flashhole
08-06-2004, 04:25 PM
This is with my Marlin Guide Gun in 45-70. Target distance is 100 yards.
http://img.photobucket.com/albums/v69/GuideGun/1ClickR.jpg
This first picture shows the holes made by my standard load of 58.0 Grains Hodgdon Varget under a Hornady 350 grain RN bullet. I have switched from WLRM primers to CCI 200 primers. The groups are a little better with the non magnum primer.
The line reading 1 Click R shows the difference before and after a minor scope adjustment. 1 click on my Burris Posi Lock scope is not exactly a minor effort but I have been consistently left of center for the past several weeks so I made the adjustment. The vertical stringing is more me than the gun.
http://img.photobucket.com/albums/v69/GuideGun/Win748String.jpg
This second photo is what I would like comment on. The load was Winchester 748 powder in the amounts shown on the backer, same 350 grain bullet with a magnum primer. I didn't find any load data for 748 and a bullet lighter than 405 grains and what I found indicated a need for a magnum primer.
The shot to the left of the black spot was pre scope adjustment. The shot just below the orange spot was post scope adjustment (like in the photo above). Both of these were using the Varget load above.
The 748 loads were shot prior to the scope adjustment. The point of aim for all 748 shots was the center of the orange spot. I don't own a chrony so I can't make any comments about velocity as compared to the Varget loads.
What should I interpret from the hole pattern in the target? 58, 59, 60, 61 and 62 are the grains of powder for the different loads. I held pretty good on all shots so I think the pattern is meaningful. There was no sign of high pressure and I would consider the 60 grain load a full case using the 350 grain bullet with 61 and 62 grains being slightly compressed. I intend to duplicate the test next time out to see if the results repeat themselves. Are there any comments that can be made comparing the Varget loads to the 748 loads?
Any comments are appreciated,
http://img.photobucket.com/albums/v69/GuideGun/1ClickR.jpg
This first picture shows the holes made by my standard load of 58.0 Grains Hodgdon Varget under a Hornady 350 grain RN bullet. I have switched from WLRM primers to CCI 200 primers. The groups are a little better with the non magnum primer.
The line reading 1 Click R shows the difference before and after a minor scope adjustment. 1 click on my Burris Posi Lock scope is not exactly a minor effort but I have been consistently left of center for the past several weeks so I made the adjustment. The vertical stringing is more me than the gun.
http://img.photobucket.com/albums/v69/GuideGun/Win748String.jpg
This second photo is what I would like comment on. The load was Winchester 748 powder in the amounts shown on the backer, same 350 grain bullet with a magnum primer. I didn't find any load data for 748 and a bullet lighter than 405 grains and what I found indicated a need for a magnum primer.
The shot to the left of the black spot was pre scope adjustment. The shot just below the orange spot was post scope adjustment (like in the photo above). Both of these were using the Varget load above.
The 748 loads were shot prior to the scope adjustment. The point of aim for all 748 shots was the center of the orange spot. I don't own a chrony so I can't make any comments about velocity as compared to the Varget loads.
What should I interpret from the hole pattern in the target? 58, 59, 60, 61 and 62 are the grains of powder for the different loads. I held pretty good on all shots so I think the pattern is meaningful. There was no sign of high pressure and I would consider the 60 grain load a full case using the 350 grain bullet with 61 and 62 grains being slightly compressed. I intend to duplicate the test next time out to see if the results repeat themselves. Are there any comments that can be made comparing the Varget loads to the 748 loads?
Any comments are appreciated,