270 Winchester Ackley Improved

budlight

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I will have my 270 ai build back next week. Going start load work with rel 22 and 7828 and 130 and 140 pills
I've found R-22 and Imr 7828 worked the best with large rifle mag primers like CCI 250

130's don't have a good BC but they go pretty good with R-22 62 gr. 140 SPBT's 60 gr of R-22 and 150's with 58 gr The 7828 again with the mag primer uses about 1.5 grains more for each respective pill weight.

Of course start a couple of grains less on the powder and work up to these amounts.
 
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elkaholic

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I will have my 270 ai build back next week. Going start load work with rel 22 and 7828 and 130 and 140 pills
The .270 Sherman will give you a 5% capacity increase over the A.I. with the same parent case. It is nearly identical in capacity with the WSM. I don't have a .270 yet, but my 6.5 gets 3150-3200 with a 140 berger and a 26" barrel.....Rich
 

darndt

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I may have to go that route with my next one. I have another action sitting around. I was thinking a 6.5-06 ai but i am up to try anything. So the sherman would be similar to the gibbs correct?
 

elkaholic

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I may have to go that route with my next one. I have another action sitting around. I was thinking a 6.5-06 ai but i am up to try anything. So the sherman would be similar to the gibbs correct?
It is nearly identical to the Gibbs in capacity but is a far better design. Longer neck, less body taper and sharper shoulder....Rich
 

budlight

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The .270 Sherman will give you a 5% capacity increase over the A.I. with the same parent case. It is nearly identical in capacity with the WSM. I don't have a .270 yet, but my 6.5 gets 3150-3200 with a 140 berger and a 26" barrel.....Rich
Do you have a spec drawing of the sherman .277? With a tall drop tube I'm able to put in 65 grains of H1000 in my 270 winchester brass ai case. That is level to top. I have not done the grains of water. Using the standard new Win 270 case and H-1000 powder @60 grains is the most.

I shoot allot of rounds so I buy cheaper bullets for 98% of my shooting. The Sierra game king 150's (Spitzer Boat Tails) are a good choice

I also do the messy home moly coating.

Sierra Bullets - The Bulletsmiths
 

elkaholic

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hauser, id.
Do you have a spec drawing of the sherman .277? With a tall drop tube I'm able to put in 65 grains of H1000 in my 270 winchester brass ai case. That is level to top. I have not done the grains of water. Using the standard new Win 270 case and H-1000 powder @60 grains is the most.

I shoot allot of rounds so I buy cheaper bullets for 98% of my shooting. The Sierra game king 150's (Spitzer Boat Tails) are a good choice

I also do the messy home moly coating.

Sierra Bullets - The Bulletsmiths
My 6.5 Sherman holds 75 grains of H20 to the top, so the .270 would be slightly more. I do have a spec sheet for my 6.5 and my 300. The .270 would be the same except for the neck. Neck length on the .270 would be around .304".
 

darndt

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where did you purchase the reamer? You have my interest up. I would like to go the 6.5 sherman route on my next build this spring. Should only have to neck size too, correct?
 

elkaholic

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where did you purchase the reamer? You have my interest up. I would like to go the 6.5 sherman route on my next build this spring. Should only have to neck size too, correct?
I had Dave Kiff build it. I have a hydro form die that I use to form the cases for both my 6.5 and 300 but I have also fire formed them. If I use .270 cases for the 6.5, I simply neck to 6.5 and leave a false shoulder to headspace. I use 11 grains of red dot, fill the rest with corn meal, and a little cotton to hold it together.......Rich
 
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