257 Wby and 75 gr Sierra

[wayno945]

Hi everyone, I just started reloading and was looking to get a little info. I'm trying to cook up an accurate coyote load for my 257 Bee. I'll be using 75 gr Sierra varminters and RL22 or 7828. Any suggestions would be appreciated. Also, I've seen COAL listed between 3.075 and 3.25 inches for this load. Would it be best to start at 3.075?

Thanks,

Wayne

 

[JD338]

Wayne

Welcome to the forum!

The fellas who load for the 257 Wby will be along shortly.
Stay tuned.

JD338

 

[hardpan]

Hi there and welcome...
My first inclination would be to talk you out of that bullet. You can push a 100 gr BT at 3400 fps+++, and that bullet is a great fit. I push the 110 AB with IMR 7828 (69.0) grs in 3 different 257 wbys, with great accuracy and around 3400 fps. Use 66.5 gr of 4851 and a 100 GR BT at 3500 FPS++ and again great (1/2 inch 3 shot group accuracy)

Having said that, here are some ideas;
1) WBYs have a lot of freebore, I measure the magazine and load as long as the cartridge will fit. I still get over an eighth of freebore... This is one of the more important things to check. SAMMI COAL is 3.25 max. I load 3.392 for my coal and it works very well. In fact, changing the COAL was what made this gun shoot the best.. IE the largest difference.
2) WBYs tend to like hot loads. Hence, a slower powder like 7828 often outperforms faster powders like 4350. None of my 257s shoot 4350 well, but it is listed as the most accurate powder for the 110 gr AB...
3) I use federal mag primers.
4) the 257 is tricky to load for. make sure that the scope is tight, use a chrono to help narrow the choices down.
5) Stock WBYs have a screw on the forearm/fore stock that needs to be tightened to 35 inch pounds. Check this out on the WBY site, but their guns do not have floated barrels.

Don't get discouraged... The 257 WBY is a great gun, just a little fickle for those of us that demand 1/2 inch groups.
hardpan

 

[wildgene]

Hi everyone, I just started reloading and was looking to get a little info. I'm trying to cook up an accurate coyote load for my 257 Bee. I'll be using 75 gr Sierra varminters and RL22 or 7828. Any suggestions would be appreciated. Also, I've seen COAL listed between 3.075 and 3.25 inches for this load. Would it be best to start at 3.075?

Thanks,

Wayne

...Sierra lists COAL for the 75gr. HP @ 3.025, relatively long bearing surface/ short ogive. I've had pretty good luck w/ both the 75gr. Sierra & V-Max, but for long range coyote I would go w/ the 85gr. NBT (BC 0.329) or new 90gr. Sierra BlitzKing (BC 0.393). The 75gr. bullets start to lose momentum quickly after 400yds., the 85/90gr. don't drop as fast, & buck the wind better. As far as COAL, I like to leave the end of the bearing surface @ the bottom of the case neck if possible, instead of trying to "stretch" it out to reach the lands...

 

[wayno945]

Thanks for the feedback. Hardpan, my rifle is a 700 CDL, do you know if Remington chambers that with as much freebore as Weatherby? I picked up the sierras on clearance, was considering trying the 85 BTs next go round. I had the rifle "accurized" by HCR in Texas, I know it shoots subMOA with factory rounds.

 

[FOTIS]

Welcome and here you go!


Cartridge : .257 Weath. Mag
Bullet : .257, 75, Sierra HP 1600
Useable Case Capaci: 82.687 grain H2O = 5.369 cm³
Cartridge O.A.L. L6: 3.200 inch = 81.28 mm
Barrel Length : 26.0 inch = 660.4 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 64000 psi, or 441 MPa
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

165 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Vihtavuori N570 108.5 87.2 5.65 4073 94.7 64000 15905 1.025 ! Near Maximum !
Hodgdon Retumbo 112.4 86.1 5.58 4062 100.0 64000 14553 1.016 ! Near Maximum !
ADI AR 2218 111.8 90.8 5.88 4061 94.6 64000 16031 1.009 ! Near Maximum !
Alliant Reloder-25 105.9 80.3 5.20 4040 100.0 64000 13962 1.017 ! Near Maximum !
Norma MRP 98.2 78.1 5.06 4040 99.7 64000 14531 1.024 ! Near Maximum !
Vihtavuori N560 100.0 77.9 5.05 4039 97.6 64000 14840 1.017 ! Near Maximum !
Hodgdon H870 114.8 90.4 5.85 4038 96.7 64000 15360 1.030 ! Near Maximum !
IMR 7828 SSC 98.9 77.4 5.02 4037 98.1 64000 14467 1.005 ! Near Maximum !
IMR 7828 104.6 77.4 5.02 4037 98.1 64000 14467 1.005 ! Near Maximum !
Norma MRP 2 107.9 82.3 5.33 4025 98.6 64000 14760 1.031 ! Near Maximum !
Ramshot Magnum (Big Boy) 102.1 83.3 5.40 4025 98.6 64000 14493 1.017 ! Near Maximum !
PB Clermont PCL 517 102.5 83.4 5.40 4024 98.6 64000 14479 1.017 ! Near Maximum !
SNPE Vectan SP 12 102.3 83.3 5.40 4023 98.7 64000 14460 1.017 ! Near Maximum !
ADI AR 2213 100.0 77.1 4.99 4022 98.0 64000 14312 1.002 ! Near Maximum !
Alliant Reloder-50 114.7 94.5 6.12 4017 94.6 64000 15750 1.054 ! Near Maximum !
Bofors RP5/NP ~approximation 100.3 77.3 5.01 4012 99.0 64000 14324 1.021 ! Near Maximum !
Alliant Reloder-22 100.3 77.3 5.01 4012 99.0 64000 14324 1.021 ! Near Maximum !
Raufoss RA15 100.3 77.3 5.01 4012 99.0 64000 14324 1.021 ! Near Maximum !
Accurate MAGPRO 100.1 81.1 5.25 4012 96.4 64000 14800 1.027 ! Near Maximum !
Winchester WXR 103.0 77.7 5.03 4009 98.9 64000 14323 1.022 ! Near Maximum !
ADI AP 2214 103.6 82.0 5.31 4002 98.5 64000 14040 1.005 ! Near Maximum !
Hodgdon H1000 108.9 82.1 5.32 3999 98.4 64000 13996 1.005 ! Near Maximum !
ADI AR 2209 97.2 73.7 4.77 3988 98.8 64000 13732 1.003 ! Near Maximum !
Rottweil R905 101.7 76.9 4.98 3979 97.6 64000 14007 1.018 ! Near Maximum !
Alliant Reloder-19 97.6 74.4 4.82 3979 98.9 64000 13764 1.011 ! Near Maximum !
Ramshot Hunter 93.3 73.4 4.76 3973 99.9 64000 13395 1.016 ! Near Maximum !
Bofors RP14 ~approximation 98.3 74.9 4.86 3969 98.9 64000 13652 1.012 ! Near Maximum !
Bofors RP5 NT ~approximation 103.5 80.4 5.21 3966 96.2 64000 13963 1.006 ! Near Maximum !
Norma URP 93.0 70.1 4.55 3962 100.0 64000 12965 1.018 ! Near Maximum !
Bofors RP19 ~approximation 93.1 70.2 4.55 3962 100.0 64000 12961 1.018 ! Near Maximum !
Raufoss RA4 95.8 73.0 4.73 3960 98.7 64000 13482 1.008 ! Near Maximum !
Bofors RP4 ~approximation 95.8 73.0 4.73 3960 98.7 64000 13482 1.008 ! Near Maximum !
Norma 204 92.8 73.0 4.73 3960 98.7 64000 13482 1.008 ! Near Maximum !
Vihtavuori N550 90.4 70.4 4.56 3960 100.0 64000 13077 1.021 ! Near Maximum !
Somchem S365 94.6 71.7 4.65 3957 100.0 64000 12544 1.028 ! Near Maximum !
Accurate 4350 96.3 70.2 4.55 3953 100.0 64000 12961 1.035 ! Near Maximum !
Hodgdon H4831 SC 98.8 76.1 4.93 3945 97.4 64000 13524 1.009 ! Near Maximum !
Hodgdon H4831 102.8 76.1 4.93 3945 97.4 64000 13524 1.009 ! Near Maximum !
IMR 4831 97.5 71.2 4.61 3934 100.0 64000 12674 1.027 ! Near Maximum !
Accurate 8700 120.8 94.3 6.11 3933 94.2 64000 14113 1.023 ! Near Maximum !
Bofors RP4 NT ~approximation 93.6 72.4 4.69 3932 99.6 64000 13044 1.018 ! Near Maximum !
Rottweil R904 96.8 72.7 4.71 3930 98.0 64000 13187 1.006 ! Near Maximum !
Somchem S385 97.7 75.3 4.88 3928 99.4 64000 13178 1.030 ! Near Maximum !
Lovex S070 93.0 70.1 4.54 3924 99.7 64000 12912 1.021 ! Near Maximum !
Hodgdon H4350 95.6 71.3 4.62 3924 99.4 64000 12858 1.007 ! Near Maximum !
IMR 4350 93.9 71.2 4.61 3923 99.4 64000 12839 1.007 ! Near Maximum !
Vihtavuori 20N29 118.6 97.3 6.30 3918 91.7 64000 14302 1.037 ! Near Maximum !
SNPE Vectan SP 13 118.5 92.3 5.98 3918 93.9 64000 14068 1.036 ! Near Maximum !
Vihtavuori 24N41 110.5 89.7 5.81 3918 88.5 64000 14084 1.017 ! Near Maximum !
Rottweil R907 91.2 68.3 4.42 3915 99.4 64000 12783 1.010 ! Near Maximum !
PB Clermont PCL 513/520/9520 120.2 93.6 6.07 3912 92.7 64000 14070 1.035 ! Near Maximum !
Hodgdon Hybrid 100V 98.8 70.4 4.56 3911 100.0 64000 12013 1.018 ! Near Maximum !
Winchester Supreme 780 96.2 77.3 5.01 3910 98.9 64000 13012 1.018 ! Near Maximum !
Hodgdon 50BMG 116.3 90.0 5.83 3909 84.4 64000 14229 1.024 ! Near Maximum !
Lovex S065 92.1 68.7 4.45 3904 100.0 64000 12488 1.017 ! Near Maximum !
Vihtavuori N165 102.7 77.5 5.02 3903 99.3 64000 12825 1.023 ! Near Maximum !
Bofors RP3 NT ~approximation 90.1 68.2 4.42 3902 100.0 64000 12283 1.001 ! Near Maximum !
Accurate 3100 106.3 76.6 4.96 3901 99.9 64000 12792 1.047 ! Near Maximum !
Vihtavuori N160 103.1 75.4 4.88 3897 98.0 64000 12876 1.012 ! Near Maximum !
Hodgdon US 869 115.9 94.1 6.10 3896 88.8 64000 14035 1.030 ! Near Maximum !
Vihtavuori N170 111.7 84.2 5.46 3887 93.1 64000 13596 1.036 ! Near Maximum !
Somchem S361 95.5 77.6 5.03 3869 97.4 64000 12771 1.021 ! Near Maximum !
Vihtavuori N150 93.7 67.4 4.37 3846 100.0 64000 11382 1.020 ! Near Maximum !
Lovex D100 108.0 88.6 5.74 3836 89.4 64000 13104 1.030 ! Near Maximum !
TLP A 502(RH) ,test only 126.7 94.5 6.12 3829 78.4 64000 13404 1.019 ! Near Maximum !
Vihtavuori N135 90.2 62.3 4.04 3812 100.0 64000 10736 1.022 ! Near Maximum !
NC A3502 ,test only 125.2 93.3 6.05 3794 74.3 64000 13216 1.016 ! Near Maximum !
V1734 7-multiperf ,test only 143.0 106.6 6.91 3341 48.5 64000 9197 1.056 ! Near Maximum !
IMR TrailBoss 149.0 38.3 2.48 3049 100.0 64000 5714 1.000 ! Near Maximum !
ADI AS 25 BP 149.0 38.3 2.48 3049 100.0 64000 5714 1.000 ! Near Maximum !
Vihtavuori N32C Tin Star 99.5 37.8 2.45 3033 100.0 64000 5630 1.001 ! Near Maximum !

 

[hardpan]

Thanks for the feedback. Hardpan, my rifle is a 700 CDL, do you know if Remington chambers that with as much freebore as Weatherby? I picked up the sierras on clearance, was considering trying the 85 BTs next go round. I had the rifle "accurized" by HCR in Texas, I know it shoots subMOA with factory rounds.

Hi Wayne,
Don't know about the 700 cdl and freebore, But, if you already have sub MOA, Chrono the load, and then you can try to get to a similar velocity with power selection. I generally use the 257 on deer, so 100 gr BTs work great.
best,
hardpan

 

[300WSM]

Thanks for the feedback. Hardpan, my rifle is a 700 CDL, do you know if Remington chambers that with as much freebore as Weatherby? I picked up the sierras on clearance, was considering trying the 85 BTs next go round. I had the rifle "accurized" by HCR in Texas, I know it shoots subMOA with factory rounds.

Hello Wayne....

Welcome to the forum

Winchester and Remington rifles chambered in Weatherby calibers are NOT free bored like WBY rifles

The 75 grain/4000 fps sure is awesome. The downside to that specific bullet is conditions have to be almost better than perfect. The wind drift with that little bullet is significant. Then again the wind is no friend of any long shot/caliber bullet combo this side of a 50 BMG

 

[nitis]

Keeep your overall short and you will be much better off at least thats how my remmy works

As for bullet choice I say load up some 100 gr ballistic tips when you actually look at trajectories you will be surprised just because you are getting 4k the 100 at 3600 is pretty tough to beat

I even scrapped the idea of 2 loads for mine and just shoot accubonds for both

Unless you are saving the pelts which I doubt you are who cares

 

[efw]

I've worked up a load using moly'd 87 gr TNTs & IMR-4350 that I use for fireforming 7 RM brass, but I'm with the others... if I were you, I'd go w/ 100 gr NBTs.

Like others, I found that my Vangard likes bullets seated deep... the previous owner couldn't seem to get the 110 ABs to shoot, so I tried 'em seated as deeply as I would 100 gr monometals (100 gr ETips produced geniune 1-hole groups w/ RL22) and VIOLA! Groups tightened up using FC 7RM brass & IMR-7828.

My opinion is going to be affected heavily by the fact that I have a 257 AI that I varmint hunt with, but I consider my 257 Roy to be a big game rifle, and save the varmint blasting for more mild, econimical, cartridges.

On the other hand, I am rather curious as to what my first 'yote will look like when/if I nail one w/ that 87 gr TNT load !

 

[wayno945]

Thanks for the replies guys.. appreciate the input!