98 mauser 300wm accuracy

[Pa Grizz]

I built a 300 wm from a 98 mauser action with a DOUGLAS SUPREME barrel.It would shoot 200 gr Sierra boat tails under half inch group all day.I bought some Hornady's mag loads to see how much faster they were and how accurate.First 3 touched.After that they went all over.The gun has never had good accuracy since.I have checked head space.I have poured the chamber and all measurements are right on. Does anyone have any idea's on what I need to check next

 

[CaptnC]

Scope mounting...did you "bed" the mount?

Mine came loose a week before my Aoudad hunt..VZ-24 BRNO trued 26" Varmint barrel from Douglas as well.

I plan to bed mine and might just go ahead and epoxy it to the receiver.

 

[Pa Grizz]

Scope mounting...did you "bed" the mount?

Mine came loose a week before my Aoudad hunt..VZ-24 BRNO trued 26" Varmint barrel from Douglas as well.

I plan to bed mine and might just go ahead and epoxy it to the receiver.

First thing I did was make sure everything had a good fit and was tight

 

[CaptnC]

I forget the caliber right now, but I know a guy who shoot bench rest competition. He told me he has one rifle that shoots bug hole for roughly 100 shots then goes all over the place. I personally have never seen a rifle like that, but have you did a deep copper cleaning and then shoot it?

 

[Pa Grizz]

I forget the caliber right now, but I know a guy who shoot bench rest competition. He told me he has one rifle that shoots bug hole for roughly 100 shots then goes all over the place. I personally have never seen a rifle like that, but have you did a deep copper cleaning and then shoot it?

Yes .I used 7.62

 

[shortgrass]

Swap scopes for a known good one.

 

[Pa Grizz]

Swap scopes for a known good one.

I did.From a 3.5 x10 Leupold to a 4.5x14 Burris to a 6.5x 20 Leupold.Still can get the accuracy back

 

[Riflehunter1776]

did you nick the crown after cleaning it?

 

[Pa Grizz]

did you nick the crown after cleaning it?

I recrowned it just to make sure.Did not change anything I cannot figure it out. Went from dime size groups to if I am lucky 2 inch ones .Never had a case stick.Never had any bolt problems

 

[Riflehunter1776]

First thing I did was make sure everything had a good fit and was tight

how bout the action screws? torqued correctly? what about the barrel channel? I have seen stocks warp and start to put pressure on the barrel

 

[Pa Grizz]

how bout the action screws? torqued correctly? what about the barrel channel? I have seen stocks warp and start to put pressure on the barrel

 

[Pa Grizz]

Checked and double checked

 

[Rum River]

Do you have a borescope available to verify the condition of the bore?

 

[Pa Grizz]

Do you have a borescope available to verify the condition of the bore?

Yes.Bore in good shape