Hello there.
I have recently commenced an excercise of load testing my Ruger M77 Ultralight (circa 1990) as a result of the discontinuation of my favourite powder, ADI's AR2206 for its replacement AR2206(H) which has a slightly lower burn rate.
I have another shoot on or around the 22 May to finalise my testing, but thought this might be a good place to log my results for the benefit of future shooters in this calibre.
There is also some other test details for .22/250 Rem on the same sheet, but I figure these are more common
Note: All powders are ADI, details of which can be found here
First Off:
Test Conditions:
benchrest, 100m, Temp 24degrees C, no wind
3 round firing, 20 mins break to refire.
Rifle: Ruger M77 Ultralight 20" barrel
Bullet weights, brands and reloading data is on the table below, as are links to targets
For full spreadsheet and results to date
http://home.comcast.net/~hawkjay/data/vorg/Tables_Rev2.htm
Alternatively,
http://users.on.net/~vortrog/reloading/Tables%20Rev2.xls
In summary,
I think the shorter and lighter barrel prefers the faster burning powder which seems to make sense...not as much accelleration time in the barrel.
Also, I need to push the load up over the recommended loading to try and get the same performance I was used to with AR2206 (I was gettting 1.36 MOA with 42.5gns of AR2206)
My next session will be on the 15 May where I will push out some marginally hotter loads
I hope this is helpful or informative
I have recently commenced an excercise of load testing my Ruger M77 Ultralight (circa 1990) as a result of the discontinuation of my favourite powder, ADI's AR2206 for its replacement AR2206(H) which has a slightly lower burn rate.
I have another shoot on or around the 22 May to finalise my testing, but thought this might be a good place to log my results for the benefit of future shooters in this calibre.
There is also some other test details for .22/250 Rem on the same sheet, but I figure these are more common
Note: All powders are ADI, details of which can be found here
First Off:
Test Conditions:
benchrest, 100m, Temp 24degrees C, no wind
3 round firing, 20 mins break to refire.
Rifle: Ruger M77 Ultralight 20" barrel
Bullet weights, brands and reloading data is on the table below, as are links to targets
For full spreadsheet and results to date
http://home.comcast.net/~hawkjay/data/vorg/Tables_Rev2.htm
Alternatively,
http://users.on.net/~vortrog/reloading/Tables%20Rev2.xls
In summary,
I think the shorter and lighter barrel prefers the faster burning powder which seems to make sense...not as much accelleration time in the barrel.
Also, I need to push the load up over the recommended loading to try and get the same performance I was used to with AR2206 (I was gettting 1.36 MOA with 42.5gns of AR2206)
My next session will be on the 15 May where I will push out some marginally hotter loads
I hope this is helpful or informative
