+p chamber by DE

[bowhunter1287]

Unless it is an XM or LA, don't +P. You can't get to the lands with a 6.5PRC in a SA mag as it is.
I am a little biased, but the PRC/SI is a great increase. I love mine.
I have a SA mag bolt face that will be needing a rebarrel fairly soon, and I will be going 26" 6.5PRC/SI when the time comes.
View attachment 628982

Lance do you think there is any room in the prc/si case to +p to see a gain on top of si?
I would think then it would basically make the prc/si about the same level as the 6.5 max

 

[bowhunter1287]

Well I got a quick response from UM and on the 6.5 prc it only gains 50-75fps so don't think it's worth the try or squeeze for that one.

 

[Shane Lindsey]

More oomph=more cartridge

 

[lancetkenyon]

Lance do you think there is any room in the prc/si case to +p to see a gain on top of si?
I would think then it would basically make the prc/si about the same level as the 6.5 max

If you have the mag length to seat the bullets out a bit more, maybe.
Here is the CBTO/COAL for six bullets in the 6.5PRC and PRC/SI chamber. These were just fire forming loads, but seated to the lands. SI is about .002-.003" more FB than SAAMI PRC.
With several bullets and powders in the PRC/SI, I got up to running them compressed at the top end. So "maybe" depends on powder and bullet choice. I highly doubt 10% more charge weight would be available, however.

 

[lancetkenyon]

Well I got a quick response from UM and on the 6.5 prc it only gains 50-75fps so don't think it's worth the try or squeeze for that one.

SI will gain you 70-170+fps depending on bullet/powder choice.

 

[bowhunter1287]

Thanks lance that is a lot of info I will just stick with going prc/si.

 

[lancetkenyon]

If you need the full spectrum of the testing info...

New "Test" rifle REVEALED: 6.5 PRC SI (Sherman Imp)

I am building a new rifle to test a new case design. I will preface it by saying this is not my design. But I was asked to be the beta tester for it. I cannot say much about it yet but will be in the future once testing begins. I am currently waiting on the reamer to be completed, so my...

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