twofewscrews
Member
I've got a Ruger PCC (9mm) zeroed for 17 yards (50'6" exactly according to the range) that shoots 5 inches high at 50 yards, but according to the ballistic calculators I use, ShootersCalculator.com or GunData.org, a 17 yard zero should have me shooting 2 to 2.3 inchs high at 50 yards. A 50 yard zero makes the hold under more extreme then I'm comfortable with and then it should be and simply adds to my confusion. I know that ballistic calculators are a rough mathematical estimate of what should happen, so I'm not expecting it to be 100% right, but when I run other firearms/calibers though them I get number that match up with real life enough to be useful. When I run numbers for my .357 lever gun, .308 and .22lr rifles they match up to within an inch or so.
According to all the ballistic calculators and other peoples experiences I've found online, a 25 yard zero (or 17 yard zero) should have me shooting either dead on or maybe an inch or two high at 50 yards.
I know my hold under/over out to 50 yards, and I understand its a PCC so a 3 inch spread at 50 yards is acceptable.
This isn't an issue of me not being able to hit where I want per se, but it's something that keeps me up at night wondering is it me, the rifle, the ballistic calculator or what?
Here are my numbers
Ammo: CCI Blazer 9mm 115g BC of .147 traveling at an advertised 1145fps. I don't have a chronograph but according to the net I'll gain about 200fps, so lets says its traveling at roughly 1345fps.
Height over bore: 2 inches
Ruger PCC: 16.12 inch barrel with a 1:10 RH twist
Optic: This shouldn't matter but I'm using the PA SLX 1x Microprism
These are my targets from my last trip to the range. My 17 Yard (50 1/2 foot) zero might be a bit off, but I've had this same issue when perfectly zeroed at this distance and 25 yards. I zero at either of these two distances and am still twice as high as I should be according to the ballistic calculator I use. Even if my zero is a bit off these images accurately represent where a 17 yard zero shoots at 50 yards.
The middle is switching from Winchester to CCI and firing from a supported position. 10 shots on each stickie. The top right is confirming zero firing from a supported position. As the barrel heats up the spread tends to shift right. The other three are firing unsupported, 2 shots each, moving from target to target in no particular order.
This is 50 yards. My hold is at the bottom of the blue (5 ring) where it meets black (4 ring). From the bottom of the blue to the yellow is three inches. The yellow inner is 3 inches in diameter. If your inclined to run check my math the line under distance to the bottom line under notes is 1 inch. That is 50 shots with 5 "flyers"
Am I using crappy ballistic calculators? If so, what do you recommend I use?
Should I double check the distance's of both targets at the range? I don't have a laser but I do have a tape measure.
Is this a function of it being a takedown? ie because its a takedown the barrel is flopping about throwing rounds high . . . or something of this nature.
Is there something I am missing all together?
Thanks for your help in advance.
Please feel free to call me an idiot . . . but also please explain why I'm an idiot
According to all the ballistic calculators and other peoples experiences I've found online, a 25 yard zero (or 17 yard zero) should have me shooting either dead on or maybe an inch or two high at 50 yards.
I know my hold under/over out to 50 yards, and I understand its a PCC so a 3 inch spread at 50 yards is acceptable.
This isn't an issue of me not being able to hit where I want per se, but it's something that keeps me up at night wondering is it me, the rifle, the ballistic calculator or what?
Here are my numbers
Ammo: CCI Blazer 9mm 115g BC of .147 traveling at an advertised 1145fps. I don't have a chronograph but according to the net I'll gain about 200fps, so lets says its traveling at roughly 1345fps.
Height over bore: 2 inches
Ruger PCC: 16.12 inch barrel with a 1:10 RH twist
Optic: This shouldn't matter but I'm using the PA SLX 1x Microprism
These are my targets from my last trip to the range. My 17 Yard (50 1/2 foot) zero might be a bit off, but I've had this same issue when perfectly zeroed at this distance and 25 yards. I zero at either of these two distances and am still twice as high as I should be according to the ballistic calculator I use. Even if my zero is a bit off these images accurately represent where a 17 yard zero shoots at 50 yards.
The middle is switching from Winchester to CCI and firing from a supported position. 10 shots on each stickie. The top right is confirming zero firing from a supported position. As the barrel heats up the spread tends to shift right. The other three are firing unsupported, 2 shots each, moving from target to target in no particular order.
This is 50 yards. My hold is at the bottom of the blue (5 ring) where it meets black (4 ring). From the bottom of the blue to the yellow is three inches. The yellow inner is 3 inches in diameter. If your inclined to run check my math the line under distance to the bottom line under notes is 1 inch. That is 50 shots with 5 "flyers"
Am I using crappy ballistic calculators? If so, what do you recommend I use?
Should I double check the distance's of both targets at the range? I don't have a laser but I do have a tape measure.
Is this a function of it being a takedown? ie because its a takedown the barrel is flopping about throwing rounds high . . . or something of this nature.
Is there something I am missing all together?
Thanks for your help in advance.
Please feel free to call me an idiot . . . but also please explain why I'm an idiot
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