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[8andbait]

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[venatic]

Is this new brass?

 

[Deleted member 25294]

I'm starting this to hopefully give info to those who are interested in the
300 PRC.

Specs on rifle
Lone peak stainless razor action
Bartlein 3B barrel, 26", 9 twist
McMillan game hunter
Hawkins BDL
Hawkins brake
Trigger tech trigger

Bare rifle
View attachment 143612

With NF NX8 2.5-20x50
View attachment 143613

This a very tight bore, only .0005-.0008 over .308.

I started off with 4 212 Eldx, 77.5 H1000 and 215 primers. I fired all 4 over the magnetospeed. Average velocity was 2961, no signs of pressure. They were very difficult to chamber even at a .015 jump.

I then cleaned the barrel, please no comments on break in, I do what I want lol.

Next I shot 1 225 ELDM with 75H1000 and 215 primer, this one went 2855 on a clean cold bore.

Next I shot a three shot group, these were difficult to chamber as well but a little easier than the ELDX.

View attachment 143614

I cleaned again...

Next up was the 215 hybrid at .015 jump with RL26 and cci250 primers.
I had a 76, 76.5 and 77 so I fired the 76.5 load with a clean bore, 2955 FPS then the other two at the target.

View attachment 143616

After that I moved back to 324 yards for the ladder test, it was windy, 88 degrees (mirage) and sunny.

I started with a clean bore, 215 HYB at .015 jump and RL26 with cci 250's.

Loads ranged from 75 to 79.5 grains in .5 increments. About 2.5" of vertical over 4.5 grains with bad mirage and inconsistent wind.

View attachment 143619

I never had any pressure signs even with 79.5 this is the 79.5 brass

View attachment 143620

I had two other ladder test with H1000 and 225 ELDM's and 212 ELDX's with H1000 and RL26 but due to the effort needed to chamber the Hornady bullets I decided to work with the 215 hybrids for the first 100 or so shots to see if the throat "loosens up" a little.

I will periodically try to chamber the Hornady bullets, once the start to chamber easily I'll start testing them.

Tomorrow I'm going to test groups with 215 HYB, RL26 and cci 250's

I've loaded up 76.1, 76.4, 76.7 and 77 since I liked that charge area on the ladder test and the speed is right where I want it 2950 ish.

Only 21 rounds through the bore so far.

I plan to get out earlier tomorrow to beat the heat and mirage.

Awesome keep us updated!
What was your velocity with the 215 and 79.5 grains RL26?

 

[8andbait]

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[L.Sherm]

This a very tight bore, only .0005-.0008 over .308.

I'm not understanding this part, the bore should be .300 and groove .308.
How did you measure?

 

[venatic]

I'm not understanding this part, the bore should be .300 and groove .308.
How did you measure?

I am a little confused as well? I have been loading for the 300 PRC since last October and all my work has been with Hornady bullets from 208's to 225's with no issues at all. So far used Reloder 26/25 and H1000 and Retumbo and IMR 8133.
My barrel is a Bartlein as well 1/10 twist

 

[8andbait]

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[venatic]

So the Hornady bullets aren't seated as straight as the Berger's?
I still am confused as to why if both brands are seated .015 off lands then how can one be tight and the other not.

 

[8andbait]

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[8andbait]

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[Deleted member 25294]

**** that's a bummer..
It sounds like your throat was undersized if you were having difficulty chambering and you weren't jamming into the lands

 

[L.Sherm]

The saami throat dia. on a 300 PRC is .3088. If there truly that big I'd be calling hornandy and asking W.T.F.
I would also be having my Smith check his reamer.

 

[8andbait]

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[338 dude]

Fired a few this morning, still tight chambering.

Got home sized some fired brass .000-.002 runout. Seated an ELDX to .020 jump and it was still difficult to chamber.

I called the smith and he ordered a new reamer.

So I'll start a new thread when I get the new barrel with the new reamer.

This one actually shot pretty good considering.

Sounds like your neck is a little tight if your a hand loader you might want to start turning necks on your brass I like to have .004or even .004 clearance