Difference between 45 gr and 55 gr at 400 yds?
- Thread starter ziondogg
- Start date
skinney
Director
Originally Posted By: ziondoggI got a scope that came with a turret for the gun its on- a 22-250. It says to zero @ 100 yds with the turret it came with and then put the 22-250 on. It's meant to work with 55 gr but all wally world had was 45, so how much will it be off at longer ranges using the 45 gr?
its not that hard to true your dope with a round not specified for your scope, 10 grains is going to mean inches @ 400, especially if you shoot in windy conditions.
its not that hard to true your dope with a round not specified for your scope, 10 grains is going to mean inches @ 400, especially if you shoot in windy conditions.
OldTurtle
Moderator - Deceased
Usually, with factory loads, you will find that the 45gr bullets will shoot a little flatter than the 55gr, but are a little more susceptible to wind, so while your elevation might not be that far off, your wind drift may be more..
The only way to determine anything is to spend a little time shooting them..A ballistic program will give you some general information, but range time is the real proof..
The only way to determine anything is to spend a little time shooting them..A ballistic program will give you some general information, but range time is the real proof..
MO1
New member
Originally Posted By: ziondoggIt's meant to work with 55 gr but all wally world had was 45, so how much will it be off at longer ranges using the 45 gr? It'll be off a lot.
Your gun is likely to shoot one or the other more accurately, so unless you test each you won't even know what MOA it will hold. Without knowing how it will group you really have no idea on how it will perform at longer ranges. 2 MOA at 400 yards is 8 inch groups. .75 moa at 400 yards is 3 inch groups. Your point of impact could be off by more than the 45 vs 55 grain ballistic bullet difference, just by your barrel's performance/preference. Bottom line, burn some powder and do the testing - that's the only way you'll really know.
Your gun is likely to shoot one or the other more accurately, so unless you test each you won't even know what MOA it will hold. Without knowing how it will group you really have no idea on how it will perform at longer ranges. 2 MOA at 400 yards is 8 inch groups. .75 moa at 400 yards is 3 inch groups. Your point of impact could be off by more than the 45 vs 55 grain ballistic bullet difference, just by your barrel's performance/preference. Bottom line, burn some powder and do the testing - that's the only way you'll really know.