Dilemma: 6mm AI vs 6x284 vs 25-06 AI

[Kurt]

6mm creedmore check that out

[SBruce]

Originally Posted by Colestaton

I know barrels are consumables but what do you think the difference in barrel life would be in the 6mmAI and the 6-06?

That might take some research to answer. At some point above 6XC, 243, 6mm remington we cross the threshold of way overbore. Where exactly that happens I don't really know, but it happens. We start burning more and more powder to get smaller and smaller increases in velocity. With the increase in powder goes faster and faster throat erosion.

Either way, which ever cartridge you decide, you'll want 7, 7.5 or 8 twist for the 115s and 8 or 8.5 (maybe 9 twist if your altitude is higher) for the 105-107 bullets. My first AI 6-47Lapua had a 9 and stabilized the 105s just fine, but I am at 4200'.

[c_bass16]

Originally Posted by SBruce

That might take some research to answer. At some point above 6XC, 243, 6mm remington we cross the threshold of way overbore. Where exactly that happens I don't really know, but it happens. We start burning more and more powder to get smaller and smaller increases in velocity. With the increase in powder goes faster and faster throat erosion.

Either way, which ever cartridge you decide, you'll want 7, 7.5 or 8 twist for the 115s and 8 or 8.5 (maybe 9 twist if your altitude is higher) for the 105-107 bullets. My first AI 6-47Lapua had a 9 and stabilized the 105s just fine, but I am at 4200'.

I shoot 105 Amax from my 243WSSM AR with a 1:9 twist at around 1300 elevation but they are going a bit past 3150 fps.
Also shoot 105 Amax out of my dads 6mm Rem with a 1:9.

I know guys CAN shoot them from a 1:10, but I agree the 1:8 is better suited for 105-107 and 7-7.5 is better suited for 115s

[bthomasb1]

yet another cartridge 6mm-06 AI with a 28 inch tube will push a 105 berger hybrid over 3500 barrel life wont be good but it will shoot flat as a tight string

[long450]

No delimma, all will work equally well. I personally prefer heavier bullets for deer size game at 500 yards. Go shoot some steel at 500 and listen to the report off 6mm verses, says a 7mm bullet.

[Outlaw6.0]

I've been a 6mm fan for a long time. I started with the 243 then rechambered to 243ai then to 6mmai then built a 6-284. I still own one of each minus the 243ai.

The 6-284 is going to be the king of the hill (as far as what you've listed), better velocity, no fire forming & WAY better brass (Lapua). That being said, I feel the 6mmai is more efficient & will last longer. A better case design with a longer neck should be a good bit easier on the thoat than the shorter neck of the 284 case.

I built my AI & 284 on different sides of the spectrum. The AI is a lighter weight (#5 contour IIRC) with a laminate thumbhole & 12 twist bbl. Launching 85grainers @ over 3500fps is a lot of fun & somewhat messy

The 6-284 wears a very heavy (don't remember contour, MTU-ish) barrel & McMillan A-5 stock with a 8 twist bbl. 107's at 3400fps is equally impressive. At 15lbs, this isn't a stalking rifle.

If this is going to be a dedicated coyote/deer rig, flip a coin on th 6mm's pick up an 1-8" tube & chamber accordingly, you can't really go wrong with either.

6mm all the way.

t

[Colestaton]

Originally Posted by Outlaw6.0

I've been a 6mm fan for a long time. I started with the 243 then rechambered to 243ai then to 6mmai then built a 6-284. I still own one of each minus the 243ai.

The 6-284 is going to be the king of the hill (as far as what you've listed), better velocity, no fire forming & WAY better brass (Lapua). That being said, I feel the 6mmai is more efficient & will last longer. A better case design with a longer neck should be a good bit easier on the thoat than the shorter neck of the 284 case.

I built my AI & 284 on different sides of the spectrum. The AI is a lighter weight (#5 contour IIRC) with a laminate thumbhole & 12 twist bbl. Launching 85grainers @ over 3500fps is a lot of fun & somewhat messy

The 6-284 wears a very heavy (don't remember contour, MTU-ish) barrel & McMillan A-5 stock with a 8 twist bbl. 107's at 3400fps is equally impressive. At 15lbs, this isn't a stalking rifle.

If this is going to be a dedicated coyote/deer rig, flip a coin on th 6mm's pick up an 1-8" tube & chamber accordingly, you can't really go wrong with either.

6mm all the way.

t

I'm leaning toward the 6mmAI. Don't have much experience with forming much brass but I was looking into the 6mm-06ai. How much work would it be to form brass for this round using 30-06 lapua brass?