Powder Choice, 270 Win with 100gn Projectile

Ok so I picked up a couple of hundred 100gn bullets for the 270Win, because they were a good price, because I thought I could practice on culling turkeys my mate wants rid of - at a little distance, and of course to obliterate the occasional magpie or harvest a rabbit or hare. Yes, I understand they don't have the BC to support real long-distance shooting, but I reckon 300m with prior ascertained (ethical) accuracy should be feasible.

Anyway, I'm looking at powder choice, (assuming I can choose), on two main criteria, accuracy and avoiding undue wear on the barrel. I'm not planning to bang out 5 shot consecutive strings and am prepared to let the barrel cool after say 3 shots.

So here's a list of powders I've culled data for from manufacturers online info. I'm interested particularly in the benefits of a lower volume powder (more shots per cannister), vs higher volume (assuming case fill is an accuracy/consistency issue). Also, the lower volume powders, while dropping a bit on velocity, also drop on pressures. I'm assuming this equals less heat and often less pressure, therefore less wear on the bore and throat. Correct?

I have a 24" barrel in good nick, suppressed. WIN LR Primers are listed for each load. Only H4350 / AR2209 reaches close enough to 60gn to warrant considering a magnum primer.

So, of the following list what would be your top three choices and why?

cheers.

Hogdon

CF223 - 53.0gn/3356fps/54900PSI - 55.8gn/3514/62900PSI

H335 - 41.0gn/3058fps/45300CUP - 43.5gn/3185fps/50200CUP

H380 - 50.0gn/3160fps/46200CUP - 53.7gn/3274fps/50300CUP

H4350 - 56.0gn/3258fps/44000CUP - 59.4gn/3401fps/50200CUP

IMR3031 - 45.5gn/3139fps/44700CUP - 49.0gn/3339fps/50400CUP

IMR4895 - 48.0gn/3180fps/47900CUP - 52.2gn/3367fps/51500CUP

IMR4064 - 48.0gn/3116fps/40800CUP - 52.7gn/3380fps/50100CUP

WIN760 - 53.0gn/3262fps/4600CUP - 56.0gn/3383fps/50700CUP

ADI

AR2206H - 47.0gn/3298fps/4700CUP - 50.0gn/3401fps/50200CUP

AR2208 - 48.0gn/3232fps/47000CUP - 52.0gn/3397fps/50200CUP

AR2209 - 56.0gn/3258fps/44000CUP - 59.4gn/3401fps/50200CUP

2217

760 because I've used it for the 110s and know it works great.plus it's usually available and great flow through a measure

Quote:

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Originally Posted by 7mmsaum

2217

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Got published data?

Attachment 235729

Not a lot of experience with most powders but these two cover a wide range. I use AR2208 for 30.06 and 223. Very versatile stuff.

AR2206H - 47.0gn/3298fps/4700CUP - 50.0gn/3401fps/50200CUP

AR2208 - 48.0gn/3232fps/47000CUP - 52.0gn/3397fps/50200CUP

Greetings @Jhon,
If you are wanting to keep the wear and tear on the barrel down then reducing the powder charge is key. Personally I would keep away from the slow and ball powders. For flexibility it would be hard to go past AR2206H/ H4895. Until recently Hodgdon published a reduced load of 39 grains of H4895 with the 100 grain in the .270 for 2,677 fps at 30,000 PSI. They still publish their 60% rule that allows light loads with H4895 down just not the actual loads. This does not apply to IMR4895.
Regards Grandpamac.

Go hard or go home

Greetings again,
The point I forgot to make is that your confidence range of loads is much wider with AR2206H than other powders. My experience with AR2206H in the .308 and .303 is that loads much under 80% of max tend to burn a bit dirty so somewhere in the 39 to 50 grain range you should find what you want.
GPM.

2209 aka h4350 just goes so well in 270

Its quite a big case so go for the best case fill. Out of your group of powders 2209 / 4350 is the pick. Crank them fast and BC wont matter, 400mtr easy

2213sc. When are you buying your new barrel. Stoking enough powder to zing that weight pill you are into lava hot country.

https://bulletin.accurateshooter.com...s-key-factors/

Quote:

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Originally Posted by TeRei

2213sc. When are you buying your new barrel. Stoking enough powder to zing that weight pill you are into lava hot country.

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Not really as can't fit in more than 60grains of 2213sc and that's still a maximum for the 130grn pill depending on which manual you look in.

x2 Grandpamac

I have a youth load made for reduced recoil. 110Gr Sierra prohunter bullets and 39gr of AR2206H for 2550fps. Bullet has worked great on fallow, goats and pigs so far. Very accurate and pleasant to shoot. shots are up to 150m.

Quote:

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Originally Posted by MtnMan

x2 Grandpamac

I have a youth load made for reduced recoil. 110Gr Sierra prohunter bullets and 39gr of AR2206H for 2550fps. Bullet has worked great on fallow, goats and pigs so far. Very accurate and pleasant to shoot. shots are up to 150m.

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Barrel twist?

Just a standard Winchester featherweight M70. 1:10 twist I think