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280 SHERMAN MAX vs .280 A.I.

 
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  #1  
Old 06-13-2011, 08:11 PM
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280 SHERMAN MAX vs .280 A.I.

There have been a few questions on a couple of other threads concerning case capacities of these cartridges so I did a very accurate test today. I took a new .280 A.I. Nosler case and put in an old primer and then weighed the case. I then filled it to the brim with H20 and re-weighed and subracted the difference. The capacity in H20 was 73.4 grains. I then fireformed the same case in my .300 Sherman chamber and necked it back down to .280 and repeated the H20 process. The capacity was exactly 76 grains. This gives a 3.6 grain increase over the A.I. for a gain of 4.7%...........Rich
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Old 06-13-2011, 08:17 PM
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Re: 280 SHERMAN MAX vs .280 A.I.

Rich, I don't know what a Sherman Max is yet but I think you added wrong or put the wrong numbers down. It should be a 2.6gr difference by your numbers. What is the base cartridge for the Sherman Max?
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Old 06-13-2011, 08:48 PM
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Re: 280 SHERMAN MAX vs .280 A.I.

Quote:
Originally Posted by elkaholic View Post
There have been a few questions on a couple of other threads concerning case capacities of these cartridges so I did a very accurate test today. I took a new .280 A.I. Nosler case and put in an old primer and then weighed the case. I then filled it to the brim with H20 and re-weighed and subracted the difference. The capacity in H20 was 73.4 grains. I then fireformed the same case in my .300 Sherman chamber and necked it back down to .280 and repeated the H20 process. The capacity was exactly 76 grains. This gives a 3.6 grain increase over the A.I. for a gain of 4.7%...........Rich
Hello Rich.
I can't find the reamer dimensions on the Sherman so the question is , Can you fire form a 280 rem
to the Sherman? Just like the 280 AI.

J E CUSTOM
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Old 06-13-2011, 09:26 PM
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Re: 280 SHERMAN MAX vs .280 A.I.

Quote:
Originally Posted by J E Custom View Post
Hello Rich.
I can't find the reamer dimensions on the Sherman so the question is , Can you fire form a 280 rem
to the Sherman? Just like the 280 AI.

J E CUSTOM
Hi Jerry. Good to hear from you. You can but not as simple as chambering the .280 and firing as in the A.I. If I were going to use the std. .280 case, I would first neck up to .308 and then back down to .284 leaving a false shoulder to headspace against. My case measures 2.150" body length to shoulder and my .300 is 2.223 to the neck junction so a .280 would be about 2.237" give or take a couple thou to the neck. Diameter at the body/shoulder junction is .460". You can use my reamer....Rich
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Old 06-13-2011, 09:40 PM
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Re: 280 SHERMAN MAX vs .280 A.I.

What kinda numbers do you get with bullets like the 168 or 180 Berger, my dad is putting together a 6.5 Sherman soon and I'm really looking forward to seeing what it will do, if it performs like it looks the speed goats better stay waaaayyy out of range
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Old 06-13-2011, 10:25 PM
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Re: 280 SHERMAN MAX vs .280 A.I.

Hi Bign'.......I had no idea he was your dad! Ya, that 6.5 will definitely outrun a speedgoat I don't have a .280 put together yet but a guy in Lewistown is building one this summer so should have some real data before too long. My guess is that 3150' should be possible with a 168 in a 26" tube. The 6.5 will exceed 3200' with a 26' and I get 3100 with 190 SXR's out of my 300 Sherman with a 28". You'd better build a .280 to stay ahead of your dad........Rich
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  #7  
Old 03-03-2014, 05:06 PM
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Re: 280 SHERMAN MAX vs .280 A.I.

Old thread but my the .280 Sherman has my interest. Has anyone got any actual data from the 168s or 180s?
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