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Started By
Message
A rule of thumb on changing point of impact on fixed sighted guns
Posted on 9/15/14 at 7:31 pm
Posted on 9/15/14 at 7:31 pm
Slower rounds shoot higher.
Faster rounds shoot lower.
#themoreyouknow
ETA: For identical projectiles.
ETA#2: My personal experience is with handguns at 'typical' target distances.
Faster rounds shoot lower.
#themoreyouknow
ETA: For identical projectiles.
ETA#2: My personal experience is with handguns at 'typical' target distances.
This post was edited on 9/16/14 at 8:20 pm
4
Posted on 9/15/14 at 7:38 pm to weagle99
Explain this to me with rudimentary physics
Posted on 9/15/14 at 7:41 pm to Boats n Hose
A slower bullet will be in the barrel for a longer time and be influenced by the recoil impulse (upwards) more than a faster bullet.
That is my understanding.
That is my understanding.
Posted on 9/15/14 at 7:42 pm to weagle99
I've heard Hickok45 say this many times. But never understood why.
Posted on 9/15/14 at 7:43 pm to weagle99
Gotcha
Posted on 9/15/14 at 7:53 pm to weagle99
quote:
A slower bullet will be in the barrel for a longer time and be influenced by the recoil impulse (upwards) more than a faster bullet.
Crazy until you really think about it in these terms.
Makes sense. You just made me more edjumucated.
Posted on 9/15/14 at 8:05 pm to weagle99
quote:
A slower bullet will be in the barrel for a longer time and be influenced by the recoil impulse (upwards) more than a faster bullet.
Very true. My .460 S&W mag shoots .45 LC, .454 casull, and .460 magnums. That is the order of slowest to the fastest, and the 45 is a good 6-10 inches higher than the .460 at 30 yards.
Posted on 9/15/14 at 8:12 pm to REB BEER
Thought it was more of a trajectory thing because the heavier bullets "rainbow" more. Larger bullets also work better with a less aggressive twist. IIRC
Probably takes more work to twist a heavier bullet.
Probably takes more work to twist a heavier bullet.
This post was edited on 9/15/14 at 8:13 pm
Posted on 9/15/14 at 8:19 pm to bapple
Posted on 9/15/14 at 8:34 pm to Hu_Flung_Pu
quote:
arger bullets also work better with a less aggressive twist. IIRC
I think the opposite is true.
Old Colt SP1 rifles with 1:12 twist can't effectively stabilize heavier .223 bullets like the later 1:7 twist models.
This post was edited on 9/15/14 at 8:35 pm
Posted on 9/15/14 at 8:36 pm to weagle99
I thought the 1:7 was for the heavier bullets and the 1:9 was for 55gr
Posted on 9/15/14 at 8:39 pm to Hu_Flung_Pu
Eta: nevermind. I'm stupid.
This post was edited on 9/15/14 at 8:40 pm
Posted on 9/15/14 at 8:42 pm to Hu_Flung_Pu
quote:
I thought the 1:7 was for the heavier bullets and the 1:9 was for 55gr
1:7 is a more aggressive twist and works with heavier bullets unless my understanding is wrong.
Posted on 9/15/14 at 8:43 pm to DownshiftAndFloorIt
Wait. Wait. Wait yeah it's 1 for every 7" vs 9" so the 7" is more aggressive. Makes sense now in my head. My right side was saying wtf to my left side. All feels right now. Ha
Eta: just to let everyone know, I was writing my response before weagle
Eta: just to let everyone know, I was writing my response before weagle
This post was edited on 9/15/14 at 8:45 pm
Posted on 9/15/14 at 8:44 pm to Hu_Flung_Pu
Barrel length will play a role in all of this also.
Posted on 9/15/14 at 8:50 pm to weagle99
Wait wait wait
If y'all are right, why is a .45/70 usually like 1:20 and a .223 is 1:7????
If y'all are right, why is a .45/70 usually like 1:20 and a .223 is 1:7????
Posted on 9/15/14 at 8:57 pm to DownshiftAndFloorIt
I'm speculating but it may relate to the shape of the slug and the casing size. 70mm vs 45mm
Magnum loads are usually less aggressive. Might be the time allotted within the barrel won't allow for a more aggressive twist. Again just guessing.
Maybe the ratio from velocity to twist is proportional to smaller loads.
Magnum loads are usually less aggressive. Might be the time allotted within the barrel won't allow for a more aggressive twist. Again just guessing.
Maybe the ratio from velocity to twist is proportional to smaller loads.
This post was edited on 9/15/14 at 9:01 pm
Posted on 9/15/14 at 9:00 pm to DownshiftAndFloorIt
there is a formula based on bullet mass diameter & length
Posted on 9/15/14 at 9:01 pm to Hu_Flung_Pu
I think y'all are wrong.
Posted on 9/15/14 at 9:24 pm to weagle99
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