300 PRC load info

[8andbait]

I'm not worried at all, just providing information. It's perfect for the Hornady bullets.

If I were going to spec a reamer for the 215's I'd go a little shorter, personally.

 

[Weatherby Fan]

Some groups from the first Kimber Montana 300 PRC build with a 26" Hells Canyon Armoury CF Barrel,1-9.5 twist, 76.0grs and 76.5grs R26, 215M primers
Bottom left is Hornady factory 225gr ELDM ammo

 

[8andbait]

Looks great, 76 of rl26 seems like a sweet spot in mine too.

 

[Vol1975]

Anybody shot the n570 with the 300 prc

Just curious bc I have h1000, r26, and n570 and trying to figure which one to start with

 

[elkaholic]

Anybody shot the n570 with the 300 prc

Just curious bc I have h1000, r26, and n570 and trying to figure which one to start with

N570 gives top velocity and good accuracy in my 30 SM. My hunting load is a 230 Berger ahead of 83 grains for 3030'
I would start with 80 grains behind a 215 in your prc.

 

[jasonco]

I too am there on a 300PRC build and just want the data on just a 300PRC, and only 300PRC, not an improved, not a shortened, not a length'd, blown out, Hornady brass is @#$! etc etc.

 

[elkaholic]

I too am there on a 300PRC build and just want the data on just a 300PRC, and only 300PRC, not an improved, not a shortened, not a length'd, blown out, Hornady brass is @#$! etc etc.
View attachment 147307

The case I cited is the same case and ive shot it for years. The load of 80 grains should work very well in it. Im trying to be helpful but it if you dont want to use it, dont!

 

[elkaholic]

I think the prc has .242" FB

Actually, the prc FB is .2328"

 

[8andbait]

Went back out with some RL26
85 degrees, 10-20 mph wind from 5 to 11 clock positions.

I'm surprised it turned out this good. I left my truck running with the AC on high. Took the gun out get prone, find the target, close the bolt and shoot as quickly as possible then put rifle back in the truck for 4 minutes. The barrel got warm and the mirage was pretty bad but not terrible.

First target is RL26, CCI250, 215 HYB .030 jump. One shot each from 77-79 in .5 increments

326 yards

This was 212 ELDX, RL26, CCI250 at 326 yards

I still have not had any pressure signs even at 79 grains which I suppose is getting close to 3000 FPS

 

[waveslayer]

Those are some hot loads. I was getting pressure signs with old brass, 225 ELDM, 3.66" with 75.8 gr of H1000 out of a 28" barrel 1/8 twist.

Seems like it prefers 74.8gr of H1000 using the ELDM 225's. I just got in some gAy Tips in 230 to try out, so I can report back later

 

[Mc Fraser]

Got out this am

215 berger, CCI250, new brass, RL26

306 yds
75 gr 1.4" at
75.5 gr 1.3" at 2875 FPS
76 gr 1.6" at 2878 FPS

Moved out to 605 and fired 3 rounds with 3 minutes between shots.
77.7 H1000, 215 HYB, 215 primer
2893 FPS SD of 6 for three shots

View attachment 147288

I am curios when you try fired brass if the group changes. in all my rifles once fired brass performed better than brand new.

I really like how 212 eldx works. This is great hunting bullet for sure.

 

[vancewalker007]

I am curios when you try fired brass if the group changes. in all my rifles once fired brass performed better than brand new.

I really like how 212 eldx works. This is great hunting bullet for sure.

I've found the same result in 3 separate rifles when using good brass. A 300 WSM, 7mm LRM, and a 6.5 PRC using quality brass all shoot best on that second pass. Lesser brass like Winchester seems to go the other way as the case volume seems to increase enough to throw off pressures.

 

[waveslayer]

Even good brass will fire form, so no difference in the brass make. Brass thickness will change the case volume which will vary on each brand of brass. Lupua is just more consistent and thicker at times, makes for it lasting longer.

Depends on your load work up when it comes to what shoots better. Unfired brass usually has less case volume.. more pressure more velocity. Once fired depending on how you have your dies set will increase about 1gr in case volume. For big bore rifles that's about .4 gr of powder . For example my Lazzeroni with new brass takes 94.2 grains of Retumbo. Once fired takes 94.6 grains of Retumbo and I get the exact same velocity and POI.

Bottom line. No matter the brass maker, know what your chamber is. So test both. Measure before and after.

300 PRC unfired is 94.5 gr of case capacity, once fired in my chamber is 95.6, all verified by 20 different pieces of brass. Load it up in quickload and you will learn a lot about different brass makers. Its brass thickness which effects neck tension and case capacity... so if you make a good load with Winchester brass it will be as accurate as Lapua. It may not last as long, but in my .308 Winchester brass has been better than Lapua... for me that is.

 

[JAYgs8163]

Got mine a few weeks ago. Had a issue with the bolt which needed addressing and is now back. Going to start load development next week. Shot factory ammo to break in and was very accurate. Can't wait to get some handloads down the tube. I'll add my results after testing.