RPR 6mm Creedmoor freebore?

[Dgd6mm]

Has any body who is having this problem called Ruger? I would think they'd take the rifle back under warranty if it won't chamber factory ammo.

Yes fatelvis states he called them in post #7

 

[MattS]

I recently picked up a Gen2 RPR also in 6creedmoor. Just set up 105 hybrids to touch with the Wheeler method, compared to factory Hornady 108 eld’s My rifle shows .016” jam with the Hornady ammo.

Just loaded up a ladder with RL16 39-43.5 in .5gr increments, hope to test in the next few weeks.

 

[dnellans]

interesting to hear another rpr user with virtually identical symptoms.

43.5 of rl16 gonna be smoking hot, that’s way over max values i’ve seen. be careful working up, from my testing that high would put me over well over 3200fps with a 24 inch barrel. interested to hear where you arrive for final load

 

[MattS]

interesting to hear another rpr user with virtually identical symptoms.

43.5 of rl16 gonna be smoking hot, that’s way over max values i’ve seen. be careful working up, from my testing that high would put me over well over 3200fps with a 24 inch barrel. interested to hear where you arrive for final load

Yes 43.5 should be way to HOT but I’ve made the mistake a couple of times taking a ladder test to the range and not finding max pressure.

Great thing is you don’t have to shoot the high charges if the rifle is showing pressure signs early.

 

[dnellans]

just checking back in here - i decided to run a tubb final finish kit through my ruger since the lands moving out was desired in my case. i found they moved substantially, .040-.045 ish. i can now at least seat a 105 hybrid at 2.70 and just be on the lands.

did a little load work up today afterwards and gun put down a couple .5 three shot groups. that at least gives me something to work with and see if i can get it under .5 for 5x5 groups with a little more fine tuning. considering i couldn’t get a group under .75 and most above 1 this is a pretty significant improvement. i don’t like the amount of shift in the groups but at least the’re getting smaller!

not sure i’d want to use the tubb system on a gun if i didn’t know where the lands were, but in this case i’ll claim “it worked”

workup attached just for ref (nosler rdf’s still shoot for shit)

 

[fatelvis]

I like to finally see actual, confirmed results, concerning the final finish kit. I’m glad to see it improve the accuracy, and versatility of your rifle. Sometimes a gamble pays off!

 

[Rob01]

I like to finally see actual, confirmed results, concerning the final finish kit. I’m glad to see it improve the accuracy, and versatility of your rifle. Sometimes a gamble pays off!

Here's my review of the FF and TMS.
http://teamblaster.net/reviews/TubbFFTMS.pdf

 

[fatelvis]

Just finished loading and shooting the entire Final Finish Kit. As a previous user found, one must be careful while loading these, to insure they are all the same caliber coated bullets. Check out the attached pic, and see if the bad round jumps out at you. I sure hope it does! Lol It turned out to be a 6.5mm bullet included as one of the #3 grit bullets.

 

[dnellans]

Thats crazy - thats quite the f*ck up by tubb. Glad you noticed it upon seating at least!

 

[fatelvis]

Thats crazy - thats quite the f*ck up by tubb. Glad you noticed it upon seating at least!

Oh it was immediately apparent something was wrong when seating. The resistance on the press handle made me stop immediately. It did, however, seat the bullet about 1/8” into the case. I guess I can give an “attaboy” to Forster’s BR seating die. It will align and seat anything you put in it. I’m tempted to put that round on my case spinner and check concentricity! Lol

 

[dnellans]

A mere 21 thou neck tension as they say! =)

 

[Dusty Stevens]

Ive seen bullets in the box mixed in with a few wrong calibers. Sure makes you laugh when people talk about lot numbers and worrying about that.

 

[MattS]

Finally got out for the ladder test today. Temp was 86f wind gusting right to left 7-15mph.

Rifle had only 5rds on it before ladder test and new Lapua 6.5 brass necked down for the 6.

My biggest surprise was 43.5grs RL16 had no hard bolt lift or sticky extraction (this is in my RPR please use caution) Slight primer cratering but still has rounded edges.

Sorry no velocity data as my MagnetoSpeed is loaned out to a friend currently. My guess is #5-6 is in the 2960 area seeing I put .8mils up on the 100yd zero and Ballistic AE has that for the factory Hornady ammo with 108eld

Please correct me if my conclusion is incorrect...42.5grs seating depth ladder is my next test. Thinking about .010 through .040 @ .005 change 3rds per seating depth.

 

[dnellans]

For speed reference - I'm using H4350 rather than RL-16 now but did start with RL-16 and here is what I was seeing with 105 hybrids.

40.6gr - 2999 FPS
41.1gr - 3050 FPS
41.6gr - 3104 FPS

@ 43.5 grains - my guess is you're pushing 3250-3350 FPS.

With H4350 over any of the 105 hybrids, 105 RDFs, or 107 SMKs

41.7gr - 3050FPS

 

[dnellans]

A little update on getting to a load for my 6 RPR. Got out to shoot what I was hoping would be a fine window and seating depth test based on the 3 shot groups posted above.

No happy at all that there is such a big change in group size with both seating depth and .1 gr charge weights. while there are 2 reasonable groups at 41.7, it certainly doesn't inspire confidence with vastly bigger groups both above and below it. Scratching my head a bit... Looking back at the 3 shot groups that indicated 41.7 might be a good spot, seeing all the vertical shift makes me think i might need to look a little higher in charge weight still. Or, it could be the fact I still have to seat them fairly far back to get off the lands at 2.70-ish.



Also attaching a 6.5 CM (also RPR) workup from the same day where its very obvious that one seating depth is the best across .3 gr charge weight and even changing the seating depth doesn't dramatically balloon the group sizes to 1.4MOA like it seems to with the 6mm.

 

[Zero333]

Your RPR doesn't like those powders.

Try H-4831sc.
H-4831 / H-4831sc "might" sacrifice a little speed, but you will not regret trying it. Go with 210m primers over BR2.

Go from 42.5 to 45 gr of H-4831sc with 105-107's

Thank me later.

 

[dnellans]

Does 4831 have a higher fill density than 4350 or RL-16? In my starline brass I start getting a compressed load at just about 43.5 grains just playing with either of those. thinking about jamming 45 in there seems impossible unless it can do it in the same volume.

 

[fatelvis]

Finally got out for the ladder test today. Temp was 86f wind gusting right to left 7-15mph.

Rifle had only 5rds on it before ladder test and new Lapua 6.5 brass necked down for the 6.

My biggest surprise was 43.5grs RL16 had no hard bolt lift or sticky extraction (this is in my RPR please use caution) Slight primer cratering but still has rounded edges.

Sorry no velocity data as my MagnetoSpeed is loaned out to a friend currently. My guess is #5-6 is in the 2960 area seeing I put .8mils up on the 100yd zero and Ballistic AE has that for the factory Hornady ammo with 108eld

Please correct me if my conclusion is incorrect...42.5grs seating depth ladder is my next test. Thinking about .010 through .040 @ .005 change 3rds per seating depth.

Matt, I would be careful with that 43.5 load. According to Quickload, you should be running at 74,347psi (almost 13,000psi over max) and should be yielding 3,231fps out of a 24" barrel, using a COAL of 2.8". Using 42.5 grns still has you running about 7,000psi over max.
Just wanted to give you a heads up...

 

[MattS]

Matt, I would be careful with that 43.5 load. According to Quickload, you should be running at 74,347psi (almost 13,000psi over max) and should be yielding 3,231fps out of a 24" barrel, using a COAL of 2.8". Using 42.5 grns still has you running about 7,000psi over max.
Just wanted to give you a heads up...

Thank you for the info! Didn’t plan to run anywhere close to that for final load just was checking my max pressure area, did not want to settle on a lower charge weight and be close to my rifles max. I’m going to test 41.5-42.5 for final load.

 

[RPR 6.5 slave]

I just measured my RPR's throat last night and found that Hornady's 108 ELD match ammo is jamming into the lands .16"!! (Not .016"). I checked it 3 times, because I thought for sure that Ruger and Hornady MUST HAVE teamed up and compared notes on dimensions, when developing the 6mm Creed. Do you think this is something that I should just load accordingly for, or should I send my rifle back to Ruger for a reaming?

I too recently purchased a RPR Gen 2 6mm creedmoor and I am having the same issues. I used factory Hornady Black 105 bthp for barrel break in and they are seating into the lands. Tried 108 ELD_m and they are touching the lands at 2.632 coal. 2.083 @ Ogive. I have contacted Ruger and have yet to hear back from them. I have a RPR 6.5 gen 2 That I have had no issues with. I spoke to another shooter that said he also found issues with RPR recently.