I have to use a drop tube with standard 264 brass but not with resized 7mm RM brass. Go figure? The really nice thing about H-870 is it is a ball powder--easy to meter and easier on the bore than the extruded type. It might be hard to find now but I got a couple of 8# cannisters a few years ago so I am set for life.
Aloha, Mark