270 Winchester Magnum???

hawk-i said:
Just curios if 280 AI would have been a better chambering for this rifle than 270 win?? :)
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Decisions decisions, there is a multitude of cartridges to choose from, and the 280 AI crossed my mind many times. I owned a 280 AI in a model 52 Cooper and loved it, however sold it and moved on. After the 270 Win. build I went on to the next build. The 280 AI was a candidate, however went for the 300 H&H, which should be arriving in the mail soon, I hope. It's very possible my next choice will be the AI, especially when Nosler and Peterson manufacture it's cases.............stay-tuned.;)
 
Is there anywhere in Canada to get loads pressure tested? It would be interesting and informative to know what pressures these loads are actually producing... I suspect they're quite high.
 
Buckmastr said:
QL estimates that 3400 is obtainable at a predicted pressure of 65k given the 27" barrel length. Of course this is an estimate. Originally it estimated that it would take 63.5 gr of powder to get there whereas your seeing that same velocity at 61.5 gr. The difference could be in the powder, the chamber volume or whatever. This isn't an exact science but learning about your gun and load as you go is important.
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try adjusting the start pressure up from 3626psi, which simulates 1/4" of freebore
 
UPDATE
Hence the initial post, I attended the gun range to locate that sweet-spot for accuracy. The powder load was reduced from 61.5 gr. of Alliant #26 to 60.5 and 60.0 gr., and jump was reduced to half (.015 to 008").
Results were rewarding with the 60.0 gr. of Alliant #26 with sub-1/2 moa, accompanied with average velocities of 3,300 fps. The only challenge/frustration was from the Hornady brass. Conclusion on the brass is that it was most inconsistent in weight (11.5 grains from light to heavy) which resulted in larger groups.
This journey was immensely fun, however not over.........step-aside Mr. Hornady, Mr. Peterson will be taking your place.
https://imgur.com/a/8nVsNv5
 
track said:
UPDATE
Hence the initial post, I attended the gun range to locate that sweet-spot for accuracy. The powder load was reduced from 61.5 gr. of Alliant #26 to 60.5 and 60.0 gr., and jump was reduced to half (.015 to 008").
Results were rewarding with the 60.0 gr. of Alliant #26 with sub-1/2 moa, accompanied with average velocities of 3,300 fps. The only challenge/frustration was from the Hornady brass. Conclusion on the brass is that it was most inconsistent in weight (11.5 grains from light to heavy) which resulted in larger groups.
This journey was immensely fun, however not over.........step-aside Mr. Hornady, Mr. Peterson will be taking your place.
https://imgur.com/a/8nVsNv5
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rekon that would be the case with most hornady???

i just acquired some hornady 7mm brass an thought that was a good deal.... buuuttt????
 
Hornady brass isn't premium brass by any jump of the imagination.

Back when I thought it was important I took 165gr bullets up to 200 fps faster than they were supposed to in a 300 win. No crazy "pressure" signs and never had an incident. But never got any real benefit from it either. Eventually I decided that feeding the rifle what probably amounted to proof loads for no good reason was stupid and backed off. But it was fun while it lasted.
 
jethunter said:
Hornady brass isn't premium brass by any jump of the imagination.

Back when I thought it was important I took 165gr bullets up to 200 fps faster than they were supposed to in a 300 win. No crazy "pressure" signs and never had an incident. But never got any real benefit from it either. Eventually I decided that feeding the rifle what probably amounted to proof loads for no good reason was stupid and backed off. But it was fun while it lasted.
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"Fun while it lasted". That's what I enjoyed, the journey of experimenting, as a hand loader. For the most part I used Nosler and Norma brass with consistent results, however after researching Peterson Brass (Cases), it's the next best thing to Lapua. Unfortunately there is only one retailer (X-Reload) in Canada who sells this brass, however no 270 Win. in stock. My order has been made with X-Reload and just waiting for the email or call. I'll will probably order other Peterson brass for other cartridges that I shoot as well.
 
track said:
"Fun while it lasted". That's what I enjoyed, the journey of experimenting, as a hand loader. For the most part I used Nosler and Norma brass with consistent results, however after researching Peterson Brass (Cases), it's the next best thing to Lapua. Unfortunately there is only one retailer (X-Reload) in Canada who sells this brass, however no 270 Win. in stock. My order has been made with X-Reload and just waiting for the email or call. I'll will probably order other Peterson brass for other cartridges that I shoot as well.
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Mystic Precision is the best I know for ordering things that aren't available in Canuckle land otherwise.
 
Buckmastr said:
As I side note I had a 1:8 twist 270 Win put together this summer on a model 700. My dream was to shoot the 170 Berger EOL. I thought (QL was consulted) I could get them to 2900 using 7828 and a 26" barrel. I couldn't get there. Although I didn't blow myself up, I may have blown a primer. I didn't see the accuracy I was looking for either after I backed it down to 2800 and change. It now sits there, waiting for my motivation to figure it out.
Looking back the 1:10 is perfect. 150's are plenty. The 270 was figured out long before I came along.
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The 270 Win was designed to shoot 130 grain SP bullets at 3000 fps and worked great. It does fine with the 140 - 150 hunting bullets that came along later and easily pushed them to 2850- 2900 f/s in 22" barreled hunting rifles and even better in 26 " barreled rifles like the Remington 700 CDL. However even the 26" barrel does not do so great with the longer 150 LRAB as the 1:10" barrel gives marginal stability and velocity suffers because of the long jump required due to the throat design. Rather than altering the 270 Win to run these new bullets , including the 170 EOL, I decided to do a modern 270 throated properly, with an 8:5 Twist that fits in a Short Action Win action designed for the WSM, or a modern action such as the Defiance XM (Medium action). This drawing shows single digit SD's with both New and FL Bertram brass running the 170 EOL at 2934 and 2935 f/s with 57.5 grains RL 26 in a 26" barrel.
270%20PHC%20%20170%20EOL_zpssevxpndm.jpg
 
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