270 Weatherby and 170 Grain Berger EOL

leeelmer

leeelmer

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Location
Leslieville Alberta
Hi Guys
Getting a semi custom made up in 270 Weatherby, with a 1-8 gain twist
Looking at running Berger 170gr eol in it,
Anyone have any experience in diffrent powders with these long bullets?
I have had several weatherbys in the past and always run 7828 in them, but this is my first rebarrel, with a custom twist for the heavys,
I think that these 170's should really make the 270bee a long smacker.
 
Do you know if your rifle will be using the Weatherby spec reamer with 1/3" of freebore?

Here's some Quickload predictions based on a 3.4" OAL and approx .050" freebore, much less than the norm

Code: 
Cartridge          :[B] .270 Weath. Mag.[/B]
Bullet             : .277, [B]170, Berger EliteHunt[/B] #27575
Useable Case Capaci: 72.471 grain H2O = 4.705 cm³
[B]Cartridge O.A.L. L6: 3.400 inch [/B]= 86.36 mm
[B]Barrel Length      : 26.0 inch[/B] = 660.4 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 62000 psi, or 427 MPa
or a maximum loading ratio or filling of 104 %
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 !

166 loads produced a Loading Ratio below user-defined minimum of 80%. 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                     99.4     70.0     4.54    3079    97.9    62000   14654   1.257  ! Near Maximum !
Alliant Reloder-33                 101.3     73.4     4.76    3074    98.2    62000   14552   1.255  ! Near Maximum !
Hodgdon Retumbo                    103.2     69.3     4.49    3062   100.0    62000   12788   1.229  ! Near Maximum !
Alliant Reloder-26                  87.3     62.7     4.06    3001   100.0    62000   12196   1.261  ! Near Maximum !
Vihtavuori N560                     90.9     62.0     4.02    3000    99.7    62000   13053   1.249  ! Near Maximum !
Alliant Reloder-25                  96.2     63.9     4.14    2999   100.0    62000   11999   1.247  ! Near Maximum !
Hodgdon H1000                      100.3     66.3     4.29    2998   100.0    62000   12440   1.230  ! Near Maximum !
Accurate MAGPRO                     91.2     64.8     4.20    2994    99.0    62000   13262   1.254  ! Near Maximum !
IMR 7828                            95.2     61.8     4.00    2994    99.9    62000   12633   1.241  ! Near Maximum !
IMR 7828 SSC                        90.1     61.8     4.00    2994    99.9    62000   12633   1.241  ! Near Maximum !
Alliant Reloder-22                  91.1     61.5     3.99    2972   100.0    62000   12412   1.256  ! Near Maximum !
Ramshot Magnum                      91.2     66.3     4.30    2958   100.0    62000   11894   1.252  ! Near Maximum !
Alliant Reloder-19                  89.0     59.4     3.85    2937   100.0    62000   11902   1.257  ! Near Maximum !
Hodgdon H4831                       94.1     61.1     3.96    2923    99.5    62000   11970   1.253  ! Near Maximum !
Hodgdon H4831 SC                    90.5     61.1     3.96    2923    99.5    62000   11970   1.253  ! Near Maximum !
Alliant Reloder-23                  92.7     60.6     3.92    2919   100.0    62000   11041   1.269  ! Near Maximum !
 
leeelmer said:
Hi todbartell, yes will be the long weatherby spec reamer,
I will double check with the smith to be 100% sure, but I believe that is what we agreed on.
Click to expand...

Then you should be able to increase from the charge weights posted above. A friend has a 270 Wby and I did load development for him with the 150gr Nosler Accubond. Rifle is a T3 tikka so the magazine limits to 3.34" OAL, which puts the bullet about .300" off the lands! Alliant data max load was only getting us 2700 fps with RL22, ended up increasing powder charge by a lot and it's pushing them out now at 3150 fps and no high pressure signs
 
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