300 PRC pet loads

[mrcheesemoose]

Didn’t see a thread for 300 PRC load data. I want to collect some good loads people have tried to spare precious powder and primers for us that load 300 PRC.

I’ll start:

78 grains H1000
200 grain eldx
CCI 34s
Federal brass

Gives me pretty solid groups and right around 3000 fps in my 26 in barrel

 

[rustyinbend]

Rifle is a Barrett MRAD w/ 300-PRC Barrel Kit
Lapua 2x brass
Retumbo 77.4
Berger 220 LRHT
Federal GM LR Primers

Velocity 2,878 ft/sec
SD 6.32
ES 24

Dings 2'x2' steel at a mile all day long.

 

[max1840]

Mausingfield
Bartlein - 26" MTU - 1:8.5"
Hornady Brass 1x Fired
CCI250 Primer
RL26 - 75.4
Berger 230 LRHT
CBTO - 2.917
FPS - 2891
SD - 8.2 ES - 23

 

[drifter308]

Tempalar V2
Bartlein 26" 1.25 straight 1:9"
ADG 1X Brass
78.0 H1000
230 Berger OTM
CBTO 2.995
FPS 2,886
SD 2.6 ES 5

 

[yej0001]

Follow

 

[Huskydriver]

78gr retumbo. 26" 1/9

 

[HemiPowrd]

Made it out to the range today. Loaded up 40 rounds with 77.3 gr of H-1000. Loaded long and had to single feed each round.
Bartlein heavy 30" 1:9 twist
Virgin ADG brass
Hornady 230 gr A-tip
77.3 gr H-1000
CCI 200 primers
COL 3.826"
Jump 0.015"

Barrel looks it was still speeding up with 110 rounds down the pipe. Getting around 2865 FPS now. This may not be my final load just yet since I was using virgin brass and speed on the barrel may still be climbing, but I'm thinking it'll at least be close.

Barrel tuner test target. Looks like tuner in position 12 is dead nuts. Two shots at each dot.

 

[Max_The_Phoenix]

Ok looks like I was able to finalize my load today.
Load #1
220 LRHT
Cci 250
77.4gr Retumbo @ 2856fps
SD: 2.4, ES:4

Load #2
220 LRHT
Cci 250
78.6 gr Retumbo @ 2907fps
SD: 9.1, ES:18

Both are making 0.28 MOA 3 shot group at 100 yards.

 

[mrcheesemoose]

Ok looks like I was able to finalize my load today.
Load #1
220 LRHT
Cci 250
77.4gr Retumbo @ 2856fps
SD: 2.4, ES:4

Load #2
220 LRHT
Cci 250
78.6 gr Retumbo @ 2907fps
SD: 9.1, ES:18

Both are making 0.28 MOA 3 shot group at 100 yards.

What’s the barrel?

 

[Max_The_Phoenix]

What’s the barrel?

Bartlein HV 1:9 28" with 250rds

 

[Kickin45]

Ordered a new barrel 2 weeks ago. 1:8tw, 28” for the DT SRSa1.
Talked to the Berger rep Friday (can’t say enough good things about their customer care). He gave me some incredible insights for the 230 & 245 Bergers. I’ve never shot them, but am excited to develop a load for them.
I’ll update here as that load developments.
My goal with the 245’s is 2850-2875fps and single digits.
Your guys info has been incredibly beneficial. Hope I can soon return the favor
Fingers crossed

 

[Jink00]

Didn’t see a thread for 300 PRC load data. I want to collect some good loads people have tried to spare precious powder and primers for us that load 300 PRC.

I’ll start:

78 grains H1000
200 grain eldx
CCI 34s
Federal brass

Gives me pretty solid groups and right around 3000 fps in my 26 in barrel

I just did a load workup for my bergara wilderness hmr 26in barrel. My rifle loved
Adg brass
H1000-79.9 gr (over book no pressure signs)
Wlrm primers
220gr eldx
.042 off lands
3010 fps sd of 7.6
It shot .64 outside to outside on 2 4 shot grps

 

[Kickin45]

I just did a load workup for my bergara wilderness hmr 26in barrel. My rifle loved
Adg brass
H1000-79.9 gr (over book no pressure signs)
Wlrm primers
220gr eldx
.042 off lands
3010 fps sd of 7.6
It shot .64 outside to outside on 2 4 shot grps

What is your OAL?

 

[Jink00]

What is your OAL?

3.580

 

[SaltyDog89]

New to 300 PRC with a new Sig Cross here in 2025! Only about 40 rounds into the new rifle and it's meeting all expectations so far for where I hoped it would as I continue fine tune my first load work up. Also working on improving my reloading skills with it. Strange, I thought there would be more forum discussion for the 300 PRC but maybe I just need to look harder. For the first time with any caliber I'm also doing a "never buy any rounds" thing with it and it's looking great already to be on this path.

Current Load: Sig Cross 24" barrel
H1000; new Lapua Brass; BR CCI primers; Berger Hybrid Target 215 Grain bullets
- Currently settled on '81.20' grain of power; with 2.915" Ojive; 2.260" neck and 3.700" COAL.
- Last read of 10 consecutive shots yields a 11.1 STD (Spread of 33.9 ) and 2,926 fps average
- Grouping right at 1 MOA with 10 shots (1/2 MOA with fewer shots so the shooter does the best that he can here and the variation increases with more rounds of course)
- I have installed an Arken 35x scope so, seeing the target very clearly at 100 yards is of course like it's a foot from the barrel.
- All internal necks dry lubed and run through a 30 cal carbide mandrel for new brass
- So far, all fired rounds so far with RCBS Charge Master 1600 only with its associated power accuracy
- As far as I can tell, I have not seen any signs of tight bolt or case issues with this rifle and the 81.2 change load.
- I must give credit to the Sig Cross; recoil somehow feels right at or a little less that my 308 with this rifle but it could also be too just feeling less in my shoulder with age..

Questions/Comments to anyone familiar here: (In short; how to push for better SD and tighter groups of course?)
- First time use with H1000 powder and it seems darn good; hard to know what powder could be 'better'? I have a 30 cal can but not used yet until I have my initial work up complete and proven repeatable.
- All my future rounds will be using the FX-120i scale for the better accuracy (just got it) so TBD on how that improves STD or not yet...?
- I'm sticking to the MAX 3.700" COL allowed so the rounds fit in the pricy rifle mags. These Berger Hybrid bullets hit my lands at about 3.745" so hard to push beyond 3.700" here with little interest to work up single load rounds. Too bad it's that far off so you kind of have to tune loads right at MAX COL which feels like you leave accuracy on the table.
- Still on 1st round with new brass.. No experience with neck turning and it seems painful so we'll see if I get into that later.
- COST of ownership here (just bullet material) which is interesting:
- $3.05 each first use; $1.35 each new reload which really shows how pricy the brass is

 

[HemiPowrd]

I recently started using Neolube 2 on the inside of the case necks when seating bullets. It cut down my SD significantly.

 

[SaltyDog89]

I started using Neolube 2 about 6 months ago and is now part of my default case prep process for everything I load now. It would be interesting to hear from anyone that thinks this is not wise or can cause issues in some manner?
New on my table to apply to the next rounds loaded:
- Full case length seating die; new micrometer Forster 300 PRC sitting on my desk ideally helps with some of edges of consistency
- I'm not sure on the 81.20 grain powder case fill % with lapua brass but it seemed to land in a stable power charge so I'll stick with it.
- I won't neck bump until 2nd+ brass firings so and will target .003 bump later to see how that improves. We'll also see how that changes my seating depth or not when I do?
- Will pass on neck turning for now.. Yea, controlling brass neck thickness seems to be a big deal with the experts but I'll get to it in due time once I really lock in everything else consistently. Neck spring back and all that is also a known thing but for now it's hard to quantify without running a mandrel through again and feeling differences which may be another thing to worry about at some point later as well.
- Primer Seating: I have old school single Hornady press and my primers they get 'mashed' into bullets per this simple press process. This is another area of concern but I'm not ready to shift from standard whatever seating all the way to perfect seating with a $700 primer seater just yet, but TBD.

 

[Williamtell]

2x fired Lapua brass 2.575" and 0.002 shoulder bump
Grand 77 gr
Fed 215M Match primers
208gr Barnes LRX
.050 off lands
3.693 OAL
2930.5 avg mv
SD 4.4
Spread 14.3
0.54" 5-shot group

Christiansen Arms Mesa Long Range
26" barrel 1:8 twist

 

[Williamtell]

I started using Neolube 2 about 6 months ago and is now part of my default case prep process for everything I load now. It would be interesting to hear from anyone that thinks this is not wise or can cause issues in some manner?

A quick Google search stated;

• Neolube No. 2 is a dry lubricant:
  It's designed for applications where a dry, non-corrosive, and non-freezable lubricant is needed.
  
  
• Colloidal graphite:
  This is the primary lubricant in Neolube No. 2. While effective for certain uses, it might not be ideal for a rifle barrel where consistent lubrication is crucial.
  
  
• Not recommended for threads:
  Neolube No. 2 is explicitly stated not to be used for lubricating threads in areas where temperatures exceed 400°F.
  
  
• Not recommended for oxygen environments:
  Neolube No. 2 is also not recommended for use in oxygen environments.
  
  
• Potential for friction:
  The dry nature of Neolube No. 2 could lead to increased friction in the barrel, which could impact accuracy and potentially damage the barrel over time.

 

[Emerson0311]

V570 77 gr 245 Bergers Rem 9 1/2 LRM 2744fps

 

[Kaldor]

Working on a few for my 300 PRC

77.6gr Retumbo
220 Berger
2890fps
Fed GM215M
Lapua brass
20 thou off lands
30" Bartlein 9 twist
Im sure I could get some more velocity out of this one, but its accurate, and thats all I care about. Ive shot this load with pretty good results at 1000 and 1200 yards.

I do have a 220gr SMK load with Retumbo somewhere, but Ill be damned if I cant find it. Its a "good enough" load for steel on the home range that only goes to 700. And its quite a bit cheaper per squeeze of the trigger and the 220 SMK seems to be alot more available.

Currently working on 200.20x bullets, N570 powder, and a few other things. Got the N570 and 200.20x's cheap'ish, so I figured why not. Also messed about with 185 Juggs and Retumbo, but wasnt really a great combo. Also tried N555 which was really accurate, but topped out in velocity at about 2725 with a 220 SMK for obvious reasons but for steel blasting, they were fine. Might revisit that with some 185s at some point as the N555 does better with lighter bullets. Local shop sells quite a bit of Bergers, so I asked them to order some 245 Bergers for me, but no idea when those will show up.