cwskirmisher
09-18-2010, 10:14 AM
I recently took my model 1936 out to test some handloaded boolits for the upcoming deer season. I also had a box if Winchester factory loads (32 Win Spl) in 170 gr silvertip.
The gun has a Lyman #56 aperture sight on the receiver (it was there when I acquired the gun) and the original front dovetailed sight. At some point, the original rear leaf sight was removed and a dovetail blank was installed. Every load I shot at 100 yards was 10-12" high, including the factory load, and the rear sight is as far down as it can go (it is sitting right on top of the receiver). The groups were OK, but I figured that my handloads are around 1250 fps and the factory load is somewhere in the 1500-1800 fps arena. So, I figured I have two choices - either reduce the handloads to a MV somewhere below 1100-1200fps and see if the boolit drops to the sights at 100 yards (doubtful it will drop that much), or find a higher front sight. I don't think lowering the MV is the right soluton - I am not sure how the boolits will perform on game much slower than 1200 fps. I went to my local smith, who ordered me a Marbles bead front sight that generally looks exactly like the original - but .570 tall, which is the tallest they sell. I am hoping that will get my groups down to the sights - after all I can always raise up the rear aperture if they go too low...
So. if I did my math correctly (sight radious is 22"), I need to raise my front sight .073 to get the bullet impact to drop 12"? The original front sight is .4375 tall, so that means I would need a front sight that is .510. I hope the .570 will work. The additional .060 should drop the bullet an additional 10" if the math works - giving me good adjustment range for the rear sight. That is if I did the math correctly.
Any other suggestions? I don't want to put a standard leaf rear sight on the gun as I really like the old Lyman aperture, and I really like this Marlin 1936 and want to take it afield.
The gun has a Lyman #56 aperture sight on the receiver (it was there when I acquired the gun) and the original front dovetailed sight. At some point, the original rear leaf sight was removed and a dovetail blank was installed. Every load I shot at 100 yards was 10-12" high, including the factory load, and the rear sight is as far down as it can go (it is sitting right on top of the receiver). The groups were OK, but I figured that my handloads are around 1250 fps and the factory load is somewhere in the 1500-1800 fps arena. So, I figured I have two choices - either reduce the handloads to a MV somewhere below 1100-1200fps and see if the boolit drops to the sights at 100 yards (doubtful it will drop that much), or find a higher front sight. I don't think lowering the MV is the right soluton - I am not sure how the boolits will perform on game much slower than 1200 fps. I went to my local smith, who ordered me a Marbles bead front sight that generally looks exactly like the original - but .570 tall, which is the tallest they sell. I am hoping that will get my groups down to the sights - after all I can always raise up the rear aperture if they go too low...
So. if I did my math correctly (sight radious is 22"), I need to raise my front sight .073 to get the bullet impact to drop 12"? The original front sight is .4375 tall, so that means I would need a front sight that is .510. I hope the .570 will work. The additional .060 should drop the bullet an additional 10" if the math works - giving me good adjustment range for the rear sight. That is if I did the math correctly.
Any other suggestions? I don't want to put a standard leaf rear sight on the gun as I really like the old Lyman aperture, and I really like this Marlin 1936 and want to take it afield.