300 PRC update

[b2lee]

Tried re-reading this thread...can't find what I'm look for.

Playing around with the Gordons Reloading Tool....and had to input all the case measurements since they don't have the 300PRC in the cartridge selection.....I'm stuck on Case Volume in H2O....and I don't have any empty brass to check myself....any one got an answer? I just put in 96 as a guess. And I have no idea what a 'Sebert Factor' is....so I copied the 300Norma for that

So...with guessing on those variables...I see a projected MV of 2935fps using 78.5gr of N565 on a 225gr ELD-M...and the last time I was out...I think it was 2931.....I don't think this thing asks for environmental variables....

Anyway...anyone got a closer guestimate on H2O capacity?

 

[rockin randy]

Tried re-reading this thread...can't find what I'm look for.

Playing around with the Gordons Reloading Tool....and had to input all the case measurements since they don't have the 300PRC in the cartridge selection.....I'm stuck on Case Volume in H2O....and I don't have any empty brass to check myself....any one got an answer? I just put in 96 as a guess. And I have no idea what a 'Sebert Factor' is....so I copied the 300Norma for that

So...with guessing on those variables...I see a projected MV of 2935fps using 78.5gr of N565 on a 225gr ELD-M...and the last time I was out...I think it was 2931.....I don't think this thing asks for environmental variables....

Anyway...anyone got a closer guestimate on H2O capacity?

Hornady brass 95.6 gr.

 

[b2lee]

If anyone is interested. I posted my experimentation with the Gordon Reloading Tools software and the 300 PRC over in another thread. See what you guys think: 300 PRC Gordon's Reloading Tools

 

[rockin randy]

Just got some insider info that Short Actions Customs will be producing dies and seaters for the 300 PRC

 

[catalyst81]

Just got some insider info that Short Actions Customs will be producing dies and seaters for the 300 PRC

That's awesome. Any idea on the timeline?

 

[rockin randy]

That's awesome. Any idea on the timeline?

6-8 weeks out is what I was told. Looking at their 6 BRA dies man they looking like quality. Happy to see the industry start to jump on the 300 PRC train!

 

[b2lee]

So....I'm using crap brass....substandard dies....beta bullets...and a powder/brand I have no previous experience with....and 1000 yards is boring.

Man, I can't wait to see what happens when I get the good stuff.

 

[b6graham]

So....I'm using crap brass....substandard dies....beta bullets...and a powder/brand I have no previous experience with....and 1000 yards is boring.

Man, I can't wait to see what happens when I get the good stuff.

thanks for being the guinea pig for the rest of us

 

[Steel head]

So....I'm using crap brass....substandard dies....beta bullets...and a powder/brand I have no previous experience with....and 1000 yards is boring.

Man, I can't wait to see what happens when I get the good stuff.

Taking one for the team!

 

[Merovingian]

Not reading through 42 pages. What real world velocity are you guys seeing w 215 Berger's from a 24 inch?

Not 24 but maybe this will help. 26" 1:9 / TBAC U5
215 BHT / 79.5 H1k / CBTO 2.930 (.020) / Necks to .014
1 2984
2 2968
3 2984
4 2966
5 2969
6 2989
7 2990
8 2986
9 2979
10 2971

 

[LakuNoc]

26 inch proof
230 Berger hybrid Target coated with hBN B.C G7 .380
RCC brass 78.2 Gr of H1000
1. 2960
2. 2964
3. 2960
4. 2965
5. 2965
6. 2961
7. 2960
8. 2964
9. 2964
10. 2963
Extreme Spread 5 FPS
1560 yards 16 x 16 steel 9 out 10 hits 3 mph wind.
39F
28.5 inHg
93% Humidity/ raining

 

[WeatherbyFan]

26 inch proof
230 Berger hybrid Target coated with hBN B.C G7 .380
RCC brass 78.2 Gr of H1000
1. 2960
2. 2964
3. 2960
4. 2965
5. 2965
6. 2961
7. 2960
8. 2964
9. 2964
10. 2963
Extreme Spread 5 FPS
1560 yards 16 x 16 steel 9 out 10 hits 3 mph wind.
39F
28.5 inHg
93% Humidity/ raining

Just curious what primers you were using and how far off the lands ?
Great shooting by the way and thanks for sharing your info

 

[DangerRanger]

With ADG brass coming and Wilson says they will have dies out shortly I’ve finally decided on the 300 prc.

here’s to hoping I can get over 2800 with a 215 out of a 21” with a can.

 

[LakuNoc]

Just curious what primers you were using and how far off the lands ?
Great shooting by the way and thanks for sharing your info

9 thousands of an inch jump.
CCi BR-2 large Rifle
Thank you

 

[LakuNoc]

Out to 2000 yards 300 PRC running strong!
Mausingfield Action
Carbon Fiber Proof barrel
KRG with enclosed Forend
ELITE IRON Revolution Bipod panning model
TriggerTech Dimond Trigger
APA GEN 3 Self timing Brake
SPUHR Mount 50 MOA with rail (34 Mill dial elevation )
NightForce 7-35x56 F1 Mil-XT

 

[b2lee]

For those that didn't receive an email notification....Matt at HopticUSA is taking pre-orders for the 300PRC Quiver. Mine is ordered for the MDT ACC.

 

[TEUFEL820]

Out to 2000 yards 300 PRC running strong!
Mausingfield Action
Carbon Fiber Proof barrel
KRG with enclosed Forend
ELITE IRON Revolution Bipod panning model
TriggerTech Dimond Trigger
APA GEN 3 Self timing Brake
SPUHR Mount 50 MOA with rail (34 Mill dial elevation )
NightForce 7-35x56 F1 Mil-XT

Is that the lil or fat bastard gen3?

 

[Ledzep]

So....I'm using crap brass....substandard dies....beta bullets...and a powder/brand I have no previous experience with....and 1000 yards is boring.

Man, I can't wait to see what happens when I get the good stuff.

No kidding. LOL If I didn't know any better I'd think Hornady brass is made of peanut butter according to many on this site...

 

[Surly]

What bottom metal/mag combos are you guys running for rem variant actions? I was thinking Hawkins CIP length with the 3.8 accurate mag. My apologies if this has been asked previously

 

[LakuNoc]

Is that the lil or fat bastard gen3?

Gen 3 lil bastard

 

[b2lee]

What bottom metal/mag combos are you guys running for rem variant actions? I was thinking Hawkins CIP length with the 3.8 accurate mag. My apologies if this has been asked previously

A lot of us are running Chassis systems....I'm running MDT ACC

 

[Jlknights61]

With ADG brass coming and Wilson says they will have dies out shortly I’ve finally decided on the 300 prc.

here’s to hoping I can get over 2800 with a 215 out of a 21” with a can.

Glad to see somebody else doing a shorter barrel there’s seems to be very little info on them. I’ve got everything decided for my build I think except barrel length, but I really want to do a 20”.

What made you choose 21”?

 

[Surly]

A lot of us are running Chassis systems....I'm running MDT ACC

I plan on running a manners T4A. Thanks for the info

 

[DangerRanger]

Glad to see somebody else doing a shorter barrel there’s seems to be very little info on them. I’ve got everything decided for my build I think except barrel length, but I really want to do a 20”.

What made you choose 21”?

That’s the length I can thread a rock #4 5/8 and have sufficient shoulder for a suppressor.

 

[abn31c]

Anyone else play with N565?

 

[b2lee]

Anyone else play with N565?

Yes, I do...and it is the bees knees...it is the cherry on top of a 4lb sundae...it is the greatest thing since sliced bread....at least for 300PRC.

What would you like to know that I haven't already posted above or in the reloading forum for the 300PRC?

 

[abn31c]

Yes, I do...and it is the bees knees...it is the cherry on top of a 4lb sundae...it is the greatest thing since sliced bread....at least for 300PRC.

What would you like to know that I haven't already posted above or in the reloading forum for the 300PRC?

Yep, appreciate all you have posted, just searching for more info, my rifle will be done by the end of the month. Only thing I'm lacking is a muzzle break, have about 11 pounds of h1000, but I like your results better!

 

[b2lee]

Just for some information overload....here's the load I found great accuracy with...IN MY GUN....for the 230 A-Tip with N565.

 

[abn31c]

How does brass hold up tho, have 200 hornady, but looking at ADG. I'm not a hornady hater, I think it's fine for the money.

 

[b2lee]

How does brass hold up tho, have 200 hornady, but looking at ADG. I'm not a hornady hater, I think it's fine for the money.

Out of 100 pieces of Hornady Brass, I tossed one piece on loading #5 and one piece on loading #6 due to loose primer pockets. I blame that on me hot rodding some of my loads. I fully intend to buy 200 pieces of ADG and do a comparison on both brass life and changes in powder charge due to case volume.

The 300 PRC has been a very fun journey so far.

 

[abn31c]

Out of 100 pieces of Hornady Brass, I tossed one piece on loading #5 and one piece on loading #6 due to loose primer pockets. I blame that on me hot rodding some of my loads. I fully intend to buy 200 pieces of ADG and do a comparison on both brass life and changes in powder charge due to case volume.

The 300 PRC has been a very fun journey so far.

Thanks for all the effort, I got one to shoot matches with on windy days?

 

[Merovingian]

Out of 100 pieces of Hornady Brass, I tossed one piece on loading #5 and one piece on loading #6 due to loose primer pockets. I blame that on me hot rodding some of my loads. I fully intend to buy 200 pieces of ADG and do a comparison on both brass life and changes in powder charge due to case volume.

The 300 PRC has been a very fun journey so far.

Leave some for the rest of us would you! LakuNoc's pulling 3ES with that damn RCC and coated barrel. Gotta get my mid 20's into the teens at least just to keep up. Who am I kidding......I was thinking about getting 200 myself.

As for reloads, loss rate slowed a bit. Loss rate is about 10% on 5th, 6th, 7th, running 8th soon. Only a couple more that were imminent to split the rest pockets. In retrospect, think what may have happened is the brass I'd shot out of the first chamber are the ones that prematurely failed accounting for that high loss rate on #4.

 

[B_w.]

Need to order some powder...any consensus between Retumbo or H1000 as the best place to start? Need temp stable powder up in Canada.

Will be working with once fired Hornady brass. Projectiles TBD.

 

[b2lee]

Need to order some powder...any consensus between Retumbo or H1000 as the best place to start? Need temp stable powder up in Canada.

Will be working with once fired Hornady brass. Projectiles TBD.

Depends on the bullet you are going to be using. You may find H1000 works best for the 215 and 225 and Retumbo may work best in the 230 and 250 A-Tips. Every barreled action is different....so try some of each and see what your gun likes.

I found N565 to be my magic sauce....and if you see a Unicorn walking around...put a round in him and grind his horn up to make some RL-26...because I hear that is where it comes from.

 

[Pools1]

Hello all. My name is Dave I don't know allot of you. I have been following from the start.
I have 3 builds going. One for each son, and one for myself.
I broke in both barrels for my two boys using horn factory 225 eldms.
I was getting 2930ish fps with proof 10 and 9 twist barrels.
I pulled a bullet and got 79.3 grains of ????
I called hornady and gave the lot #. Rep at horn looked up the lot#
And said yup you are correct 79.3 gr of retumbo.
for your info.

 

[b2lee]

So that's who has been snagging all the Retumbo

 

[ultraviolet]

BRASS - RCC (Machined Brass)
AMP AZTEC
Pilot #31
Pilot Code #31B
AZTEC CODE = 174

Did you pick a sacrificial case after weighing and measuring neck thickness?

If so, do you still have those measurements of that case? I weighed all 50 of my RCC cases. I have yet to measure neck thickness. Weight is in grains. FX120i calibrated with 100 gram weight.

SN​	Case weight​
001​	293.06​
002​	293.26​
003​	293.64​
004​	291.18​
005​	291.10​
006​	294.90​
007​	294.76​
008​	288.06​
009​	291.80​
010​	286.80​
011​	286.74​
012​	286.54​
013​	287.32​
014​	292.74​
015​	294.42​
016​	288.16​
017​	291.68​
018​	292.90​
019​	287.42​
020​	289.34​
021​	289.08​
022​	288.64​
023​	289.56​
024​	290.72​
025​	291.32​
026​	292.90​
027​	293.92​
028​	287.60​
029​	294.04​
030​	293.18​
031​	287.00​
032​	287.12​
033​	291.96​
034​	294.06​
035​	287.16​
036​	294.14​
037​	291.50​
038​	286.98​
039​	289.62​
040​	294.32​
041​	294.22​
042​	291.92​
043​	286.98​
044​	294.54​
045​	289.72​
046​	294.82​
047​	293.98​
048​	287.02​
049​	290.90​
050​	290.38​
​	​
average​	290.90​
std dev​	2.80​
median​	291.25​

Has anyone attempted to update the AMP's firmware? The Windows application itself could use some TLC. Anyway, the Windows application failed to communicate with the AMP plugged into the computer via USB. Windows detected a USB device, did a dance with drivers, all seemed well. But the application complained about not finding the AMP when I tried the "show AMP information". And also seemed to have little interest in providing feedback about the communication to HQ to retrieve the updates (if there are any).

 

[ultraviolet]

Yea it is lol...RCC was suppose to send me a few extra cases for that purpose. However, i think they forgot. Got exactly 50 cases ?

I did speak with Jeff today. Having issues chambering a case. Shoulder too wide. Will have to try and re-size and re-chamber. Hopefully this works.

This was my fault, i didnt have chamber specs yet and ordered blindly. RCC willl work with you to rectify the issue. Great customer service!

Update: I'm a dumbass! I used the wrong die...a neck die instead of a FL die. Luckily i had a spare set of Hornady dies which included a FL Bushing die. This worked out, I'm now able to chamber my $6/case brass ?.

FWIW, the RCC brass (SAAMI 300 PRC spec) I received went about halfway into my 300 PRC barrel until I body sized it. Now I believe (barrel is not matted to an action ATM) it'll chamber completely and snugly. My barrel was reamed with a Hornady spec'ed reamer.

Does anyone know if the SAAMI 300 PRC reamer differs from the Hornady spec? I don't recall if that was mentioned in this thread...

RCC will also make brass to fit your specific chamber if you wish. Probably best to contact them first to let them know you'd like to have some custom fit brass. They said they can measure fire formed brass or if you want something real tight, a chamber casting.

 

[Dooby]

@ultraviolet No, i didn't weigh any cases (I know, i was suppose to). I did have issues updating the AMP. It seems to just be stuck. However, i was able to get the update for the 300PRC previously.

for the RCC brass, for whatever reason, the measurements they sent me were not the same as what i got. right at the shoulder/body diameter, it measure same as a fired case ~0.518". Resized it to about 0.515". It did make the case grow to ~2.583", which is too long but still fit, so i just fireformed it as is. Numbers actually weren't great but i was doing a spiral test. there were some pressure signs on the primers but that was due to the whole case being slightly too long.

I've since resized and trimmed to about 2.576" (1XF), but i haven't loaded these up yet. I've got 10 cases left to fireform. with H1000, seems like there's a node around 75.2gr @ ~2815fps.

 

[ultraviolet]

@DDRH65CM The dimensions of the RCC brass I received matched (AFAICT) the diagram they sent for me to approve. The base OD of the RCC was ~0.532" and shoulder OD ~0.519". One Hornady unfired brass measured ~0.528" and ~0.513". And a once fired Hornady case measured ~0.529" and ~0.515".

I didn't jot down the numbers of the resized RCC case but that ~0.515 you mentioned sounds familiar.

I'll have to check the length yet and I may still have to bump the shoulder back. I have some time before the barrel is attached to an action though.

FWiW I have and used the Whidden gunworks full length sizing die. It resized the RCC enough to fit in the chamber .

 

[b2lee]

Wow, has anyone actually looked at the stats for this thread? 2130+ posts... 233k+ views...that should tell you there is a huge interest in this cartridge over the last year and a half.

When I became a very early adopter, I never thought it would catch on as quick as it has. I still remember the very early days of the 6.5 Creedmoor and I was one of the crusty old guys saying that shit will never catch on and the 308 is where it is at for long range shooting you dumb whipper snapper.....and I was right... the 308 300 PRC is where it is at

 

[TheChief]

What bottom metal/mag combos are you guys running for rem variant actions? I was thinking Hawkins CIP length with the 3.8 accurate mag. My apologies if this has been asked previously

I'm running mine in a KRG bravo with CIP length 3.850" Accurate Mag mags. I had to open the feed lips ever so slightly towards the chamber end to get them to feed reliably however after doing that it feeds so smoothly you can't feel any round engagement at all.

 

[rfurman24]

26 inch proof
230 Berger hybrid Target coated with hBN B.C G7 .380
RCC brass 78.2 Gr of H1000
1. 2960
2. 2964
3. 2960
4. 2965
5. 2965
6. 2961
7. 2960
8. 2964
9. 2964
10. 2963
Extreme Spread 5 FPS
1560 yards 16 x 16 steel 9 out 10 hits 3 mph wind.
39F
28.5 inHg
93% Humidity/ raining

It must be pretty strong brass. I am smoking Hornady brass at 3-4 firings at 2890 fps with 230 Hybrids.

 

[rfurman24]

Walked out the door and forgot the 250gr A-Tips loaded with Retumbo/N565/RL-33.. DOH!!!

However, I did manage to take the big box of ammo that I wanted to do temp stability of the N565 loaded with 225gr ELD-M's. I was pleasantly surprised to see not much reduction in velocity in much colder conditions. I dropped about 1fps per degree F. Today was slightly cold....35F when I shot....some would call that 'mild'...but I couldn't shoot less than a 1/2" 100yd group to save my life because this southern boy was shivering a little....micro shivers. Vertically was great....side to side was bleh.... so 78.5gr of Vihtavuori N565 pushing a 225 ELD-M equals:

View attachment 7202195

6th firing on Hornady brass....SD 4.0...ES of 11...time to anneal

Shot out of this old thing:

View attachment 7202196

Notice the Cerakote on the bolt wearing away....notice the carbon after the muzzle brake. #NOSAFEQUEENS Rifle was built to work...not look pretty in a locked safe....and yes...it's about to get a detailed cleaning and a bedtime story.

I may have to give N565 a try in mine.

 

[81sfo]

With ADG brass coming and Wilson says they will have dies out shortly I’ve finally decided on the 300 prc.

here’s to hoping I can get over 2800 with a 215 out of a 21” with a can.

Just curious which can will you be using on the short 300 prc? I'm thinking of doing the same length and running the AAC titan can. It should survive .

 

[Rocketmandb]

Need to order some powder...any consensus between Retumbo or H1000 as the best place to start? Need temp stable powder up in Canada.

Will be working with once fired Hornady brass. Projectiles TBD.

I've settled on RL-26, but, as B2Lee said, I had to hunt unicorns to get it. I'm currently loading 71.8gr with Berger 230s, but then I'm also using prepped and fire formed RWS 8x68S, which has less case volume than Hornady. Out of a 28" barrel, it's getting me about 2820 fps or so. My SDs are in the 5 range.

The RWS brass is working very well for me.

I'll be posting part 3 of my Science of Recoil videos in the next day or so. It focuses on the effect of recoil on accuracy, and has some shots/groups with my 300 PRC at 500 yards. Really interesting results showing the effects of shooting with a hard shoulder and improper positioning behind the rifle.

 

[DangerRanger]

Just curious which can will you be using on the short 300 prc? I'm thinking of doing the same length and running the AAC titan can. It should survive .

custom can. 10” titanium tube,welded stainless 10 baffle stack.

Im considering buying a naked/polished can specifically for that gun all the metal on it will be polished stainless so I think apolished can would look really good. TBAC said they could sell me a bead blasted one pre ceramics (edit cerakote) but idk how much work it would be to polish it.

 

[b2lee]

TBAC said they could sell me a bead blasted one pre ceramics but idk how much work it would be to polish it.

If you have a nice bench grinder with a soft polishing wheel....shouldn't take much time at all...probably polish it every time you shoot it as well.

I'm going the opposite....sponge camo on the barrel because the discoloration at the FDE muzzle brake is too tough to remove...so just camo it and forget it...heh.

 

[DangerRanger]

If you have a nice bench grinder with a soft polishing wheel....shouldn't take much time at all...probably polish it every time you shoot it as well.

I'm going the opposite....sponge camo on the barrel because the discoloration at the FDE muzzle brake is too tough to remove...so just camo it and forget it...heh.

I figured with a wheeler accuracy building 300prc it needed to be really shiny or else it’s no longer fair chase

hmm you make it sound quite easy to polish the titanium... I’m tempted to give it a shot.

 

[b2lee]

I wouldn't call it easy...but once polished and you heat it up shooting...you will see some really cool colors forming. You may decide you like the look of the colors and not polish them out again.