The PRC die "problem"

[Alex Wheeler]

Your comparing max case to min chamber. The real numbers are the brass vs min chamber. So .530 for ADG brass and .533" for min chamber. In the 7 saum you have .545 ADG brass, .551 chamber. Min vs Max specs do not always reflect on reality.

 

[nwmnbowhunter]

3rd firing of hornady brass in 300 prc.

Had done ladder tests up to 81 grains of RL 26 before bolt was stiff.

Today was doing group tests and blew a primer at 78 grains of RL 26.

Web width after each firing.
1st - .531
2nd - .5315
3rd - .533

I'm done with hornady brass.

Luckily got a hundred new ADG brass yesterday finally.

Not sure what my plan is. Will be measuring brass closely in this rifle.

Right piece of brass is the blown primer.

 

[highdrum]

3rd firing of hornady brass in 300 prc.

Had done ladder tests up to 81 grains of RL 26 before bolt was stiff.

Today was doing group tests and blew a primer at 78 grains of RL 26.

Web width after each firing.
1st - .531
2nd - .5315
3rd - .533

I'm done with hornady brass.

Luckily got a hundred new ADG brass yesterday finally.

Not sure what my plan is. Will be measuring brass closely in this rifle.

Right piece of brass is the blown primer.

View attachment 242877

View attachment 242878

ADG will grow at the web too with warm powder charges. The brass is pretty thick at the web too and will resist sizing. The best thing to do: send your barrel to a good smith and have him open up your chamber by a few thou at the web area. I've done this with my 6.5prc and I'll be firing it for the first time since modification, tomorrow hopefully.

 

[nwmnbowhunter]

So I got the pressure spike on 3rd firing of hornady brass.

Let's say a person gets the chamber enlarged, how many firings could a person expect in the 300 PRC?

 

[dwent1811]

Hello all. I was made aware of this issue from a thread on another hunting forums. Just finished putting together my 300 PRC with a proof carbon prefit. Waiting on the Lapua brass to get here supposedly at the end of the month, but it seems sooner or later I'll likely be experiencing this issue. After reading every page of this thread I think I have a pretty good understanding of the problem, though the video describing the "clicking" issue referenced on page three no longer works.

Has anyone actually opened their chamber up yet, be it with a larger spec'd reamer or polishing?

 

[nwmnbowhunter]

Hello all. I was made aware of this issue from a thread on another hunting forums. Just finished putting together my 300 PRC with a proof carbon prefit. Waiting on the Lapua brass to get here supposedly at the end of the month, but it seems sooner or later I'll likely be experiencing this issue. After reading every page of this thread I think I have a pretty good understanding of the problem, though the video describing the "clicking" issue referenced on page three no longer works.

Has anyone actually opened their chamber up yet, be it with a larger spec'd reamer or polishing?

Make sure you know what a clicker is and keep your eye on it. Mine was showing them and without this thread i wouldn't have recognized what they are. Video doesn't work for me anymore either. I was able to watch it before.

 

[Deleted member 103481]

Alex deleted his YouTube

there is a clicker video at the bottom of his site videos

Videos | wheeleraccuracy

www.wheeleraccuracy.com

 

[highdrum]

Hello all. I was made aware of this issue from a thread on another hunting forums. Just finished putting together my 300 PRC with a proof carbon prefit. Waiting on the Lapua brass to get here supposedly at the end of the month, but it seems sooner or later I'll likely be experiencing this issue. After reading every page of this thread I think I have a pretty good understanding of the problem, though the video describing the "clicking" issue referenced on page three no longer works.

Has anyone actually opened their chamber up yet, be it with a larger spec'd reamer or polishing?

I had my 6.5 prc opened up in a lathe. My 7-300 prc is still being built, and waiting for his set back reamer to arrive. My barrels already chambered but the new reamer will open the web up an extra 2k.

 

[dwent1811]

I had my 6.5 prc opened up in a lathe. My 7-300 prc is still being built, and waiting for his set back reamer to arrive. My barrels already chambered but the new reamer will open the web up an extra 2k.

Thanks for the pointer to the video DangerRanger.

Highdrum,

Did opening your chamber alleviate the issue for your 6.5?

 

[highdrum]

Thanks for the pointer to the video DangerRanger.

Highdrum,

Did opening your chamber alleviate the issue for your 6.5?

Wanted to shoot today, but looks like tomorrow will be the first run since opening the web up.

 

[samson]

Highdrum, how did opening the chamber work on your PRC?

 

[Alex Wheeler]

I have decided to make a run (12) 300 PRC dies. Its not a thing I enjoy to do. But if people want them I will keep doing it. I have a new reamer on order and blanks will be nitrided. Stay tuned. If you guys like them I will do other cases as well.

 

[samson]

Alex, That is fantastic news. I would definitely like to be on that list.

 

[highdrum]

Highdrum, how did opening the chamber work on your PRC?

No it didn't, I'm still getting clickers above 3080fps with 145 Barnes match burners. This is brass that has 4-5 firings on it. Dies could be part the problem. I have new brass, but will wait till my small base bullet central die shows before I start using it.