7/6.5PRC Pressure and Velocity ammo test

[Sandstorm]

Awesome information , time and effort by everyone involved
Thank you Frank and fellows at Hornady

 

[G7BC]

Thank you Frank. Some great info here.

 

[G7BC]

A nice 7-6.5 PRCW set up that's available on here for someone to hit the ground running...

Brand New 7-6.5 PRCW F-Class Rifle Package

Brand new unfired F-class rifle package for sale. Mcmillan Kestros R stock, Kelbly F-class Panda action, 2 identical Alex Wheeler barrels - Bartlein straight 32" - 9-8.75 gain twist - threaded for Erik Cortina V2 tuners - EC V2 tuner included. New Nightforce competition scope with DDR-2 reticle...

forum.accurateshooter.com

 

[SKWERLZ]

Very similar to my 7SAUM
Berger 190 at 2880 and 183smk at 2905 with R26 in 28” with excellent case life.
R565 it another powder I’d recommend.

I’m running around 3.1-3.2 oal.
H4831ssc was amazing for 160ish grain bullets at short action magazine length.

 

[CBTobias]

Im thinkin its going to catch up with you eventually. Ive pushed them hard before as well.
Its just not worth the headache ..at least for me.

No clickers the entire life of the barrel.

 

[Buttstock-TX]

Thank you for working all the way through this Frank. Using the Hornady pressure and velocity data I was able to build, and history match a Quickload dataset for the Berger 180 Hybrid using N-555. The model now matches the data that I am seeing from my new 31" Bartlein 5R barrel using N-555. The QL barrel times seem to identify nodes that match up pretty well with the OBT spreadsheet and are similar to what I see reported as sweet spots.

 

[209jones]

Very worthwhile endeavor, it spells out a lot of interesting items for folks to ponder. Thanks for doing it

 

[Louisb]

So it should go without saying but I will say it anyways. Lot of powder variances, bullet lot variances from lot to lot and not to mention bullet diameters, primers, brass lot etc... all can change the pressure and velocities. Be careful with what you do! Don't forget.... temperature, humidity, pressure, altitude etc... can have an affect as well. This test was run in a lab in controlled conditions.

Not to mention that differences in chamber reamer spec's of what we used for the test/in our guns here and the pressure test barrel vs what you might have in your gun and as well as what your barrel measures for bore and groove dimensions vs what our test barrel was made to can make a difference as well.

Again I have to give a big thanks to Hornady and Joe and Jayden there for supplying the brass, bullets (166 and 190 ATIPS) and running the test! Thanks to Tommy at Sierra for supplying the 183SMK and 197SMK bullets for the test. Thanks to Ken at Capstone for supplying the Berger 180 Hybrids and the N555 powder used in the testing. The guys here at Bartlein for making the barrel and for Scotty here doing the chamber work and pressure port work etc.. in finishing the test barrel.

Max working pressure for the round is 65,000psi.

Twist does not effect pressure.

All pressure and velocity data is for 10 rounds fired for each load.

The p&v barrel measured 32" finish length.
Twist = 1-8.25
5R rifling
Bore size = .2773"
Groove size = .2843"
Headspace = go +.0002"

All of the ammo listed below has N555 powder. All ammo loaded with CCI#200 Primers. All brass was Hornady brass. All primer flash holes where checked for and or deburred.

All bullets where seated .020" off the lands of a brand new chamber. This was not a bullet test for accuracy. So no bullets/ammo had the bullets seated closer to the lands or further off the lands. No load tuning was done in anyway shape or form. In making this statement no bullet clearly out performed one over the other. All bullets shot very good. Noticed I listed the o.a.l. of my loaded rounds and not the base to ogive dimension. Some of my o.a.l. data I left at home. Let me update that information later today.

So for the 180gr class bullets.... I will say as you approach the 57.0gr powder charge... approach it with caution as you are going to be hitting that 65psi limit even possibly before depending on all the variables. There where no flat primer signs, hard extraction etc... At the top I put in bold letters... average pressure that's because that's the average. There are rounds fired with in a group that could be over the number listed for velocity and pressure was even slightly higher... so these numbers are an average. A good example is the 55.0 load for the 190ATIP. The average is 64829 but there where 3 rounds that went just past the 65k limit.

I'm still reviewing numbers and data and with more data to come for H4831sc, RL16 and H1000 powders. So check this post from time to time as I will be making updates as more information comes in and I'll try and keep my original post #1 going as I get more info.

I was having trouble with the layout on the post. So I saved it as a pdf. You have to click on the attachment. I'll clean it up more later.

Later, Frank
Bartlein Barrels

P.S. it should go without saying but I will say this... "Guys keep your comments civil and think before you type!" Everyone involved with getting this testing done did not receive any $ compensation in anyway shape or form. Everyone did this as a request/thought from me and we all did it to help the shooting community using this round and that there is no baseline/data for to go off of. I don't even want to know how much time and set up it took Hornady to run the test and compile the data and the cost involved with that.

Thank You!!! This is absolutely awesome!!!

Lou