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2 rounds touching 3rd one 1 away everytime what to do?

 
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  #1  
Old 10-18-2009, 08:29 PM
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2 rounds touching 3rd one 1 away everytime what to do?

I am tring to do load development for a 300 win. Had planned to shoot the bigger bullets with it. Ladder test narrowed it down to 74.5 gr of rl 22. Legth is not touching or anywhere near the lands with the 208 amaxes but 190 smks are seated snug in the lands. This thing is absolutly crazy. It will shoot the 1st two almost touching with the 208s and touching with the 190 smks and then throw the next one. Everytime? I thought it could have been mechanical. Checked everything and it is all tight. Traded scopes still the same deal. The barrel is a Rock 5r but is very light. Could it be heating after the 2nd shot? Tomorrow I am going to shoot two then let it get stone cold then come back and shoot two again and see what happens. What are your thoughts?
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Old 10-19-2009, 11:06 AM
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Re: 2 rounds touching 3rd one 1 away everytime what to do?

Try 3 minutes between each shot.
See if that helps.
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Old 10-19-2009, 02:26 PM
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Re: 2 rounds touching 3rd one 1 away everytime what to do?

same thing happened to a friends 300wm. turns out his barrell wasnt floated enough. 1st two shots right on, but then 3rd was way off because barrell got hot and touched the stock.

He filed down the stock a little more to fit a business card all the way down, problem solved, all holes touching.

Mike.
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Old 10-19-2009, 02:50 PM
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Re: 2 rounds touching 3rd one 1 away everytime what to do?

Quote:
Originally Posted by toddconley View Post
I am tring to do load development for a 300 win. Had planned to shoot the bigger bullets with it. Ladder test narrowed it down to 74.5 gr of rl 22. Legth is not touching or anywhere near the lands with the 208 amaxes but 190 smks are seated snug in the lands. This thing is absolutly crazy. It will shoot the 1st two almost touching with the 208s and touching with the 190 smks and then throw the next one. Everytime? I thought it could have been mechanical. Checked everything and it is all tight. Traded scopes still the same deal. The barrel is a Rock 5r but is very light. Could it be heating after the 2nd shot? Tomorrow I am going to shoot two then let it get stone cold then come back and shoot two again and see what happens. What are your thoughts?
Light barrels are notorious for this. It could be the barrel is warming up and buy the third shot
it begins to move around. The barrel does not have to get Hot to the touch just warm.

Try letting it cool off between shots and see if you can eliminate the flyer shots.

If it is for hunting even though you want 5 in the same hole 2 should be enough.

J E CUSTOM
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Old 10-19-2009, 03:05 PM
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Re: 2 rounds touching 3rd one 1 away everytime what to do?

Not to contradict the advice above, but there can be other causes for this too.

Where's the third bullet? If it's at 2 o'clock or 8 o'clock to the group, your stock may be a little too short, which interferes with a consistent grip. Check your LOP, it's free and often effective.
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Old 10-19-2009, 03:53 PM
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Re: 2 rounds touching 3rd one 1 away everytime what to do?

Quote:
Originally Posted by J E Custom View Post
Light barrels are notorious for this. It could be the barrel is warming up and buy the third shot
it begins to move around. The barrel does not have to get Hot to the touch just warm.

Try letting it cool off between shots and see if you can eliminate the flyer shots.

If it is for hunting even though you want 5 in the same hole 2 should be enough.

J E CUSTOM
10-4. Thin barrels will typically open groups as they heat up. Mine start to spread by the 4th shot. If your barrel is a thin tube, it could be spreading by the 3rd shot. Let it cool and please let us know the results?
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  #7  
Old 10-20-2009, 12:37 AM
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Re: 2 rounds touching 3rd one 1 away everytime what to do?

I was also thinking seating depth? If you haven't played with it yet, definately do.

Had a hel of a time getting a guys sendero 25-06 to shoot with 115g nbt's and retumbo just recently. It would do 2 in and 1 out everytime with just about any charge. I finally made up a batch of loads with about 7 different lengths in .015" increments and finally found a decent sweet spot about .090" off the lands. Gave me a 3 shot .3" group. Duplicated it the next time out and sighted it in for the guy, good to go. This is one of the very few rifles that I've worked with that didnt like to be seated out close to the lands. I could tell it wanted to shoot by putting 2 touching or within 1/2", but it would fling the 3rd one 3/4"-1" everytime. I decided that the seating depth was the culprit and that needed to be addressed moreso then powder charge.

Thin barrels also have a reputation for doing this. Try waiting longer inbetween shots say 3-5 minutes. For a hunting rifle, its better to have the first 2 be good and to fling the 3rd, then to have your 1st CB shot be way off, and your next 2 be on, if that makes sense. However its always better to have all 3 go where you want them to!
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