Hello
I'm not a 'new' shooter;I got my first GI Carbine in 1958 from a GI who brouht it home but could not find any ammunition for it.It is as much fun to shoot as any gun that I've ever owned.I shoot it a lot.
Yesterday,at the range,I'm preparing for an upcoming Club Match,and sighting in at warying ranges.
The first dicipline iss 25 yard offhand,and I sighted it in for that.
The next phase is 50 yard foreend rest.With the same sight setting,I'm hitting 3 inches high.
I had to LOWER the red dot sight 2clicks to sight in.
You can be sure that,after a rest,I rechecked the results.
This is my very first experience with RIFLES,lowering the sight for increased range.
I believe that the little gun is influenced by pressure on the barrel
Does anyonne have a similar experience?
Frank

Hello
I'm not a 'new' shooter;I got my first GI Carbine in 1958 from a GI who brouht it home but could not find any ammunition for it.It is as much fun to shoot as any gun that I've ever owned.I shoot it a lot.
Yesterday,at the range,I'm preparing for an upcoming Club Match,and sighting in at warying ranges.
The first dicipline iss 25 yard offhand,and I sighted it in for that.
The next phase is 50 yard foreend rest.With the same sight setting,I'm hitting 3 inches high.
I had to LOWER the red dot sight 2clicks to sight in.
You can be sure that,after a rest,I rechecked the results.
This is my very first experience with RIFLES,lowering the sight for increased range.
I believe that the little gun is influenced by pressure on the barrel
Does anyonne have a similar experience?
Frank

With the red dot up above the bore, the sight line is HIGHER than the bore line, so for the two to intersect at 25yards, the sight line has to be angled downward to intersect the bullet's trajectory....with that slight downward sight angle, the bullet would land high until it's dropped enough to cross the line of sight again (probably at something like 85yards for the .30carbine...depends on how high that red dot is mounted).


So Yeah, it's a pretty common problem...if sighted dead on at loger ranges (like 50yards in this case) would land high at ranges in the middle (like 25yards).

Shooting of a rest will usually make the bullet strike higher. A lot of other factors come in also. You have to check your zero from other positions as well.

With the red dot up above the bore, the sight line is HIGHER than the bore line, so for the two to intersect at 25yards, the sight line has to be angled downward to intersect the bullet's trajectory....with that slight downward sight angle, the bullet would land high until it's dropped enough to cross the line of sight again (probably at something like 85yards for the .30carbine...depends on how high that red dot is mounted).


So Yeah, it's a pretty common problem...if sighted dead on at loger ranges (like 50yards in this case) would land high at ranges in the middle (like 25yards).

Thanks,Guys,for the input
With all the range time that I loogged over the years,the only sighting in with a rifle at 25 yards was with my Trapdoors,and squib loads with Bullseye and Red Dot powders.These were with iron sights,and the problem never ocurred.
Frank

Thanks,Guys,for the input
With all the range time that I loogged over the years,the only sighting in with a rifle at 25 yards was with my Trapdoors,and squib loads with Bullseye and Red Dot powders.These were with iron sights,and the problem never ocurred.
Frank


Good to see you shooting again, and the 30carbine can shoot better than many people give it credit for (besides being one of the more fun semi-atuos to deal with).

Odd things hapen when sights get jacked up over the bore..and the recent tend to high mounts/big lens scopes seem to make a differnce. Once had a little computer ballistc program that let you choose the scope mount height and plot trajectories...moving it up let you see the effexts at very short or very long ranges.

There's also the possiblility that your head/eye relief is different between standing and supported position given different impacts. Most logical is that the bullet is still rising to its highest trajectory before falling back down.

CD

There's also the possiblility that your head/eye relief is different between standing and supported position given different impacts. Most logical is that the bullet is still rising to its highest trajectory before falling back down.

CD

I tend to agree with the barrel support changing point of aim point of view.
Origionally I intended to use a sling for the offhand course,but abandoned it because the sling moved the POI 2 inches to the left,and created sighting realignment problems.
Frank