270WIN Projectile Seating Depth

[pts4u]

Hi All,

I've been reloading my 270 for sometime now with some reasonable results, i currently use mainly use 110g Hornady VMAX BT.

With this particular projectile I have used both cannelure and non-cannelure.

Is it vital to load the cannelure version of this projectile to the ring on the projectile? or is it better i stick to loading close to the lands?

I figured I'd ask the question before going through the whole load data process again.

And one more thing i would like to know - does anyone else have better results with slower powder? (2209 vs 2208)

Cheers,
Jeremy

[bobnob]

Jeremy, unless your rifle is short throated I'd have thought it would be hard to seat a 110g close to the lands. FWIW I like to seat mine out further than cannelure length with most projectiles up to 150g.

With some bullets I find the depth makes little diff and with some others it makes a huge one. But if you're getting good accuracy with what you've got, I would just leave it.

I like 2208 or even 2206H for bullets 90 to 110g in the 270 Win; 2209 for 130 grainers and 2213SC for 140 to 160 grainers. I'd think 2209 should go pretty good with your 110s though.

[pts4u]

possibly close to the lands wasnt the right way to explain it - i have been loading them just over the width of the bullet deep - so just over .277 deep if that makes sense?

ive just bought some 130g Hornady SST's to try... just about to head out this morning and give them a bench test with 2208 and 2209 both and cannelure depth and mag depth(or just over .277 deep) (these things are a lot longer than the 110g's!)

ive also loaded some 110g with 2209 to try (ive only just bought some 2209 last week for the first time) so i will see how they go also.

hopefully i get some nice results - its not too cold this morning and theres almost zero wind!

[bobnob]

Jeremy, I load the 130 SST out further than the cannelure. About 3.25 to 3.3 from memory. I found them very accurate but I eventually switched to the 150g SST because it did better on the bigger pigs.

With the 130 I was using 56.5g of Ar2209 for about 3100fps.

[Old Fart]

is it vital to load the cannelure version of this projectile to the ring on the projectile?

It's not.

Crimping on the cannelure is really intended for auto-loading rifles to keep the bullets seated during sustained recoil. For safety and consistency.

No need for a bolt action. Guys also to it for high recoil big game cartridges, but no need for a .270 IMO.

[kurl]

And one more thing i would like to know - does anyone else have better results with slower powder? (2209 vs 2208)

I'd say 2209 is maybe a bit more popular from what I've read but both are suitable.

[Khan]

Crimping on the cannelure is really intended for auto-loading rifles to keep the bullets seated during sustained recoil. For safety and consistency.

Also for tube magazine. Lever actions etc.

[Old Fart]

Yes, you're right.

Forgot to mention that.

[Swarm]

Is it vital to load the cannelure version of this projectile to the ring on the projectile? or is it better i stick to loading close to the lands?

As a rule of thumb just off the lands is always best.

Some guys do report their rifles like a little jump rather then being so close. Or that crimping bullets increased accuracy (likely due to more consistent neck tension and pressure cause by the crimp I expect).

As a general rule though just off the lands is a pretty safe bet.

[pts4u]

Jeremy, I load the 130 SST out further than the cannelure. About 3.25 to 3.3 from memory. I found them very accurate but I eventually switched to the 150g SST because it did better on the bigger pigs.

With the 130 I was using 56.5g of Ar2209 for about 3100fps.

wow 56.5 of 2209? were there any signs of pressure issues? i tried 52.5 and had terrible results

if you had no pressure issues i might bump it up to 56 and see if that produces a decent result..

what sort of group did you achieve with this load?

thanks for the info!

[south]

Newbie question here...

I looked up the .270 data on the ADI reloading website and see max for 130gr .270 with 2209 is 55.5gr.

I guess when they say "max" they have still allowed a margin of safety. Is the extra 1gr of powder in your 56.5 load really pushing it?

[bobnob]

Sorry for the late reply.

My rifle has a slightly large chamber and might well digest a little more powder than some.

Now while I don't encourage people to load over max, I carefully work my loads up and sometimes do load above manual maximums.

With 2209 and a variety of 130g bullets I actually worked up to 3240fps and I had zero signs of excess pressure, and accuracy was in the sub 30mm range at 100m. Only an idiot would suggest that load was not pushing my luck. But that was load workup and I probably only fired half a dozen at those speeds.

I eventually settled on 56-56.5g of AR2209 which gives about 3080 to 3110fps. This is an accurate load in my rifle.

My rifle has a 24 inch barrel, 22 inch barrels will get a little less speed.

You need to work up gradually and chrony your loads. Otherwise, stick to book maximums or lower.

[squirrelhunter]

I guess when they say "max" they have still allowed a margin of safety. Is the extra 1gr of powder in your 56.5 load really pushing it?

Some info on that for you...

According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the .308 Winchester can handle up to 415.00 MPa (60,191 psi) Pmax piezo pressure. In C.I.P. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers. This means that .308 Winchester chambered arms in C.I.P. regulated countries are currently (2014) proof tested at 519.00 MPa (75,275 psi) PE piezo pressure.[9]

I won't quote any numbers because I can't remember exactly, but I've read from other tests on people intentionally overloading rifles for testing and from brands going closer to 50% too.

I'm not suggesting anyone go above supplied maximums in load data but just confirming there is a significant safety buffer

[south]

Thanks bob & squirrel for the details

[Hugo]

I now use 2209 after some very good advice from here, I have a Weatherby ultra light in .270 win & found it was spraying the bottom of a 44 gal drum at 100 with 2208 & 140gn nosler bt's but floated barrel changed to 53.5 gns of 2209 with 130gn Barnes Tsx & it now shoots inch groups at 200m, with my personal limit not much more,
Enjoy staycool

[headspace]

I've always likes what used to be called H4831 but is now known as 2213sc. I'm changing from 130gn bullets to 14gn in mine and seat Hornady SST's to the cannelure. My load is currently 58.5gn 2213SC half a grain over the ADI max. However it 's probably worth remembering that 2213SC is a very forgiving powder. I'm happy with my accuracy just under 2" at 200m with a breeze blowing.
JD

[Khan]

it now shoots inch groups at 200m

Good result

[Jpje3011]

What is the range of powder for the 130 grain SST?

[tony m]

I'm from western Canada and own .270's.I also use quite a few 130 gr sst.I like to seat these bullets comfortably off the lands .020 or more and all my rifles like a full column of powder and compressed sometimes.I think the secret is really good brass and really good prep..find your own max loads and lock up the lawyers. I wouldn't use the sst on large game..this bullet always separates.Good practice bullet though. Good luck...its all fun

[Harts]

What is the range of powder for the 130 grain SST?

With AR2208 44 - 46 grains

With AR2209 51 - 54.3 grains

There are other powders but those two are most common.

[headspace]

What is the range of powder for the 130 grain SST?

With AR2208 44 - 46 grains

With AR2209 51 - 54.3 grains

There are other powders but those two are most common.

I'd suggest that 2213SC is a more common powder for the 270. It used to be 4831 and is still listed as that in the Hogden manual, but they buy the powder from us anyway. The 270 likes a full case. I have a load of 58.5 grains of 2213sc behind a 140gn SST that works well. But that's with Winchester brass. I tried the same load with some Federal brass which is thicker, and while it was OK using a 130gn bullet it would have been well compressed with the 140gn. I guess you use what ever works in your rifle.
JD

[Harts]

Two popular powders then I maybe should have said.