7-6.5PRCW load data

[Dbov245]

My 100 yard depth test

Harris bipod and a squeeze type bag. Nothing fancy very rudimentary.
The extra hole on the top row 2nd orange dot above the # 2 at 2.431 was the shooter next to me (308 win).

 

[Alex Wheeler]

The Lapua and ADG brass is so tough that it will let you do things you shouldnt. With a good action you will not have pressure signs. But your growing the case head and swelling the chamber. Had a customer get clickers around the 4th firing. No pressure signs. Die was sizing enough. So I had him measure the solid web. It had grown .004 in 4 firings. No ejector marks or bolt lift. Before ADG and Lapua got into the magnums we ran brass that would show ejector marks before we got stupid. Now it will let you get away with it. So just know that because you dont see pressure signs, doesnt mean your not there.

 

[LVLAaron]

It had grown .004 in 4 firings.

woof!

 

[EdHarley]

The Lapua and ADG brass is so tough that it will let you do things you shouldnt. With a good action you will not have pressure signs. But your growing the case head and swelling the chamber. Had a customer get clickers around the 4th firing. No pressure signs. Die was sizing enough. So I had him measure the solid web. It had grown .004 in 4 firings. No ejector marks or bolt lift. Before ADG and Lapua got into the magnums we ran brass that would show ejector marks before we got stupid. Now it will let you get away with it. So just know that because you dont see pressure signs, doesnt mean your not there.

Any idea what load they used?

 

[Alex Wheeler]

It was not this cartridge it was another wildcat built on the same brass. But I wouldnt post that anyhow. It was way over pressure. Point is, this brass will not give you pressure signs like what your used to in a 284 or a saum or wsm with Norma brass.

 

[Rook 6]

It was not this cartridge it was another wildcat built on the same brass. But I wouldnt post that anyhow. It was way over pressure. Point is, this brass will not give you pressure signs like what your used to in a 284 or a saum or wsm with Norma brass.

Looking forward to seeing the results of pressure testing by Hornady with Frank’s barrel.

 

[noahburleson1]

Looking forward to seeing the results of pressure testing by Hornady with Frank’s barrel.

I’m definitely interested in seeing their results as well. I’m curious if they used lapua brass rather than Hornady if their results would be any different or not. Or if pressure is the same between different manufacturers of brass? It will be interesting

 

[EdHarley]

It was not this cartridge it was another wildcat built on the same brass. But I wouldnt post that anyhow. It was way over pressure. Point is, this brass will not give you pressure signs like what your used to in a 284 or a saum or wsm with Norma brass.

Fair enough, I just didn't want to approach that level of pressure is all.

 

[Alex Wheeler]

Around mid 2900s and up is when issues will come up. You can push them over 3k with no signs. But its wont live there. The faster burning powders will give issues sooner than slow. So if your running 2950 with rl23 or N555 you may be good, but probably not with rl16 or 4350. Each barrel will be a little different though.

 

[EdHarley]

Around mid 2900s and up is when issues will come up. You can push them over 3k with no signs. But its wont live there. The faster burning powders will give issues sooner than slow. So if your running 2950 with rl23 or N555 you may be good, but probably not with rl16 or 4350. Each barrel will be a little different though.

Excellent, good to know. I am shooting for 2920, which is where I feel I have a node but have been as high as 2950 with N555. Thank you.

 

[JezL]

I’m definitely interested in seeing their results as well. I’m curious if they used lapua brass rather than Hornady if their results would be any different or not. Or if pressure is the same between different manufacturers of brass? It will be interesting

Frank used Hornady brass ... I asked the same question on another forum

"...Brass was all Hornady brass. Why? Because Hornady needed to know the lot number of the brass for hardness etc "

 

[FrankG]

The pressure test barrel went into the fixture this morning. So testing is underway!

 

[noahburleson1]

The pressure test barrel went into the fixture this morning. So testing is underway!

Very nice thanks for updating us sir!

 

[FrankG]

Frank used Hornady brass ... I asked the same question on another forum

"...Brass was all Hornady brass. Why? Because Hornady needed to know the lot number of the brass for hardness etc "

Correct.... so the calibration numbers could be put in for that brass lot. This way a variable is taken out of the equation for pressure testing. The less variables.... the more accurate the data is going to be.

 

[FrankG]

I should have all the data by the end of this week. All the testing with the N555 powder is already done. I was given some numbers over the phone but I'll get it all complete in a spread sheet later.

 

[DocDoc]

My rule of thumb has been 0.001 expansion over factory with that brass at the .200 line was hotter than you wanted for a regular diet. Back off .5-1 grain.

 

[Browning442]

What velocities are people seeing with 24-26” barrels, with 180 hybrids, over H4831sc or H4350?

 

[FrankG]

What velocities are people seeing with 24-26” barrels, with 180 hybrids, over H4831sc or H4350?

Offhand.... don't know. I'm not following any short barrel stuff. Just F class stuff.

A good rule of thumb... 25fps per inch of velocity loss. So take 6" off that 32" test barrel x 25fps that would give you about a 150fps. So if the rounds are coming out at 2950fps. That would give you 2800fps with a 180gr type bullet out of a 26" barrel.

That makes sense and seems realistic out of a 26" tube.

 

[Airborne-350G]

What’s a good starting load for RL-16?

 

[noahburleson1]

What’s a good starting load for RL-16?

With the 180 hybrids in a 32” barrel I would start at 53.5gr which put me around 2900fps. I don’t have any experience with other bullets.