Thread: Win BRA 740 and 770 powders

Greetings all,
Win BRA 740 and 770 powders are listed in the old Cyril Waterworth manuals and I am wondering if anybody knows anything about them. 740 is about the same speed as IMR3031 or a little slower than AR2201. 770 is slower around IMR4064. I suspect they may be surplus military powders packed in Aus as was 4740 but would like to know for sure.
Thanks and regards Grandpamac.

Originally Posted by grandpamac

Greetings all,
Win BRA 740 and 770 powders are listed in the old Cyril Waterworth manuals and I am wondering if anybody knows anything about them. 740 is about the same speed as IMR3031 or a little slower than AR2201. 770 is slower around IMR4064. I suspect they may be surplus military powders packed in Aus as was 4740 but would like to know for sure.
Thanks and regards Grandpamac.

Greetings all,
Lots of views but no replies. It was a long shot anyway. The interweb has produced next to nothing as well. Thinking about it Winchester produced powder for the military from WW2 onwards (or a little earlier) and only offered it to the public from 1960. The use of the three number code beginning with 7 and the letters BR in the prefix are roughly similar to the later 748BR and 760BR. Additionally 740 is close to 748 and 770 to 760 in speed so perhaps these were powders used in Winchester commercial ammo and exported as bulk powder prior to 1960 before they were upgraded to cannister powders. Perhaps I will just go with that.
Regards Grandpamac.

I have some 760 here which was from pulled army 303s but haven't used it yet so sorry I can't be of more help

https://www.gunsandammo.com/editoria...-powder/462658
https://www.theballisticassistant.co...owder-catalog/

i see St Marks make Winchester powder and there is WC740 and WMR770 among others with similar numbers so could be surplus or recycled Military powders.We recycled 30/06 powders and called it all #4831 though each batch was different. 5010 powder was salvaged from 50BMG and with no reload data we just filled the case and crimped to help the powder burn.

I suspect these were locally recycled powders from 30/06 or 303 as Data from Cyril Waterworth spans 22/250 to 270 to 308 quite a range.

Greetings @tedZ and all,
I had a good check through my older load data and found BRA740 to be close to W748BR and BRA770 to be close to W760BR. the two BR powders were canister powders offered to the public from, I think, 1960. The BR suffix was dropped in the 1970's. The two BRA powders were almost certainly bulk powders imported to Aus for domestic ammo production in the 1950's and 60's and packaged for sale there. ADI produced it's first canister powder, AR2206, in 1979 and the rest is, as they say, history.
Regards Grandpamac.

@grandpamac googled WIN BRA 740 and found WINEBRA 740 so the internet takes us on some strange directions.

https://wineovation.com/collections/...of-booze-black