6CM Accuracy Concerns - Am I expecting too much?

[J_Jacobson]

I have a Howa that has been rebarreled to 6CM with a 120fb using a 1:7.5" DD IBI Medium Hunter barrel by a very reputable gunsmith.
Whatever I do i cannot get a 10 shot group under 1.25MOA. Am I expecting too much?
I have swapped scopes, mounts, and chassis. Everything has always been degreased and paint penned.

Actions screws are tight on both the XRS and Bravo ive used.

Ive tried 107smk, 112MB, 108eldm, 80vt, and 87vmax. ADG Brass. Ar2209, ar2213sc, and AR2217. Fed GMM LRPs and Rem 9 1/2. Ive even fed it some factories.
All groups float between 1.2-1.5MOA groups for 8 to 10 shots. Sometimes i can see it wants to group, putting 5 or 6 of the shots into 0.3" then the rest of the group is scattered around it.

Am I being pedantic and this is good enough or have I forgotten something obvious?

 

[Deere_Man]

Is this a hunting rifle? If so, what does the first three shots look like when the barrel is cold?

1.5” for ten shots is just fine for a hunting rifle. She might settle down once you have a shot it some more.

How did you find this barrel manufacturer? I have never heard of them. I’m usually looking at Hart, Douglas, Krieger, Bartlein, Brux, Lilja, or Shilen.

 

[ResearchinStuff]

That's good enough to do the job, but not great. Try some h4350.

 

[Libtard McSocalist]

I’m going to have to reccomend some 109 and especially 105 hybrids. I start around .030 jump and go in/out from there. Powder wise I would look at h4350 and rl16. When in doubt yellow box and 4350 rarely disappoint in 6mms

 

[sierracharlie338]

Yep as stated h4350 is the way. Any of the Bergers or eldms should be printing respectable groups

 

[robtattoo]

A

Thread 'Your Groups Are Too Small'

Dec 15, 2022

Thought this was a great discussion about group sizes. Especially chasing a zero. Recommend anyone take a listen.

• ARK_Ginger
• Replies: 464
• Forum: Long Range Hunting

• 

 

[mtnbound]

I have a Howa that has been rebarreled to 6CM with a 120fb using a 1:7.5" DD IBI Medium Hunter barrel by a very reputable gunsmith.
Whatever I do i cannot get a 10 shot group under 1.25MOA. Am I expecting too much?
I have swapped scopes, mounts, and chassis. Everything has always been degreased and paint penned.

Actions screws are tight on both the XRS and Bravo ive used.

Ive tried 107smk, 112MB, 108eldm, 80vt, and 87vmax. ADG Brass. Ar2209, ar2213sc, and AR2217. Fed GMM LRPs and Rem 9 1/2. Ive even fed it some factories.
All groups float between 1.2-1.5MOA groups for 8 to 10 shots. Sometimes i can see it wants to group, putting 5 or 6 of the shots into 0.3" then the rest of the group is scattered around it.

Am I being pedantic and this is good enough or have I forgotten something obvious?

Do you have any other platforms that you shoot and get under 1.25”moa with 10rds? How many rounds down the barrel at this point? Try H4350 and N555 powders with the heavier bullets.

 

[mxgsfmdpx]

Consistent 10 shot 1.25 MOA groups?

Go hunt.

You aren’t shooting the difference between a 0.75 MOA gun and a 1.25 MOA gun on animals in the mountains. Unfamiliar terrain, cold shooter, pressure/adrenaline, and being able to call the wind are the great equalizer here.

Pretty sure if someone who has access to one of those 6 degree of freedom fancy probability calculators the difference will be next to nothing in realistic simulated conditions.

All I can attest is, when shooting “1 MOA all day guns” versus “1.5 MOA all day guns” in the mountains 3-5 days per week nearly every week of the year, there is no measurable difference in hit rates on vital sized targets.

 

[wind gypsy]

For all the people saying h4350, ar2209 is the same thing.

 

[SDHNTR]

“DD IBI Medium Hunter barrel”

What is this? Is that a brand? Never heard of them. Prefit? Cut chamber? Button or cut rifling? Inexpensive? What does your smith say about your accuracy expectations?

IMO, you are probably getting all you can expect, especially on a factory action and with an “off brand” or inexpensive (I honestly don’t know) barrel. And your results are definitely good enough. Go hunt.

If you demand more precision you’re probably going to need to spend more money.

 

[TaperPin]

“DD IBI Medium Hunter barrel”

What is this? Is that a brand?

It’s a Canadian company.

Shop - International Barrels

internationalbarrels.com

 

[bonepoint]

Most will say H4350, but my 6 CM definitely preferred RL16 over H4350.

 

[SDHNTR]

It’s a Canadian company.

Shop - International Barrels

internationalbarrels.com

Interesting. Definitely not inexpensive. Button rifled, I see.

OP, are you Canadian? Curious why you chose this barrel manufacturer? Are the better known standards like Bartlein, Brux, Kreiger, etc hard to get in Canada?