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.
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.
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