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+P chambers
- Thread starter tracybartlein
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tracybartlein
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You tell me! My guess is the guy that dreamed it up... it was his brain child so he had to put a name on it.
It also confuses shooters as well. They think they are loading +P ammo but that's not the case. This isn't the same as +P pistol ammo. The +P pistol ammo is loaded to a higher pressure and hence forth higher velocities. That's why they say some pistols shouldn't be shot with +P ammo as they guns are not rated for the pressure/safety issues.
The +P ammo is still being used in a standard spec chamber. They are not modifying the throat at all.
tracybartlein
Active Member
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Not happening! LOL!
Funny I remember not long ago few individuals arguing with me that they didnt lose barrel life 
guess not if you dont shoot them
guess not if you dont shoot themThat is why it was confusing to me and I had to ask. I used to shoot +P 9mm ammo, which is "hot" and made no sense to call this champers +P.
I am not even an amateur when it comes to ballistics (interior) but I think Roy Weatherby did a complete package (case, throat, action) close to 80 years ago.
I also agree with your comparison to engines. You can go really really fast, a couple of times, or you can go normal speeds for a lifetime
comfisherman
Well-Known Member
Wait, someone is cutting a long lead chamber, roasting what little they had left of throat and then trying to warranty said barrel?
@Shawn Carlock of DE is the best person to answer this question directly.
+p in pistols is way different than in rifles (exceptions, 257rob and similar). Pistol +p has increase in case pressure as +p throating has a faux lead that let's you (within reason, say 100% case fill) use a faster powder to achieve the extra speed. It's the Vang comp for rifles.
DE's +P value is going to be an individual perspective thing. Not a good fit for high volume shooters but some possible advantages for long range hunting rigs running very low mileage. I agree it is only fair for a barrel manufacturer to withdraw warranty on mods like this.
The idea is to help ease the long heavy bullets into rotation at higher velocity without excessive stress on the jacket from deep land engraving. Possible velocity gains of +/- 150 fps. It offers performance gains but typically significant loss of accuracy life. It's not possible to easily set the barrel back to clean up the throats if needed, and the lands of the rifle in much of the throat length is quite shallow compared to the conventional height of lands.
The idea is to help ease the long heavy bullets into rotation at higher velocity without excessive stress on the jacket from deep land engraving. Possible velocity gains of +/- 150 fps. It offers performance gains but typically significant loss of accuracy life. It's not possible to easily set the barrel back to clean up the throats if needed, and the lands of the rifle in much of the throat length is quite shallow compared to the conventional height of lands.
I bore scope every barrel prior to me having it chambered, got the gunsmith to cut the "coin" off the back, and returned it to me with the finished barrel. Amazing how some barrels are a Copper mine.Just order 10 Barts at a time...problem solved!!
The point I was trying to make with my limited understand of what they call +P in rifles, it is a misnomer. In pistols, it is higher pressure, in rifles at best it could be called +V
The .277 FURY by Sig, is a true "+P" in my mind. 80k psi or something?
I am glad the OP posted this thread, forced me to learn something new
QuietTexan
Well-Known Member
If you put a load for a +P chamber into a regular rifle, then that round is overpressured, or +P, in said normal rifle....
is that a question or statement..........
We can play with semantics. I got it, I learned something new, thank you!
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