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300 PRC update
- Thread starter DAVETOOLEY
- Start date
I'm working with the ADG right now. I am using a mitutoyo micrometer to take these measurements.
Out of the box the brass measures at .3365, I sized them with a .335 bushing, which resulted in.3355 due to spring back. Seated with a 230gr A-tip it measures at .338. So I think a .336 busing would be perfect. But I am gonna see how this shoots for now. I also mag feed so I like having at least .002 of tension.
I already ran my new brass through the bushing, so without a bullet it measures 0.3366.
0.3377 - 0.3366 = .0011 neck tension.
The way I look at it is that I want as little as possible without the possibility of the bullet getting pushed in by accident either in transport or by recoil in the magazine.
If I can push the bullet in by pressing the tip down on a hard surface it's not enough tension.
If you are treating each round with the utmost care and hand feeding each one then you can get away with less.
More tension equals more pressure and friction which adds more variables to your load equation.
.002 seems to be the norm.
You spelled 'the$e' wrong
$$$$ but yea...I have one of those on the way for 300PRC. Which force pack you using?
I'm using the standard force packYou spelled 'the$e' wrong
You spelled 'the$e' wrong
It's actually not that bad on the wallet - at least the K&M isn't. I just started using my new 300 PRC seater with mine and love it. As an aside, the ADG brass was remarkably consistent. I used an expander to open the necks up, then resized them. The out-of-the-box neck tension is extremely high.
what expander did you use?
Also using whidden dies I am getting basically no run-out on loaded ammo with the ADG brass. Quite happy, can't wait to shoot it.
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I use the same one for my K&M neck turner (which it seems I have no need for any more in .30)
ADG has 300 PRC brass in stock on there website. Half of is already gone, looks like 130 cases left.
Yea...I couldn't believe how tight they were out of the box.....I'll see how the .336 does...I may go to .337...but we'll see.
yeah kinda annoying for how much they cost TBH.... I would rather just have them loose so I can size it.
It's not a bad idea to give a light turn to brass. If there is a thick side, you knock it down and improve consistency for the bushing/mandrell approach.
I’m bored in a zoom meeting and got the text that my rifle is shipping tomorrow so here’s some glamour shots for yall
^needs some Walmart camo spray paint on it....
I’ve been trying to get a new build sorted out and have been chasing my tail a bit.... curious if anyone loading with n565 have notices it to foul quickly? After about 50 rnds mine starts scatter grouping, clean it ( notice more carbon fouling than any other setup I’ve had ) and groups come back. Took me a minute to figure this out as I never had a solid load and have been doing development. I also noticed that the 230 A-tips I’m working with are extremely jump sensitive , I mean a .015 window from .020 - .045 is all it will work with.... and yes I ran a jump test in .030 increments from .010-..130.
Build spec
Bighorn SR3 with origin bolt to get .260 pin fall
Proof savage prefit
Manners EH-1 pillar bedded (.002) stress
NX8 4-32
Build spec
Bighorn SR3 with origin bolt to get .260 pin fall
Proof savage prefit
Manners EH-1 pillar bedded (.002) stress
NX8 4-32
what are you loading those 230 A-Tips COAL? I loaded mine to where they would fit in a CIP mag...maybe I got lucky and it was the magic length for me in my chamber.
I run N565 mostly...like it better than Retumbo and still trying to find a perfect load in RL-26. I haven't found it to be too dirty...I shot about 90 rounds the other week and it didn't seem to change from shot #1 to shot number whatever I ended with.
The A-Tips for me at a mile make me giggle...they make me look a lot better than I am.
I run N565 mostly...like it better than Retumbo and still trying to find a perfect load in RL-26. I haven't found it to be too dirty...I shot about 90 rounds the other week and it didn't seem to change from shot #1 to shot number whatever I ended with.
The A-Tips for me at a mile make me giggle...they make me look a lot better than I am.
I’m running a wyatts box so COAL is not an issue for me. 3.795 is .040 off in my rifle
If you haven't...try Ramshot Magnum....cleanest powder I have ran thru the prc to date...
Just left range...and was pretty please with it...first time out with it...did some load testing with it...and at first I was like this stuff sucks because it wasn't where the H1k was but then as I climbed up the latter it got surprisingly good and I'm glad I didn't give up on it...I have 2 other powders to try out...but as of right now I would call ramshot my new favorite...
Just left range...and was pretty please with it...first time out with it...did some load testing with it...and at first I was like this stuff sucks because it wasn't where the H1k was but then as I climbed up the latter it got surprisingly good and I'm glad I didn't give up on it...I have 2 other powders to try out...but as of right now I would call ramshot my new favorite...
Just wondering what mag are you using? I have the MDT CIP Length, had to bend the feed lips a little to get it to run. Seems okay now.
Regardless I am also loading to CIP length with the 300 PRC, it is quite far from the lands but in my experince I find that shoots fine.
I use the same MDT 300WM CIP mags. Yea...I bought an MPA Feed Lips Tool....adjusted them to the right height for my action....bought more on Black Friday Sale when they were more reasonably priced. I have one AI 338LM mag that I adjusted the feed lips on but I don't like it as much.....well...I like that it has less spring force than the MDT>..which I think are way too tight when new.....but I don't like the squared off follower that locks your bolt from going forward.
So...I dry fire and do a full bolt cycle with the MDT Mag.....but if I'm shooting a 10 shot stage with a 300 PRC....which doesn't happen...but let's suppose....I'll use the AI mag on the first 5 so that when I'm out I can't push the bolt forward...and then the MDT mag to finish off the stage.
However, I like to shoot some ELR single feed stuff...and with the MDT mag I can just place the round on top of the mag and run the bolt forward...with the AI...I have to press it down into the mag to start the cycle.
Wow...that was long winded..can you tell I'm bouncing off the walls with no place to go shoot and work off some energy?
Should be getting y’all some short barrel data soon.
Was using 215 begers today...the mid 2700s is what my 24" MPA berral likes...9 twist...
I was really out just checking how the 215s compared to the 225 ELDs in velocity and if the barrel liked them any better for higher velocity and it...doesn't...
I am going to stick with the 225 ELDs or the 230 A tips...barrel likes either of those at mid 2700s as well...
As far as the ramshot goes....it is slower in velocity than H1K... around 100 fps slower per same measured charge...
I did a side by side grain per grain comparison between the two powders...between 2700-2800 fps because for 1 I wanted to see for myself and 2 because I had no data on ramshot magnum...
77.3 grains of ramshot was getting me 2760s with no pressure sign what so ever....
The barrel seemed to like it tho..I was happy with the results on paper...but very clean burning....much cleaner than H1k
For my barrel...if I had to pick one or the other it would be ramshot at this point...
Will be working on Norma magnum powder and 7828 SSC in the near future and will post details on those when can...
It’s about 12.5 lbs as you see it with an unloaded mag. It weighed just over 9 lbs bare. Not the lightest but not too bad.
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Just shot the 300 PRC today. I am excited. Factory 225 ELD pushing 2840fps.
78gr of Retumbo in ADG brass topped with a 230 ATip is pushing 2860. No pressure signs.
Barrel has 30 rounds on it so I expect some speed up. Groupings at 100 yard came out okay I think...
78gr of Retumbo in ADG brass topped with a 230 ATip is pushing 2860. No pressure signs.
Barrel has 30 rounds on it so I expect some speed up. Groupings at 100 yard came out okay I think...
Attachments
We need pics of that rifle with the 37" barrel. Whole Lotta LoveMy first barrel was 30" and I have no real complaints other than the awkwardness of moving the longer barrel around (cases, vehicles, etc..). I was getting 2940fps with 230's a grain under max published book charge, probably could've swung 3000.
Currently I have a 37" Bartlein MTU. Getting 2934fps with 250 A-tips with book max charge of Retumbo.
Or..... You can run ADG brass at 80ksi with a 28" barrel and get the same speed
ADG Brass - Unknown Munitions
6UM Brass is expected to run in August, it will be 6UM head stamp but will still need to be fireformed. ADG brass was designed not only for consistency, but for durability. One of the ways we accomplished this was adding material to the case in specific areas to strengthen it. With the...
www.unknownmunitions.com
Looks like they have 300 PRC brass in stock, 22 boxes left!
Was chronoing some loads yesterday in the 27" AXMC Tooley barrel. Virgin ADG brass. RL26, CCI250 primers. 215 bergers seated at the lands at 3.702 coal. Ammo was 75 degrees when shot. Just a data set and nothing else. Just was looking for pressure in this new barrel.
RL26--FPS
74.4---2907
74.7---2942
75.0---2949
75.3---2940
75.6---2988
75.9---2996
76.2---3012
76.5---3015
76.8---3020
77.1---3046
77.4---3046. Very very small ejector mark. Had to look hard to see it. No hard bolt, or flattened primer.
Should have loaded more on the top end to 78 to see when I got more pressure for the test but didn't load them to test out. Loaded up a test pack last night to shoot for accuracy testing with various loads between 75-77.2gr.
RL26--FPS
74.4---2907
74.7---2942
75.0---2949
75.3---2940
75.6---2988
75.9---2996
76.2---3012
76.5---3015
76.8---3020
77.1---3046
77.4---3046. Very very small ejector mark. Had to look hard to see it. No hard bolt, or flattened primer.
Should have loaded more on the top end to 78 to see when I got more pressure for the test but didn't load them to test out. Loaded up a test pack last night to shoot for accuracy testing with various loads between 75-77.2gr.
Has anyone tried these 241’s yet from Patriot Valley?
I don’t have reloading equipment but I’m going to have someone do it for me,having Josh from PVA build me a 300 PRC with a 7tw he suggested the 241’s but I can’t reload. Here’s the link
Really nice, but requires a 7 twist.
More streamlined design and copper being longer for a similar weight than lead core jacketed projectiles.
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