why do jacketed bullets shoot higher than cast

J

jbunny

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centeral BC
i havejust bought a TC contender in 10 mm auto with a
14 in barrel. the factory 180 gr jacketed crono at 1240 fps shoots
center of bull at 50 yds. i loaded a bunch of 175 gr cast that crono at 1400 fps and they shoot 10 inches low at 50 yds.
why such a big difference????? are rifles affected like this
also??????. i have no experience with cast bullets. i did not make these cast bullets, i bought from a reputible maker.
TIA
Louis
 
The faster bullets got out of the barrel sooner and therefor are effected less by muzzle rise of the gun. :confused:
 
The cast bullet is spending far less time in the barrel so is out of the barrel before it rises very far.

The heavier bullet takes longer to exit the barrel (you're velocities prove this) so the barrel has far more time to jump up resulting in the bullets hitting at the different impact points.

No the bullet construction has nothing to do with it...
 
The slower bullet will hit higher in my experience....don't think it makes a diff. whether cast or condom bullet.
 
ben hunchak said:
The slower bullet will hit higher in my experience....don't think it makes a diff. whether cast or condom bullet.
Click to expand...
the jacketed shoot higher . the cast shoot lower eventhough they are going faster. i have talked to other shooters and a they claim the same thing but nobody
knows why?????? am in the process of making myself
a deacellerator grip with a thumb rest so it will be aweek
or so before i go testing again.
 
jbunny said:
but nobody
knows why??????
Click to expand...
Several people have just now told you why - the slower bullet is in the barrel longer and is more affected by recoil, which pushes the muzzle up and causes the bullet to impact higher. It isn't rocket science, and is a well-known phenomenon especially among silhouette shooters.
 
jbunny said:
the jacketed shoot higher . the cast shoot lower eventhough they are going faster. i have talked to other shooters and a they claim the same thing but nobody
knows why?????? am in the process of making myself
a deacellerator grip with a thumb rest so it will be aweek
or so before i go testing again.
Click to expand...
If safe, try to reduce/increase the velocity of the loads so that they are the same. I am curious that 160 fps would account for such a difference.
 
Faster bullets will shoot lower. As noted by others here, the faster bullet has less barrel time. The barrel starts rising as soon as the cartridge fires & the faster bullet leaves as the barrel is pointer lower.
You can use this feature to adjust where the bullet hits . Handy with fixed sights.
Having said that however, 10 inches at 50 yards does seem like a lot.
 
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