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need advice on starting loads AA2520/ 22br

Can anyone suggest starting loads for AA2520 and 75- 77 grain bullets? Have a 1-9 barrel, 25" cahmbered for the 22br and would like to get frustratd shooting 600 yd matches, but Im not sure whre to start since theres no data for this powder and the heavier bullets.??
 
AA2520 is on the fast side for the heavy, long bullets. Check out our 22BR Cartridge guide:

http://www.6mmBR.com/22BR.html

Powders to try include Varget, Reloader 15, N550, H4350
 
The loads in the chart and the "suggested" burn rates would indicate that varget and 2520 are near twins. Or is it situation sensitve and wont support the heavier bullet loadings?
 

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