Coldbore??? VS. Warm

[heartshot]

Went shooting today, Cold bore group 2in high and 1in right, at 100 yards. Both guns shot the same, both are .308 savage 10s, with YHM 7.62 QD cans. Results were the same whether we had the cans on or off. After 15 or so shots the groups came down to our aiming point.

WHY is this happening? Does cold bore make that much difference at a 100 yards?

5 shot groups were great with cold bore and warmed up, just the POI was different.

 

[Lowlight]

Re: Coldbore??? VS. Warm

If the rifle needs that many rounds to settle in, I would suspect a barrel with much too much stress in it... something mechanical is simply "not right" having a huge deviation like.

That is not a normal deviation, and I would look at the entire system for a problem, torque values, to include the barrel nut, bedding, etc. Everything is suspect that the point you are at. Either that or you are using two completely different types of ammunition, but if it is settling it, I suspect a stress issue.

2" is not a deviation I would want under any circumstance, I suspect a more serious problem.

 

[heartshot]

Re: Coldbore??? VS. Warm

Lowlight, first thanks for responding.

I want to give a little more info about the rifles. Mine is all factory on a HS stock that I skim bedded. Never had the barrel off.
Scope and rings were all good and tight.

My dads rifle is a older savage 10 with a pacnor 22in barrel and a Mcmillan A4 stock, his scope and rings were also tight.

I find it strange that both our guns do this even though they are very different yet the problem is exactly the same.

We were both shooting our own hand loads. Both 175gr smks. I know my loads are good so its not an ammo issue.
,
Now my dads rifle was cleaned before we went out, I cant remember if I cleaned mine before I put it away because its been 7 or 8 months since I have been out. Would a cleaned barrel take longer to settle in?
BTW this is my dads account, were trying to figure this out together.
Thanks again

 

[Rob01]

Re: Coldbore??? VS. Warm

Like I asked at AR15, clean cold bore or fouled cold bore?

 

[heartshot]

Re: Coldbore??? VS. Warm

My dads rifle did it cleaned cold bore. After 15 or so shots it settled in to his aiming point. He put his gun to the side for a bit and we shot my AR for a bit then he went back to his rifle and it did the exact same thing. So I am going with both, cleaned cold bore and fouled cold bore. It was 50 deg out. Im pretty sure his barrel cooled down in 20 min.

I cant remember if I cleaned my gun or not when I put it away last. But mine did it right out of the gun case, then settled in. Also set to the side for 20 min or so to shoot some AR and it also did the same thing.

 

[RobertB]

Re: Coldbore??? VS. Warm

You need to have the bbl fouled before you can expect cold bore accuracy.

 

[Lowlight]

Re: Coldbore??? VS. Warm

If both are using that YHM Suppressor / Brake Combo then that might be the first place to look. Something wrong with the QD, check for strikes or streaks indicating the bullet is hitting something.

Who ever threaded it may have screwed it up, might be issue there, seems that is the common point of both rifles... something is definitely not right with both.

No rifle should drift that far, and to the side in less than 20 rounds. time to invest in repair, potentially getting rid of that suppressor combination as it could be the root of the problem.

 

[heartshot]

Re: Coldbore??? VS. Warm

I thought about the threads not being concentric but we had our rifles threaded by two different places, would seem odd if that was both our problems but its not impossible.

Neither of us have any strikes.

And we shot with and without the cans with the same results.

 

[Rob01]

Re: Coldbore??? VS. Warm

Check the simplest thing first. Shoot them both fouled and see what happens. If they hit near same POI as after your 15 rounds then you know your rifle just needs 15-20 rounds to foul after being clean. If not then there might be some mechanical problems.

 

[CaptRob]

Re: Coldbore??? VS. Warm

Lowlight mentioned the cans as the common point but I would say the common point is that they are both Savages. Were you shooting both or was your father shooting his and you shooting yours. Also could the difference been weather related (did you have a strong cross wind that subsided)?

 

[TOP PREDATOR]

Re: Coldbore??? VS. Warm

mine is similiar, 1" high, .75" left 100 yards on the fouled cold bore, savage. subsequent rounds are cloverleaf.

don't rule out "cold shooter syndrome"...get a few rounds in with another rifle first then see if the 1st shot of the day is still off.