I have mostly Remington 510 series and 580 series 22 RF rifles and they don't seem to picky as far as ammo. I was surprised by a couple of comments on different blogs as to what people like and hate about different ammo from different manufacturers. So I decided to take a 22 rimfire (a Winchester with a 4 power scope mounted on it) that I had only sighted in with a certain brand of ammo and have taken it out to a range on the prairie the other day as I was also checking a 223 for a planned prairie dog shoot. The wind was about 30 miles per hour and it was gusting. I shot with the wind and was surprised how much the group sizes varied - 1" groups up to 5" groups. I was shooting at 75 yards. Today I took it out to a range in the hills and that range was protected from the wind. I was shooting off bags and comparing two brands of ammo - both LR hollow points in bulk packages and they were both the top of the line ammo for these two companies. I shot at 25 yards today.
Brand "A" was shooting about 1/2" groups (3 and 5 shot groups - holes touching)
Brand "B" was shooting about 2" groups.
Brand "A" is the ammo I shoot most of the time with all my 22's and Brand "B" was something I pick up on sale now and then. These two manufacturers were two of the top three 22 RF ammo manufacturers, I think -- maybe the two top manufacturers. Besides the different group sizes I was surprised at the different point of impact - it was significant > 4" at 25 yards.
Lesson learned. Even with the 22 RF sight the rifle in with the ammo that your going to use and if it doesn't shoot accurate enough try other brands. If you are going to shoot a different brand of ammo, check the point of impact.
Brand "A" was shooting about 1/2" groups (3 and 5 shot groups - holes touching)
Brand "B" was shooting about 2" groups.
Brand "A" is the ammo I shoot most of the time with all my 22's and Brand "B" was something I pick up on sale now and then. These two manufacturers were two of the top three 22 RF ammo manufacturers, I think -- maybe the two top manufacturers. Besides the different group sizes I was surprised at the different point of impact - it was significant > 4" at 25 yards.
Lesson learned. Even with the 22 RF sight the rifle in with the ammo that your going to use and if it doesn't shoot accurate enough try other brands. If you are going to shoot a different brand of ammo, check the point of impact.