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#7195839 - 06/12/18 01:13 PM Things I've seen to cause accuracy issues.....
ChadTRG42 Offline
THF Celebrity

Registered: 09/16/09
Posts: 12868
Loc: Lewisville, TX
I've recently had a few, what I call, "problem rifles", come to me for load work ups. Some were factory rifles and some were full customs that the customer said shot bad or "were all over the place." But I see the same issues on a lot of rifles. Sure, there are some exceptions to the rules, but these items will cover most of the issues I see.

1- free floated barrel. Precision bolt rifles shoot best, and the most consistent, with a free floated barrel. A lot of your rifles that "walk" around or shoot stringing groups do not have free floated barrels. The stock will make contact and cause a pressure point once the barrel heats up. The more it heats up, the more it walks around.

2- free floated bolt. I have seen many rifles where when you close the bolt, the bolt makes contact on the stock. The bolt now has a pivot point or stress point during firing to cause consistency issues. I had a full custom come to me recently that had the barrel touching the stock and the bolt making hard contact with the stock once the bolt was closed. I free floated to barrel and shot again. Groups were poor and stringing shots. I inspected the rifle again and found the bolt making hard contact to the stock. I Dremelled out the contact area and re shot the rifle, and now we shot good! Groups were very tight and no stringing.

3- Good scope mounts. I've seen several recently where the mounts were poor, and had come loose. Some mounts will come loose more than others. But if you start getting bad accuracy all of a sudden, stop and go back to the basics and check your action screws, mounts, rings, and bases.

Check these items, and it will help you gain more consistency and help with your accuracy.
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#7195889 - 06/12/18 02:15 PM Re: Things I've seen to cause accuracy issues..... [Re: ChadTRG42]
Dalee7892 Offline
Veteran Tracker

Registered: 05/04/15
Posts: 2211
Loc: Denton County
Chad, back in the day to check clearance on rifle barrel use a dollar bill slide between barrel and stock. Is this good today? Just wondering.

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#7195899 - 06/12/18 02:26 PM Re: Things I've seen to cause accuracy issues..... [Re: Dalee7892]
RiverRider Offline
THF Trophy Hunter

Registered: 11/11/07
Posts: 8053
Loc: Wise Co.
Originally Posted By: Dalee7892
Chad, back in the day to check clearance on rifle barrel use a dollar bill slide between barrel and stock. Is this good today? Just wondering.


That won't work these days, ya gotta use a twenty. Inflation, ya know.
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#7195925 - 06/12/18 02:54 PM Re: Things I've seen to cause accuracy issues..... [Re: RiverRider]
Judd Offline


Registered: 01/22/09
Posts: 11865
Loc: Wylie, TX
Originally Posted By: RiverRider
Originally Posted By: Dalee7892
Chad, back in the day to check clearance on rifle barrel use a dollar bill slide between barrel and stock. Is this good today? Just wondering.


That won't work these days, ya gotta use a twenty. Inflation, ya know.


Actually that was last month...Beretta Corp recently said a $50 is all that is accurate now grin
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#7195986 - 06/12/18 04:30 PM Re: Things I've seen to cause accuracy issues..... [Re: Judd]
Texan Til I Die Offline
Veteran Tracker

Registered: 08/18/09
Posts: 2114
Loc: Central Texas
Originally Posted By: Judd
Originally Posted By: RiverRider
Originally Posted By: Dalee7892
Chad, back in the day to check clearance on rifle barrel use a dollar bill slide between barrel and stock. Is this good today? Just wondering.


That won't work these days, ya gotta use a twenty. Inflation, ya know.


Actually that was last month...Beretta Corp recently said a $50 is all that is accurate now grin
I used the dollar (or twenty or hundred) method for years, but recently I've seen two different rifles where a single thickness wasn't enough clearance. Not sure if the newer bills are thinner or what, but now I've started using two bills when I check for barrel clearance.
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#7195993 - 06/12/18 04:42 PM Re: Things I've seen to cause accuracy issues..... [Re: ChadTRG42]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 3247
Man I thought he was going to say the shooter...


Glad to know itís not me causing the issues!

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#7196005 - 06/12/18 04:55 PM Re: Things I've seen to cause accuracy issues..... [Re: Texan Til I Die]
ImTheReasonDovesMourn Offline
Veteran Tracker

Registered: 08/04/12
Posts: 2103
Loc: Greenville, TX
Originally Posted By: Texan Til I Die
Originally Posted By: Judd
Originally Posted By: RiverRider
Originally Posted By: Dalee7892
Chad, back in the day to check clearance on rifle barrel use a dollar bill slide between barrel and stock. Is this good today? Just wondering.


That won't work these days, ya gotta use a twenty. Inflation, ya know.


Actually that was last month...Beretta Corp recently said a $50 is all that is accurate now grin
I used the dollar (or twenty or hundred) method for years, but recently I've seen two different rifles where a single thickness wasn't enough clearance. Not sure if the newer bills are thinner or what, but now I've started using two bills when I check for barrel clearance.


It depends on the stock too. Some stocks flex so much that you can slide a dollar cleanly to the action, but as soon as you load the bipod, the stock flexes and touches the barrel. I make sure mine are floated by a wide margin now.
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#7196026 - 06/12/18 05:34 PM Re: Things I've seen to cause accuracy issues..... [Re: Texan Til I Die]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 23109
Loc: Texas
Originally Posted By: Texan Til I Die
Originally Posted By: Judd
Originally Posted By: RiverRider
Originally Posted By: Dalee7892
Chad, back in the day to check clearance on rifle barrel use a dollar bill slide between barrel and stock. Is this good today? Just wondering.


That won't work these days, ya gotta use a twenty. Inflation, ya know.


Actually that was last month...Beretta Corp recently said a $50 is all that is accurate now grin
I used the dollar (or twenty or hundred) method for years, but recently I've seen two different rifles where a single thickness wasn't enough clearance. Not sure if the newer bills are thinner or what, but now I've started using two bills when I check for barrel clearance.


Counterfeit bills are not always he same thickness bolt
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#7196193 - 06/12/18 08:08 PM Re: Things I've seen to cause accuracy issues..... [Re: ChadTRG42]
Sneaky Offline
The "Grouch"

Registered: 10/22/12
Posts: 18840
Loc: Winters
I really appreciate these random bits of knowledge. Iíve never heard of a free floated bolt, and Iíve never even thought about it. It makes sense, and now I have something else to consider when troubleshooting accuracy issues.
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#7196215 - 06/12/18 08:23 PM Re: Things I've seen to cause accuracy issues..... [Re: ChadTRG42]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 24856
Loc: Wolfe City, TX
I use two thicknesses of emory cloth tip to recoil lug, in a shoe shine motion, to ensure there is plenty of clearance, on my rifles. If one is good, more is better.

Lately troubles from customer's rifles have been:

Cheap, poor ammo.
Spotless clean barrels.

I have begun a new policy. I will ask "I have a torque wrench, and every bit conceivable, would you like for me to check the torque on all the screws?" I can't recall anyone turning down the offer.

I have memories of action screws being, or coming loose, scope base, windage screws, and scope cap screws being loose. Any one, or a combination of more than one is nothing but trouble, and a waste of ammo.
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#7196229 - 06/12/18 08:32 PM Re: Things I've seen to cause accuracy issues..... [Re: Sneaky]
Cleric Offline
Veteran Tracker

Registered: 03/11/12
Posts: 3247
Originally Posted By: Sneaky
I really appreciate these random bits of knowledge. Iíve never heard of a free floated bolt, and Iíve never even thought about it. It makes sense, and now I have something else to consider when troubleshooting accuracy issues.


+1

I am going to check and see if my bolt hits

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#7196309 - 06/12/18 10:25 PM Re: Things I've seen to cause accuracy issues..... [Re: Cleric]
Scott W Online   content
Outdoorsman

Registered: 03/08/18
Posts: 82
Loc: Cedar Park, TX
Originally Posted By: Cleric
Originally Posted By: Sneaky
I really appreciate these random bits of knowledge. Iíve never heard of a free floated bolt, and Iíve never even thought about it. It makes sense, and now I have something else to consider when troubleshooting accuracy issues.


+1

I am going to check and see if my bolt hits


#metoo

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#7196354 - 06/13/18 03:11 AM Re: Things I've seen to cause accuracy issues..... [Re: ChadTRG42]
pigplinker Offline
Pro Tracker

Registered: 08/07/11
Posts: 1829
Loc: Ben Wheeler,Tx
Good info. I have a Sako that would cut the same hole at 100. It would be on every year with very little if any adjustment to point of aim. Last year I pulled it out to check and it was every where. Now I have other items to check. Never thought about the bolt. Thanks Chad.

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#7197243 - 06/13/18 10:55 PM Re: Things I've seen to cause accuracy issues..... [Re: ChadTRG42]
SapperTitan Offline
Taking Requests

Registered: 11/17/10
Posts: 25149
Loc: Killeen/Ft Hood, TX
I think the biggest key to inaccurate rifles are the user behind them not knowing and using the basic fundamentals of marksmanship
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#7197553 - 06/14/18 11:10 AM Re: Things I've seen to cause accuracy issues..... [Re: SapperTitan]
DallasShootingSupplies Offline


Registered: 05/21/09
Posts: 4181
Awesome info!

I Will add another I see.

Thats using too many or improperly torqued peel washers on muzzle devices.

While back we would chase our tails a couple times a year with weird groups after a cut, crown and thread.

All of those issues went away once the peel washers were removed, reduced in numbers or properly torqued (over torqued ones cause stuff to start misaligning).
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