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WesternHunter's picture
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Sorry to get off track of the original question here, but I finally dug up some original but very old arsenal .30-03 cartridges that I picked up long ago as an early teen (still not sure why I have these Think ). The case length difference between the .30-03 and .30-06 is that the .30-03 is longer by 0.07 inches

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sdrty

thanks guys..the answers were great...I just got this Howa 270 from my Dad and was just wondering if it is a good gun to use for Moose Hunting..like someone said in a previous post..dont want to shoot nothing that would just wound the animal and have it run away..

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WesternHunter wrote:
Well we can't really agree to disagree on this. There are appropriate demensions and specs layed out for each cartidge, they are well published and available for anyone. I reload for .270 Win regularly and have reloaded for .30-06 in the past, and use factory brass for each. There is a difference in case length per specs for each cartridge. In .270 the case is not to exceed .2.540", for the .30-06 the case is not to exceed 2.494". Just consult a reloading manual on this one that shows both cartidges specs.

ChesterGolf, the .270's you've measured can be trimmed to the same shorter length as the .30-06, but those .30-06 cases can't be as long as the .270 win specs call for and still safely chamber. All the commercial brass in .270 I've measured has been between 2.530 inches to a bit over 2.540 inches and need to be trimmed to spec of 2.530 inches

What we can agree on is that it is safe to neck down a .30-06 case to accept a .277" bullet and safely fire it in a .270 chamber. It's common practice for some folks to do this because the .30-06 brass is shorter according to spec and safe to fire in a .270 Win chamber when necked down.

In addition to bullet weight being different, the brass case length was not the same between the .30-03 and .30-06 either. The .30-03 was longer than .30-06. Just consult a cartridge book or reloading manual.

In fact it is a misconception that the .270 winchester was derived from the .30-06. It was not, and could not have been as the .30-06 is older and shorter, and the .270 is newer and longer. The case for the .270 Win was based on a longer necked down .30-03 brass case. The confusion come from some reloaders necking down and using .30-06 brass in .270 since it's very readily available and no one that I'm aware of has produced .30-03 brass for quite sometime.

You may be right but I get the extra length when I neck down the 30-06 to 270 diameter as well. I am aware that the 30-03 is indeed a longer cartridge but necking it down would result in a longer case than the 270, needing trimming would it not?

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True. All that brass has to go somewhere when it's necked down. The old .30-03 had such a brief life as a cartridge, and since the .30-06 was based on the .30-03 everyone just assumes that the .270 was based on the 06. I have no way of proving that it wasn't, except that I read an old article from a 1930's edition of Sports Afield (found some of these old magazines when an old victorian house was demolished in our neighborhood when I was a kid) that Winchester/Western based their new .270 Win case on the casings from government arsenal .30-03 cartrige. In the end it doesn't really matter, as reloaders have had plenty of success using .30-06 cases to neck down for .270 and it has worked just fine. The .270 Winchester is a great cartridge and my all time favorite cartridge.

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This is actually funny because I was basing my info. on an old article that the 270win was actually the 277-06 wildcat and was so popular that is was developed by Winchester as the 270 winchester. As a reloader, the necking down process using 30-06 brass brings me extremely close(bang on) to the OAL of 270 brass

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I'm home now so want to update. The 30-06 and 270 are the same size. The 280 Rem is longer in the shoulder which prevents it from chambering in the 270. The slightly longer neck comes when you resize 280 cases to 270 or 25-06, them trimming is required. But I think that I did read that the only difference between the 03 and the 06 was bullet weight.

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Although the main difference is bullet shape and weight, Westernhunter is right that the 30-03 is longer than the 30-06 and used much faster burning powders than the 30-06.

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