3rd shot fliers

[7mmfan]

On my most recent load testing outing, I was experiencing the 3rd shot flier phenomenon. My first 2 shots were frequently touching and the 3rd would fly. You more experienced reloaders/shooters, is this just a heat issue? Or is this indicative of something else going on between the gun and load that it doesn't like? I love the bullets touching but then the 3rd frustrates the heck out of me. My logical mind tells me I only need 1 or 2 shots to get the job done, but my data driven mind tells me something can be improved upon here.

[CaNINE]

It could be a thousand different things but often I’ve found groups like that suggest you may be getting close to a node.  Start fine tuning your seating depth 10 thou in either direction.

Or you could have a heat up issue and contact point changing harmonics.

[jasnt]

Does it do this with any other loads?

[7mmfan]

This is the first load that had anything that resembles good accuracy in this rifle. Lower charge had a very nice tight 3 shot group, and as I've increased the charge this is happening. It just seems that there's a lot of potential there, but maybe it's not worth chasing since the lower charge is quite accurate.

[Stein]

Are you shooting through a chrono?  Since it's the 3rd shot, it seems to hint at either barrel heating or the thing that presses the trigger...

I try to keep a consistent cool down period, I set a 3 minute timer on my phone to space the shots out equally and try to reduce that variable.

[7mmfan]

I am shooting through a chrono, but I haven't noticed anything obvious there. This gun gets hot fast, I try to wait at least 1 minute between shots and 20 between groups. I'm not ruling me out of the equation, but when I check back in with the known quality loads I get the same quality results, so I feel like I'm doing my part.

It's fine, I'm really just fussing over loads that show potential but only gain me about 50-75 fps, so I should just can it and stick with the load I know is quality.

[Stein]

Yeah, I did the same thing and was looking at 100 fps better, but pushing the edge of overpressure and really touchy nodes, so I ended up going back to the load I found shooting groups years ago before I had a chrono.

It is fun to experiment, but I always seem to go back to what's proven.

[fishngamereaper]

Probably barrel heating. Have you fired 4th and 5th rounds to see where they pattern.

Normally the cold bore is the "flier" and the follow up shots are more indicative of your load accuracy.

[7mmfan]

I haven't. I normally do 3 shot groups because the gun heats up so fast and takes a while to cool. I have noticed my first couple shots after cleaning can be a bit erratic but seem to come back to normal by my 3rd. I never hunt with a clean gun because of it.

[BULLBLASTER]

Try keeping shot strings to 2 at a time but continue to shoot at the same spot for multiple strings.

[7mmfan]

That's a good call. I'll try that next time out.

[HighlandLofts]

I have a Remington 788 in 243 that I loaded 100 grain pointed soft points. I had four different types of bullets and each bullet shot different with the same powder. Some liked the low end, one liked the mid range and one liked the high end range. All shot from a gun cradle.
Then I loaded all four projectiles  with the same powder, same ame primer and there was one projectile that loked that charge.
It's a fun game figureing it out.

[Bob33]

Do the first two shots always go to the same point of impact? Shoot a group and take the target home. Come back another day and shoot the same target. If the first two shots from a cold barrel always go to the same point of impact then barrel heat or bedding are the likely candidates for the third shot moving. For a hunting rifle I could live with a gun that always puts the first shot or two in the same spot.

[Bango skank]

take your 2 shots, go screw off for 10 minutes, come back and take a third shot

[7mmfan]

take your 2 shots, go screw off for 10 minutes, come back and take a third shot

This is what I'll start off with.