Group opening up at 200yrds.

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Ok I have been working up a load for my 30-06.
Hornady brass
57g H4350
CCI 250
165g interlock SPBT
COL 3.210"

At 100yrds I am about 1.180" 4 shots
When I take it out to 200yrds they open up to 4.470"

Any ideas on what may be causing this.
 
Odd.

Most loads are fairly linear in accuracy until you start stretching out further than that usually, as it takes time for environmental factors to effect the bullet's flight.

Possible options:

-Shooter error via. scope/ iron sights, or position.
-Wind? Unlikely to have much of an effect at that distance.
-Unsuitable bullet weight for twist of rifling? Tumbling or improperly stabilized bullet?

Have you tried confirming the load again back at 100 yards to confirm the gun/ shooter is not a possible issue?

Just thinking out loud here...
 
Yes after the first set at 200yrds I took it back to 100 and shot a 1.240" group. Took it back to 200yrds and shot another 4"+ group.
I let the bbl get cool to the touch Inbetween shots.
All shooting was don't from a sled so shooter error is minimal.

Same time I shot a .243 .494" @ 100yds
Then .800" @ 200yds.
 
Rifle is a older midland 30-06. Scope is weaver K6.
I was aiming in the middle of a "champion" paper target
Red and white with a 1" grid system.

Total piece of paper is 16"X16".
 
Factory ammo and my hand loads all shoot around the 1" mark at 100yrds.
Mostly 165g stuff.
180g factory never shot very good so I have not bothered loading any in that weight.
 
What about the holes - all tiny, or do you see tumbling/keyholing? (shouldn't be happening at 200, but just looking for something to account for what happens in the last 100yds.
 
One thing I would try if it was me is try a different operator.

Just to get the peace of mind that it is something in the components , I am in no way saying it IS you, it is just nice to have a second shooter.

It won't be bullet weight vs twist rate when the range of what 30-06 can use effectively is a wide range for factory twist offerings.

I have a 6X on my BLR that does excellent at 100 but to go 200 and it gets difficult to repeat your hold when you squeeze of a shot due to the range and reticle, I also use a front Br Rock and rear bag when testing.

Details on the rifle?

Environmental conditions?

Bullet condition?

Velocity?

How thick is the reticle vs target grid?
 
I've done that with a pistol. "Huh... OK, I guess it was me :)" Mind, he's using a sled - not much he can flinch or pull with that setup.
 
it is a aiming error......it is to hard to see the red/white target at 200 yards with a 6 power scope, red is fine for 100 but at 200 you want black.
the edges of the red blur out to much, if your misreading the target 1 inch left and then 1 inch right between shots and you should be shooting a 2.5 inch group then that will account for a 4 inch group....try a different target or put a higher mag scope on it, either way your still holding a good enough group for deer at 200 for a midland rifle, a fine utilitarian hunting rifle yet poor choice as a precision group if your looking to shoot targets....
 
Kelly Timoffee said:
One thing I would try if it was me is try a different operator.

Just to get the peace of mind that it is something in the components , I am in no way saying it IS you, it is just nice to have a second shooter.

It won't be bullet weight vs twist rate when the range of what 30-06 can use effectively is a wide range for factory twist offerings.

I have a 6X on my BLR that does excellent at 100 but to go 200 and it gets difficult to repeat your hold when you squeeze of a shot due to the range and reticle, I also use a front Br Rock and rear bag when testing.

Details on the rifle?

Environmental conditions?

Bullet condition?

Velocity?

How thick is the reticle vs target grid?
Click to expand...

Not sure what details you need.
It's not bedded.
Bbl is floated.
Decent trigger

Weather : clear, +6 Celsius, slight breeze

Bullets are new, clean , first time being seated.

Don't have a crony. So not 100% on velocity
If I went by manuals aprox 2750-2850fps
 
Anyone think it may be cooper fowled?
I noticed a little on one of the rifleing lands near the muzzle. It's don't look like a whole lot. Barely spotted it.
 
I had a rifle that shot just under an inch at 100 yards repeatedly and would hardly hold a 5" group at 200 yards with a 7wsm in an autoloader browning. I to was stumped on a cause but sold the rifle thinking dam autoloaders don't shoot worth a darn. Kept the scope and put it on .338 win and that rifle would not hold 3" at 100 yards. Swapped scopes and voila 1" no problem. I sold the autoloader thinking that was the problem but in reality the scope was the issue. Never got a chance to try my theory as gun was sold but it seemed the scopes problem was exaggerated by the increase in recoil. I would start with the scope.
 
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