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264 Win Mag can some one explain why it flattens boat tails?

 
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Old 08-15-2011, 05:06 AM
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264 Win Mag can some one explain why it flattens boat tails?

So I was talking with a guy at work and he was telling be that beacuse of the 264 win mag is considered a "overbore" round that it will flatten the boat tails of all bullets so he only shoots flat base bullets?

I'm sure some one else has heard this or maybe seen it I dont know it was news to me I would like to here more as I have a barrled action sitting in the gun safe and was planning on using 140g VLDs.

Jon
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Old 08-15-2011, 06:05 AM
Edd Edd is offline
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Re: 264 Win Mag can some one explain why it flattens boat tails?

I haven't heard that but I have heard something similar. I heard about a rabbit that,one day a year, hops all around country leaving candy for all the kids.
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Old 08-15-2011, 08:37 AM
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Re: 264 Win Mag can some one explain why it flattens boat tails?

That's a load of crap. I shoot a 6.5-300 win mag, which is a good bit bigger than the .264 win mag, ive chronoed 140VLDs at up to 3555fps and had them go were they are supposed to.
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Old 08-15-2011, 08:50 AM
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Re: 264 Win Mag can some one explain why it flattens boat tails?

I'm no genius, but I can almost bet my rifle that boat tails don't flatten due to pressure. Sounds like he had a bad go of it with BT bullets and has been able to tune flat base easier.

Tank
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Old 08-15-2011, 09:00 AM
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Re: 264 Win Mag can some one explain why it flattens boat tails?

Quote:
Originally Posted by ICANHITHIMMAN View Post
So I was talking with a guy at work and he was telling be that beacuse of the 264 win mag is considered a "overbore" round that it will flatten the boat tails of all bullets so he only shoots flat base bullets?

I'm sure some one else has heard this or maybe seen it I dont know it was news to me I would like to here more as I have a barrled action sitting in the gun safe and was planning on using 140g VLDs.

Jon
no. no.
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Old 08-15-2011, 10:19 AM
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Re: 264 Win Mag can some one explain why it flattens boat tails?

"overbore" doesn't mean high pressure. You can of course load any cartridge to give excessive pressure. That's dumb as doing so will damage the action. At reasonable pressures however an "overbore" cartridge will give reduced barrel throat life. Throat erosion takes place as the temperature of the surface of the metal in the barrel throat approaches the melting point of the barrel steel. That's primarily a a function of the bore diameter (normal) , the pressure (and hence the temperature) of the propellant gas (normal) , and the duration of the propellant flow which will be longer than cartridges with smaller case capacity. . I can't think of any reason a 264 WM should damage boattail bullets, and I've never seen evidence that it does in the bullets I shoot. I'm not saying it can't happen. I'd like to see photos of the recoverd bullets. It might tell if the damage was from pressure, jacket melting, or the result of impact at the target.

Some other "overbore" factory cartridges include the 223 WSSM,, the 7mm Rem Ultra Mag and the 30-378 Weatherby Magnum. There are a number of severely overbore wildcat cartridges. I own two 264 Win Mags. One is a pre-64 "featherweight" Win 70 with a 22" barrel The other is Rem 700 F Class target rifle with a 28" Pac-Nor heavy barrel. They are as different as night and day in their characteristics.

The only thing wrong with overbore cartridges is reduced barrel life. Why own an overbore rifle? It's because they can have superior performance in windy conditions with low drag bullets. Smaller cartridges (or larger bores) are usually superior when wind deflection uncertainty is not the limiting accuracy factor. Personally I don't mind buying barrels occasionally to get high performance. Barrels are not the major expense of shooting a 264 Win Mag or a 223 WSSM or a 30-378 Wby. Ammunition is even if it's handloaded.

Last edited by LouBoyd; 08-15-2011 at 10:40 AM.
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Old 08-15-2011, 10:29 AM
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Re: 264 Win Mag can some one explain why it flattens boat tails?

Quote:
Originally Posted by Edd View Post
I haven't heard that but I have heard something similar. I heard about a rabbit that,one day a year, hops all around country leaving candy for all the kids.
that is awesome. i was thinking the same thing
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