I've recently acquired a Blaser R93 in 7mm rem mag and have been trying to develop some loads using 160gr Accubonds.

This is the first time of owned a Blaser and a 7mm.

The best results to date have been with 64 grains of Australian ADI 2217 powder. While the accuracy is what I want - essentially one ragged hole - the speed is not what the calibre can achieve, however I'm yet to run the load through a chronograph.

I'd appreciate any advice on alternative loads using these Accubonds.

Thanks in advance.

Jim

I"m not sure what powders you have over there, but I have worked up to 71.5g Retumbo (3115fps), and 66.5g RL22 (3055fps) in my 7mags very safely and accurately. Bullets were .010 off lands.

I've had good results with IMR4831. 66.0 grains, 3050 over the chronograph. This was with 160 TSX's, 25.5" barrel.

quote:

the speed is not what the calibre can achieve, however I'm yet to run the load through a chronograph.

Not sure what you base this statement on if the load hasn't been chronographed? Perhaps on the specifications of the powder manufacturer?

Thank you gentlemen for the advice so far.
Stonecreek, in terms of velocity, indeed I'm guessing at the moment given the load hasn't been chronographed. The current load has been shot out to 500 yards, and based on its drop, compared to a friend's 7mm loads, with known velocity, my load is somewhat milder.
But I agree, the conograph is needed to remove doubt.

???? Did I miss something???

Cartridge          : 7 mm Rem. Mag.(SAAMI)
Bullet             : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 72.286 grain H2O = 4.693 cm³
Cartridge O.A.L. L6: 3.290 inch = 83.57 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : ADI AR 2217

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-20.0   78    51.20   2091    1554   22167   8664     80.5    1.844
-18.0   80    52.48   2148    1639   23597   9035     82.3    1.798
-16.0   82    53.76   2205    1727   25124   9404     84.0    1.753
-14.0   84    55.04   2263    1819   26752   9767     85.7    1.709
-12.0   85    56.32   2321    1914   28491  10124     87.3    1.667
-10.0   87    57.60   2381    2013   30350  10472     88.9    1.624
-08.0   89    58.88   2440    2116   32333  10810     90.3    1.583
-06.0   91    60.16   2501    2222   34461  11136     91.7    1.534
-04.0   93    61.44   2561    2331   36736  11448     93.0    1.487
-02.0   95    62.72   2622    2443   39173  11744     94.2    1.441
+00.0   97    64.00   2684    2559   41788  12023     95.3    1.397
+02.0   99    65.28   2745    2678   44595  12282     96.3    1.354
+04.0  101    66.56   2807    2799   47612  12521     97.2    1.313
+06.0  103    67.84   2869    2924   50858  12736     97.9    1.273
+08.0  105    69.12   2930    3051   54355  12928     98.6    1.234  ! Near Maximum !
+10.0  107    70.40   2992    3181   58129  13094     99.1    1.196  ! Near Maximum !

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     97    64.00   2857    2901   50761  12146     99.7    1.280
Data for burning rate decreased by 10% relative to nominal value:
-Ba     97    64.00   2464    2156   34017  11061     85.5    1.544
    

Take a peek at Hodgdon's website. They have load data for a 160gr Nosler Partition; very similar to your Accubond.

7 Rems have more velocity variation from barrel to barrel than any other caliber I've worked with much. Sometimes you can get the speed back on the slow barrels by pouring the coal to it, and sometimes you can't. 2217 is what we call H1000 on this side of the pond. You may be able to turn the heat up on your loads, 64 grains of H1000 isn't much of a barn burner. I haven't found H1000 to be the fastest powder in the 7 Rem or STW but it is usually a fast track to accuracy. I find myself using a lot of IMR 7828 now, but am unsure of the Australian availability.