Which barrel profile would act stiffer?

[darkangel_r2]

Hello,

I'm going to be making a semi custom hunting rifle in 6.5 creedmoor or 7mm08 and I am curious which barrel profile you believe would be more accurate on average and produce the lowest POI shift between loads. Barrel length will be 24".

I'm going to use a criterion barrel savage prefit. Link to the profile diagrams:

Prefit Savage Barrels by Criterion Barrels | Northland Shooters Supply

Northland Shooters Supply offers hand lapped match grade prefit Savage barrels by Criterion Barrels Inc. that are finished and fully chambered.

northlandshooterssupply.com

I'm okay with the weight of all 3 of these barrels so I'm more curious as to what order you would rank them. Most accurate, middle, least. If you think there is a tie or so close you wouldnt notice a difference select the two best and write the order in your post.

edit:
Example my 12lrp 6.5 creed had almost no shift in POI for its different loads testing during load development because its a fluted strait taper. But my friends sporter profile barrel could move 1 1/2" between loads.

So I guess the real question is which do you think would act stiffer a 24" light palma or 24" light varmint, because obviously a standard palma would be better than light palma.

SUPER EDIT:
BARREL COMPARISON TOOL ATTACHED TO OP. ADDED DIFFERENT LENGTH STIFFNESS COMPARISON FUNCTION.

 

[INTJ]

The more steel in the barrel the better. Weight is a good indicator.

 

[Rob01]

It’s a hunting rifle so you won’t be putting enough rounds through them to see any POI shift. Not unless you are a real bad hunter lol

All can be accurate. No way to say one would be more than the other just by contour.

 

[darkangel_r2]

It’s a hunting rifle so you won’t be putting enough rounds through them to see any POI shift. Not unless you are a real bad hunter lol

All can be accurate. No way to say one would be more than the other just by contour.

As stated in the OP I'm asking for the lowest POI shift between loads not inside of a string with the same load being shot.

For instance my 12lrp 6.5 creed had almost no shift in POI for its different loads testing durring load develeopment. But my friends Sporter profile barrel could move 1 1/2" between loads.

So I guess the real question is which do you think would act stiffer a 24" light palma or 24" light varmint.

 

[darkangel_r2]

The more steel in the barrel the better. Weight is a good indicator.

I updated the OP to be more clear.

 

[Rob01]

As stated in the OP I'm asking for the lowest POI shift between loads not inside of a string with the same load being shot.

For instance my 12lrp 6.5 creed had almost no shift in POI for its different loads testing durring load develeopment. But my friends Sporter profile barrel could move 1 1/2" between loads.

So I guess the real question is which do you think would act stiffer a 24" light palma or 24" light varmint.

The contour of the light varmint is heavier for the majority of length so that would be my guess as to least shift.

 

[Walt Krafft]

I think you are looking for a problem where none exists.

 

[darkangel_r2]

The contour of the light varmint is heavier for the majority of length so that would be my guess as to least shift.

The light palma has more metal at the muzzle and its neck section is chubbier than the light varmint. So the first 4.5" or so of the light palma will be thicker than the light varmint making it less likely to flex there.

 

[darkangel_r2]

I think you are looking for a problem where none exists.

Do you believe these barrels will exhibit the same POI shift between load during load dev? If one is better or worse I want to know.

 

[Rob01]

The light palma has more metal at the muzzle and its neck section is chubbier than the light varmint. So the first 4.5" or so of the light palma will be thicker than the light varmint making it less likely to flex there.

Well if you know the answers then why ask the question?

If it were me I would get the light varmint but your money.

 

[Walt Krafft]

Different loads will have different points of impact no matter what profile the barrel is.

 

[INTJ]

I updated the OP to be more clear.

My answer is still the same. The more steel in the barrel, the less dispersion. That said, there is no guarantee that a barrel will not have significant POI shift with different loads.

While the muzzle of a heavier barrel moves less, a well tuned load has the least dispersion. So if a second load creates similar harmonics as the first, the POI shift will be minimal. If the harmonics of the second load are different, there will be more dispersion.

And then of course there is the ever vexing differences in individual barrels. I have seen rifles that are identical as possible like different loads.

With all that in mind, get the heaviest barrel you can stand. Most BR target barrels have a straight taper, and that straight taper probably helps barrel stiffness.

 

[darkangel_r2]

Well if you know the answers then why ask the question?

If it were me I would get the light varmint but your money.

I'm not sure if more stiffness at the receiver end and more mass at the muzzle is better than the LV. That's why I am asking.

 

[jelenko]

For a hunting rifle, I think you're well into the over thinking territory.

Given it's a hunting rifle, what is the scenario where you take more than two shots?

 

[darkangel_r2]

Different loads will have different points of impact no matter what profile the barrel is.

That is not true. 30 shots 10 different charge levels most loads had a left or right POI.

 

[INTJ]

I'm not sure if more stiffness at the receiver end and more mass at the muzzle is better than the LV. That's why I am asking.

The truth is that the characteristics of the individual barrel will likely overshadow any differences among those profiles.

 

[darkangel_r2]

For a hunting rifle, I think you're well into the over thinking territory.

Given it's a hunting rifle, what is the scenario where you take more than two shots?

If you read the edit in the OP I'm not talking about bullets with the same load walking around in the same string. I'm asking about which profile would produce the lowest POI shift between different loads. Which would act stiffer and make different loads group closer together.

 

[Rob01]

If you are doing load work with lighter barrels you would need to give them more time between tests to cool down to help any possible POI shift due to heat.

 

[darkangel_r2]

If you are doing load work with lighter barrels you would need to give them more time between tests to cool down to help any possible POI shift due to heat.

Yep thats what I did with my friends hunting rifle. That was a long time on the bench lol.

 

[INTJ]

That is not true. 30 shots 10 different charge levels most loads had a left or right POI.

Ten different charge levels aren't hugely different loads. If you find a node wide enough and the charge increment small enough, you can get what show. I have had a few different customer rifles shoot over a couple grain powder charge increment to the same POI.

Not every tune will give you that.