wally
Member
I just picked up a Ruger Precision Rimfire and mounted a Primary Arms 4-14X FPP R-Grid Xmas tree reticle. Zeroed it 3" high at 50 yards, tweaked it a bit shooting steel plates at 100 yards and then moved to 200 & 300 yards.
Needed to hold about 6.5 mil at 200 and ~12mil at 300. Heck of a lot of fun. Had a head wind of about 10 mph that was pretty variable which made the 300 yards shots pretty challenging, but by the time I was done, I was ringing the 8" plate about 12 of 15.
I notice that in my ballistics calculator the Aguila 40gr "standard velocity" I was using with a 100 yard zero is a pretty good analog at 200 & 300 yards to the 155gr .308 I've been using at 400 & 600 yards in terms of drop and drift.
.22LR 200/300 .308 400/600
PATH: -32.8/-108.5" -30.1/-103.6"
TOF: 0.60/0.95 sec 0.56/0.93 sec
DRIFT: 12.7/26.9" 16.6/41.8"
The drift looks pretty far off in terms of "inches" but in terms of MILs its 1.7/2.4 for the .22lr and 0.76/1.9 Since I plan to mostly dial for elevation and hold for wind I think it'll help when I do get to shoot longer ranges. The .308 drift at 300 yard is 0.82 MIL so my .22lr reads should drictly apply to my 300 yard .308 shooting.
Anyone else using a "precision 22lr" rifle at 300 yards as an analog for higher calibers at longer ranges in hopes of improving their ability to "dope the wind"? Since 300 is a far as I can get for the time being, my hope is what I learn with RPR will translate to the .308 when I get to shoot longer ranges.
Needed to hold about 6.5 mil at 200 and ~12mil at 300. Heck of a lot of fun. Had a head wind of about 10 mph that was pretty variable which made the 300 yards shots pretty challenging, but by the time I was done, I was ringing the 8" plate about 12 of 15.
I notice that in my ballistics calculator the Aguila 40gr "standard velocity" I was using with a 100 yard zero is a pretty good analog at 200 & 300 yards to the 155gr .308 I've been using at 400 & 600 yards in terms of drop and drift.
.22LR 200/300 .308 400/600
PATH: -32.8/-108.5" -30.1/-103.6"
TOF: 0.60/0.95 sec 0.56/0.93 sec
DRIFT: 12.7/26.9" 16.6/41.8"
The drift looks pretty far off in terms of "inches" but in terms of MILs its 1.7/2.4 for the .22lr and 0.76/1.9 Since I plan to mostly dial for elevation and hold for wind I think it'll help when I do get to shoot longer ranges. The .308 drift at 300 yard is 0.82 MIL so my .22lr reads should drictly apply to my 300 yard .308 shooting.
Anyone else using a "precision 22lr" rifle at 300 yards as an analog for higher calibers at longer ranges in hopes of improving their ability to "dope the wind"? Since 300 is a far as I can get for the time being, my hope is what I learn with RPR will translate to the .308 when I get to shoot longer ranges.