Powder choice

[Scotch_egg]

I am looking for advice regarding powder choice for a 7X64 Brenekke. This is a hunting rifle that will not see strings of fire so I am leaning in the direction of the high performance powders such as RL17.

 

My concern lies with temperature tolerance. I intend to shoot a 160gr bullet from a 575mm length barrel. So I'm already at a disadvantage and wish to achieve the best performance possible to help beat the wind.

[BlueBoy69]

I think you'll find RL17 (Elcho 17) and RS60 a bit too quick.

 

Here's an output from QuickLOAD covering powders of a suitable burning rate and high loading density. Rated from highest to lowest velocity at the normal working pressure (52,666 psi, or 363 MPa).

 

Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muz B_Time
% Grains Gram fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Norma MRP 98.3 58.5 3.79 2819 98.8 52667 12992 1.209
ReloadSwiss RS 70 95.0 57.7 3.74 2806 99.2 52667 12614 1.197
Vihtavuori N560 99.8 58.2 3.77 2802 95.8 52667 13056 1.206
IMR 7828 SSC 98.5 57.7 3.74 2789 96.2 52667 12675 1.197
Alliant Reloder-22 100.0 57.7 3.74 2785 97.6 52630 12661 1.212
Alliant Reloder-19 96.4 55.0 3.56 2740 97.5 52667 11977 1.211
Hodgdon H4831 SC 97.9 56.5 3.66 2717 95.4 52667 11749 1.208
IMR 4831 96.0 52.5 3.40 2708 100.0 52667 11066 1.235
Winchester WXR 100.0 56.5 3.66 2706 96.5 48277 12348 1.262
Alliant Reloder-23 100.0 55.8 3.62 2706 100.0 48325 11539 1.265
Winchester Supreme 780 95.6 57.5 3.73 2702 97.3 52667 11441 1.216
IMR 7828 100.0 55.5 3.59 2666 94.3 46167 12144 1.274
Hodgdon H4831 100.0 55.5 3.59 2665 94.6 49705 11526 1.240
Alliant Reloder-25 100.0 56.8 3.68 2649 98.6 43366 12170 1.315
Vihtavuori N165 100.0 56.5 3.66 2643 97.3 49309 11091 1.258
Vihtavuori N160 100.0 54.7 3.55 2632 95.5 50126 10950 1.245
Hodgdon H1000 100.0 56.5 3.66 2496 91.2 39377 11230 1.373

[Scotch_egg]

Thank you for that info.

 

I think I will start with the N560 as it easier to get hold of locally.

[BlueBoy69]

No problem Scotch_egg.

 

Vihtavouri's reloading data on the 7x64, 160 gr bullets and N560 can be found at the link below.

 

http://www.vihtavuori.com/en/reloading-data/rifle-reloading/7-x-64.html

 

Neil

[ds1]

I would say Viht N560, but be careful there is no free lunch it will be a barrel burner especially with N560 or other high energy double based powders. And no not temperature stable.

[MJR]

Scotch, I've got some H4831sc if you want to try a few rounds with that first.

[Scotch_egg]

Thanks for the offer MJR, I will keep that in mind.