300 PRC update

phlegethon

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    Someone in Discord asked me to post a video of the AMP Mate running some 300PRC brass. Please forgive the shaky cam footage...I couldn't find my camera tripod. Just a quick short showing the function. Some say it is slightly pornographic in nature.

    I need to set mine up...
     

    Rocketmandb

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    I am currently running a Forster FL die with the .3085 expander ball (Hornady once fired, annealed, and chamfered with Henderson Trimmer) and am having issues with the seating pressure exceeding 100psi with Berger 245s. I am using the 21st Century Hydro press and with a wilson die. 21st Century is sending me a 200psi handle for the press. I have not tried the Lapua brass yet, but all this talk about tight necks has me curious. Shoot if I am already at this PSI with Hornady brass, I am only guessing it will be higher with the Lapua Brass. How are you only getting 10psi? I don't have all the measurements handy now, but with the .3085 expander ball and bullet diameter, I am at 1thou of neck tension.

    Are you using graphite lube? See thread below where I'm capturing data to fine tune using a mandrel.

     

    Rocketmandb

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    Someone in Discord asked me to post a video of the AMP Mate running some 300PRC brass. Please forgive the shaky cam footage...I couldn't find my camera tripod. Just a quick short showing the function. Some say it is slightly pornographic in nature.


    You are far more of a tech geek than I am...
     

    dwent

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    I'd say the stringing is coming from whatever that rest is....just throw an Atlas on the front and shoot. Always practice your groups exactly the way you intend to shoot for reals.

    Yeah, I’m going to mess around with it. I got an earful from Boyd Allen over on accurate shooter for using my RRS and not doing load development from a free recoiling rest, so that’s what your looking at there. I think the spool it is sitting on is more suspect than the rest itself. If I stick with the rest I’ll probably put a bag under the front end to though.
     

    Bradv86

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    151 in stock at posting.
     

    Surly

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    Are you using graphite lube? See thread below where I'm capturing data to fine tune using a mandrel.

    I will try some graphite lube once I get the 200psi handle. Thanks!
     

    b2lee

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    There is no consensus...we all think our choice is the best. I use the LE Wilson FL Bushing die.
     

    b2lee

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    Was looking at that one earlier, is it sizing the brass correctly? Any issues?

    They all basically size the brass correctly....but a bushing die gives you more options on sizing your neck.....no issues....it may have not been the reasons for me winning....but it never cost me a match.

    I like the fit and finish better than the other brands I have used.
     

    Rocketmandb

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    What is the consensus on the best full length sizer for the PRC?

    Also note that there are a decent number of us out there that have small chambers - growing consensus is that there are some small/bad reamers floating about. I had to go custom, so got a Whidden. As @b2lee says, Wilson makes some really good stuff - I use their seaters and love them. Hornady? Tried and no - I had dramatic consistency issues. Other "mass market" dies? Haven't used them, so can't comment - been happy with Whidden, though.
     

    smokey24_24

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    I am planning an Elk hunting trip and came across a box of 200 gr eld-x. I also have the 220 gr eld-x. Which do you guys think would be better for Colorado Elk? I've tried like hell to find some 212 gr eld-x but no luck. Any other recommendations that I should be on the lookout for that would be better suited for 300 PRC and Elk? Thanks!
     

    b2lee

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    with the correct shot placement...I don't think the Elk is going to argue for or against any of them.
     
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    smokey24_24

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    with the correct shot placement...I don't think the Elk is going to argue for or against any of them.
    I agree, maybe I'm overanalyzing here...but didn't know if one may offer an advantage over the other. May just load up both and see which my rifle likes better.
     

    JBarton

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    I agree, maybe I'm overanalyzing here...but didn't know if one may offer an advantage over the other. May just load up both and see which my rifle likes better.
    My 300WM loves the 220gr ELDX but my 300PRC not so much. It likes 220gr scenars and 225gr ELDM's. Weird one.
     

    JBarton

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    I forgot to mention. I harvested my elk last year with the 220gr ELDX and my 300WM at 581yrds. I was at 9400ft and 40 degrees. I shot my 300WM out to a mile in those conditions and didn't go transonic until 2k. The 212gr and 220gr ELDX should do well on any elk you encounter. I was still pushing 1000ft-lbs + of energy out to about 1400 yards with the 220's. Not sure how the 212gr stack up.
     
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    PRCdude

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    OCW results with new lapua brass. Definitely looks promising. As stated in other posts, necks were extremely tight. Initially ran thru .307 mandrel and seating pressure was over 100 psi. Then ran some .308 mandrel and got seating preasure in the 40-60 psi range.

    All charge weights were 3 shots, except 78.2 where I was warming up the barrel.

    300 PRC.png
     
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    solocam

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    Is there such a thing as a factory production rifle that will magazine feed anything heavier than 212’s? I really like the idea of being able to shoot up to 240g bullets. From a hunters perspective I don’t think this cartridge will take off the way the 300WM has unless you can magazine feed it. Hope I’m wrong though?
     

    Rocketmandb

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    OCW results with new lapua brass. Definitely looks promising. As stated in other posts, necks were extremely tight. Initially ran thru .307 mandrel and seating pressure was over 100 psi. Then ran some .308 mandrel and got seating preasure in the 40-60 psi range.

    All charge weights were 3 shots, except 78.2 where I was warming up the barrel.

    View attachment 7641286
    What chart type is that?
     

    6.5SH

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    themightytimmah

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    Is there such a thing as a factory production rifle that will magazine feed anything heavier than 212’s? I really like the idea of being able to shoot up to 240g bullets. From a hunters perspective I don’t think this cartridge will take off the way the 300WM has unless you can magazine feed it. Hope I’m wrong though?
    The Bergaras come with CIP length mags, you can load up to 3.750. I have 250 A-Tips running in an identical magazine setup, mag length is .050 off the lands in my rifle.

    Could jam into the lands at mag length with 210 Bergers, the ogive on the A-Tips is just a little too long and slippery.
     
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    gnochi

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    Any idea why they dropped the AICS mags in the new rifle lineup?
    That is an AICS “standard” (such as it exists), specifically the “CIP” length variation. The big reason is the additional fraction of an inch of cartridge that fits into the magazine.
     

    b2lee

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    I've been seeing a LOT of Hornady 300PRC Match ammo in retail stores lately. Not my thing...but things are looking up for you guys that shoot retail stuff. Before the fall of the year....you should see a ton of Berger hunting ammo for 300PRC. Look for Lapua brass, Federal Primers, VV powder, and atleast 3 options on bullets...including the 245gr EOL in their hunting line.

    When that happens.....save your Lapua brass...there will always be people looking to buy some once fired.
     

    Luvman

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    I've been seeing a LOT of Hornady 300PRC Match ammo in retail stores lately. Not my thing...but things are looking up for you guys that shoot retail stuff. Before the fall of the year....you should see a ton of Berger hunting ammo for 300PRC. Look for Lapua brass, Federal Primers, VV powder, and atleast 3 options on bullets...including the 245gr EOL in their hunting line.

    When that happens.....save your Lapua brass...there will always be people looking to buy some once fired.
    I need my action to come in first!
     

    LongRangeAggie

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    1624483327700.png
     

    96C

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    SEATING DEPTH with 230gr A-Tips.
    What CBTO and jump did you find worked best for your rifle?

    I have loaded up 5 different CBTO groups of 6, at the same charge weight (seems fairly happy at 2847fps) for testing this weekend.

    AXSR with Proof prefit carbon 1:8" barrel, 26".
    The SAAMI load is around .150", it's shooting OK, but could definitely be better.
    Hoping to get some good groups going with these test rounds.

    Keen to hear your about your experiences.
     

    m1ajunkie

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    SEATING DEPTH with 230gr A-Tips.
    What CBTO and jump did you find worked best for your rifle?

    I have loaded up 5 different CBTO groups of 6, at the same charge weight (seems fairly happy at 2847fps) for testing this weekend.

    AXSR with Proof prefit carbon 1:8" barrel, 26".
    The SAAMI load is around .150", it's shooting OK, but could definitely be better.
    Hoping to get some good groups going with these test rounds.

    Keen to hear your about your experiences.

    I'm at .082" jump.... 2.880" base to ogive on a loaded round. Running an average of 2935 fps out of my Ruger precision rifle.
     
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    96C

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    896B0F83-70B8-477D-9CB8-7767097EB583.jpeg
    1454F893-0494-4972-A2F6-C02576A3F6E4.jpeg
    31BC50A2-F654-4EC1-98C4-6BD5DCA0DC16.jpeg
    A1220CE8-4C2F-493E-960D-551D1EFABEBC.jpeg


    Seating depth, jump tests from 0.150”, 0.135”, 0.100”, 0.080” and 0.060”.

    0.135” is good, might load some more up with minor tweaks up and down. 0.130” & 0.140” perhaps.

    230gr ATips
    ADG brass
    215GM primers
    ADI AR2225 powder
    1:8” 26” barrel
    2847fps

    Barrel only has 110 rounds through it so far, going alright.
     

    bunny too

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    View attachment 7657703View attachment 7657704View attachment 7657705View attachment 7657706

    Seating depth, jump tests from 0.150”, 0.135”, 0.100”, 0.080” and 0.060”.

    0.135” is good, might load some more up with minor tweaks up and down. 0.130” & 0.140” perhaps.

    230gr ATips
    ADG brass
    215GM primers
    ADI AR2225 powder
    1:8” 26” barrel
    2847fps

    Barrel only has 110 rounds through it so far, going alright.
    I was very surprised, when I adjusted my seating depth from .125 to .1" my velocity dropped from 2925 to 2876fps. Good grouping!
     
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    96C

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    I was very surprised, when I adjusted my seating depth from .125 to .1" my velocity dropped from 2925 to 2876fps. Good grouping!
    Will have to re-chrono it now the seating depth and charge have been decided... That's a big drop in MV... Strange.
     
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    bunny too

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    Will have to re-chrono it now the seating depth and charge have been decided... That's a big drop in MV... Strange.
    Yes! I was shocked. Below is my dope

    Lapua brass
    215 GM
    230gr A-tip
    77.5gr H1000
    2925fps
    28" 1-9 twist.
     
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    TripleBull

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    Is there such a thing as a factory production rifle that will magazine feed anything heavier than 212’s? I really like the idea of being able to shoot up to 240g bullets. From a hunters perspective I don’t think this cartridge will take off the way the 300WM has unless you can magazine feed it. Hope I’m wrong though?

    I'm extrapolating between what I've seen and what I know. I've seen an AI AX-SR in 300 PRC at Mile High and also see one on Mile High's website. So I assume it's now a factory option. I bought an AX-MC in 338LM, then bought a Bartlein barrel in 300 PRC, a 300 WM bolt and 300WM magazine. I've shot it with Hornady factory ammo with 225 ELDMs and handloads with 230 grain A-Tips. No problems. You'd need to look at the factory AX-SR specs, check the magazine, etc. And bring your wallet. Maybe 2 wallets. Anybody seen my wallet?
     
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    Bandit320

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    I have an Howa 1500 that will feed hand loads i use (loaded to a bit longer then 3.7”) out of the internal box magazine. Oryx makes the chsssis for it that takes 3.850” magazines but you have to machine the bottom of the receiver for those to fit.
     
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    solocam

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    Does anyone have the neck diameter measurement of a loaded round in Lapua brass for the.300PRC? Looking at ordering a custom honed die. Thanks