poi movement in load development 300 win mag

R

retired

New member
i put together an inexpensive 300 win mag target rifle.
just started load development,,,berger 230 at over 2800 fps
i just did three 3 shot groups from some earlier data.
load 1 went 2" right of center, elevation fine. at 200 yards
load 2 went 4" right
load 3 went 8" right
elevation always good, new nf 12-42x,
these are 0.2 grain powder increments.
anyone ever seen such movement >( this bbl is a krieger truck axle nearly an inch at the muzzle.
or
is the brand new scope bad ?

wtf
 
ok i do not think it is a bad scope...it shot 3 shot groups at each point of impact.
i have just never seen a poi move so much with such a small change in load.
 
retired said:
i put together an inexpensive 300 win mag target rifle.
just started load development,,,berger 230 at over 2800 fps
i just did three 3 shot groups from some earlier data.
load 1 went 2" right of center, elevation fine. at 200 yards
load 2 went 4" right
load 3 went 8" right
elevation always good, new nf 12-42x,
these are 0.2 grain powder increments.
anyone ever seen such movement >( this bbl is a krieger truck axle nearly an inch at the muzzle.
or
is the brand new scope bad ?

wtf
Click to expand...
there is obviously something wrong. A .2 grn Powder change in a case that large is negligible.

Is the barrel tight enough? Maybe Check the scope mounts. Put another scope on and see what happens.
 
bbl torqued to 150
solid mount, cannot find anything loose, new scope.
but i agree change the scope is a simple check.

thanks

jackie schmidt said:
there is obviously something wrong. A .2 grn Powder change in a case that large is negligible.

Is the barrel tight enough? Maybe Check the scope mounts. Put another scope on and see what happens.
Click to expand...
 
IMO the first thing you need to do is eliminate some variables.... for instance repeat the sequence with three groups of load #1, follow with three groups of load #3

Are all the #1 loads 2" to the right?

No 3 load?

I don't think three 3-shot groups shows anything
 
al,
it exhibited a similar movement when i shot the first ladder, but those were all single shots.

i might try with loads 2 and 3,( 1 was not a good group)

thanks

alinwa said:
IMO the first thing you need to do is eliminate some variables.... for instance repeat the sequence with three groups of load #1, follow with three groups of load #3

Are all the #1 loads 2" to the right?

No 3 load?

I don't think three 3-shot groups shows anything
Click to expand...
 
so i am going to re-shoot with a second scope,
but alas i have no name brand scopes for 200 yards.
i am going with a early taiwan 4-16x at 100 yards.
i actually reloaded the same cases with the same loads,
plus 5 for sight in. will remove the current scope and rings
and go with new rings with this scope.
 
That’s a lot of movement for a 230 at 200 yds with only .2 gr difference. All signs point toward scope or mounting setup. Even a dorked up crown shouldn’t do that. Curious to see what it ends up being
 
JBM
230GR 30 CAL AT 2900 FPS
4900 FT, 87*/20%
WITH A 100 YARD ZERO
a SIXTY MPH wind will move that bullet 7.9 inches
there is a reason to shoot big heavy bullets at long range.
for the record, maybe 1 mph with 2-3mph gusts..few and far between.


retired said:
you do the calculation
230 gr 30 call bullet
2900 fps
how much wind to move the bullet EIGHT INCHES at 200 yards?
( oh and remember, it shot GROUPS each time, no flyers)
Click to expand...
 
you need to learn how to use software.
and read.
quickload:
1.3 at 200 in a 10 mph wind ,
is NOT 10.4 at 20 mph.

go read the input data and try again
maybe consider some common sense in your answer.



JerrySharrett said:
According to QUICKload a 20mph wind will move that bullet 10.4" at 200yards.


So????

.
Click to expand...
 
retired said:
you need to learn how to use software.
and read.
quickload:
1.3 at 200 in a 10 mph wind ,
is NOT 10.4 at 20 mph.

go read the input data and try again
maybe consider some common sense in your answer.
Click to expand...


Run YOURE numbers again dodo.

And recalibrate your finess smartass!!!!

.
 
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