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.270 factory ammunition
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
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English Mike
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Location: Whitehaven, Cumbria, UK

PostPosted: Wed Feb 12, 2020 10:17 am    Post subject: Re: .270 factory ammunition Reply with quote

slimjim wrote:
yep, your freebore/leade looks to be longer than mine. I also found the 7-28 insert worked better on the .277 bullets and would give a more consistent measurement to the ogive.

Yet we're both below SAAMI spec. Very Happy
Not sure I have the &-28 insert - have to look through the stuff I've never used.
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slimjim
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PostPosted: Wed Feb 12, 2020 6:59 pm    Post subject: Re: .270 factory ammunition Reply with quote

bullet designs today are much different than they were when SAAMI approved the 270 Win. They may be even more variation in the .300 Win Mag or .30-06 rifles being produced today. Then you get mistakes being made in the initial SAAMI approved spec even in modern times like with the 6.8mm SPC and 224 Valkyrie.

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PaulS
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PostPosted: Wed Feb 12, 2020 11:44 pm    Post subject: Re: .270 factory ammunition Reply with quote

I don't think I have ever seen SAAMI specs for bullets. The bullets have to be seated so they fit the magazine and / or the chamber so there is no specification for the bullets. There isn't even a "standard" shape or configuration. Spitzers, spire point, soft point, pointed, round nose, flat nose and hollow points are all different profiles and then you have the low drag, very low drag, and extreme range bullets each with different noses on them.

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Paul
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Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
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Always check data against manuals
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slimjim
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PostPosted: Thu Feb 13, 2020 2:20 am    Post subject: Re: .270 factory ammunition Reply with quote

When a chamber is designed and submitted to SAAMI for certification, it is not uncommon for the freebore in that chamber to be designed with a specific bullet in mind loaded at a specific COAL. One of the latest examples is the 224 Valkyrie which is designed for the Sierra 90 grain SMK. Lighter, non-VLD bullets have to be loaded at much shorter than mag-length COALs to stay out of the lands. The 22 Nosler is designed for these lighter, non-VLD bullets and has a different freebore because of it. Bullet designs have changed in the last 100 years. Try loading today's bullets in a 300 Win Mag and they are far, far from the lands. Manufacturers adjust their freebore away from SAAMI to accommodate. Or in the case of Barnes, they make two different TTSX bullets, one for the .308 Win and another for the .300 Win Mag because of the freebore differences which were optimized for the bullet selection at the time those calibers were designed.

_________________
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