Reloading the 6.5 Creddmoor for my RPR... (2)

[MWalker]

My first post here.
I have had great results with my RPR shooting 130 grain Sierra MK PTBT, seated at 0.015" off the lands, using 47.5 grains of Superformance with CCI200 primers.
On 10/19/2016 at Logan county fish and Game in Bellefontaine, Ohio I attained a 5 shot 300 yard group that measured 0.84".
Would like to post a photo, but have not uploaded it to photo bucket yet.

I should have mentioned that my Magnetech reports an average of 2995 fps, highest was 3003 fps.
Also this was with a cool, sparkling clean barrel.
As the barrel heated up, a diagonal string going from center to say 4 o'clock.
After the 10th round the group opened up considerably.
After that I went home happy, but made a barrel cooler with a battery powered Coleman 4D quick pump from WalMart costing $17.97, and a length of brass tubing from ACE Hardware.
More volume of air and cheaper than the "official" barrel coolers.


 

[BERGEON]

As far as my 'magic' load in the RPR...
  I am finding a great load at 42.3gr H4350, CCI BR-2 primer, Cauterucio 141.5gr VLD at 0.015" off the lands.  Velocity avg 2748 fps. 
(top right target is 42.3 3 shot groups at 100yds)

Hello,
I test this weekend the H4350 at 328 yards , 44 gr H4350 + LAPUA Scenar +Norma Case +RWS +5341(COAL 2.82'')
Why very good accuracy for a FACTORY  gun! (H 0.98'' L1.77'')
But I don't know the speed of this load! I haven't got "Quickload" can you help me please?



A+
Laurent.

[rardoin]

Laurent, I don't think you can count on Quickload to predict velocity unless you have all the parameters for your gun/powder burn rate (varies from lot to lot)/case volume etc.  However, a more accurate 'guess' could be made from the elevation correction required between 100 and 300 meters no wind zero.  The ballistic coefficient of the 139gr Scenar is known...just need to plug in the correction required between 110 and 300 meters into a ballistic solver to get a close estimate of velocity.  To get Quickloads predictions to correlate with my actual results requires a lot of fine tuning to my particular rifle/cases/powder and I don't think I could reliably estimate a velocity for your system.  Do you know the 'come up' required to go from a 100 meter zero to 300 meters?

Robin

[BERGEON]

Laurent, I don't think you can count on Quickload to predict velocity unless you have all the parameters for your gun/powder burn rate (varies from lot to lot)/case volume etc.  However, a more accurate 'guess' could be made from the elevation correction required between 100 and 300 meters no wind zero.  The ballistic coefficient of the 139gr Scenar is known...just need to plug in the correction required between 110 and 300 meters into a ballistic solver to get a close estimate of velocity.  To get Quickloads predictions to correlate with my actual results requires a lot of fine tuning to my particular rifle/cases/powder and I don't think I could reliably estimate a velocity for your system.  Do you know the 'come up' required to go from a 100 meter zero to 300 meters?

Robin

Hi Robin, thank you for your reply!

I'm sorry but all my loads in H4350 have been directly developed at 300m so I don't know my "come up" required to go from à 100 m zero to 300 m!

But I will have a solution that I like expose you for confirmation...

I Know the velocity of another load : 44 gr N160 (2726ft/s) with same componants and I know the correction at 300m to as my loads of H4350 and N160 :
- exactly ¾ MOA @ 300 m = 6.56 cm  or 2.58''

I run my Sierra Infinity V6 select LAPUA Scenar 139 gr, and with an zero at 100 metter and 831m/s (2726ft/s) , I have a Drop =  36.45 cm (14.35'') @300m for my load of 44 gr N160!

So for my load of 44 gr H4350  in Sierra Infinity V6, I increase the velocity until to have a minor Drop : 36.45 cm - 6.56 = 29.89 cm or 11.76'' Drop @300m.

I found a velocity for my load of 44 gr H4350 of 889m/s (2916 ft/s)

Robin is it credible to have a velocity of 2916 ft/s with 44 gr H4350 + LAPUA Scenar139 gr in my RPR?
Or where is my mistake? (Sorry for my poor English) 

A+
Laurent.

[dadajack]

Robin is it credible to have a velocity of 2916 ft/s with 44 gr H4350 + LAPUA Scenar139 gr in my RPR?
Or where is my mistake? (Sorry for my poor English) 

A+
Laurent.

It certainly is possible, but you have to be HAMMERING your brass like crazy. I've pushed a 140 grain projectile to 2870 with Hybrid 100V before, but I got some light ejector marks, and was pretty confident the load was exceeding safe operating pressures. Regardless of my experiences, you might be able to push them that hard, especially with the understanding I am not aware of your OAL. I loaded the 140 to 2.815" in my rifle, which is not much longer than minimum, so I expected to get high pressures with max book charges. Keep an eye on your primer pockets with that load. 44 grains of H4350 behind a 140 class bullet is a stout load.

[rardoin]

I agree with Dadajack, if you are getting that velocity with a 140 (which is possible with that charge weight) you are hitting the brass really hard.  But, if you do not have difficult extraction, the primer pockets are holding primers firm and are minimizing the sizing of the brass you may be just fine if a reduced case life is acceptable.

[BERGEON]

It certainly is possible, but you have to be HAMMERING your brass like crazy. I've pushed a 140 grain projectile to 2870 with Hybrid 100V before, but I got some light ejector marks, and was pretty confident the load was exceeding safe operating pressures. Regardless of my experiences, you might be able to push them that hard, especially with the understanding I am not aware of your OAL. I loaded the 140 to 2.815" in my rifle, which is not much longer than minimum, so I expected to get high pressures with max book charges. Keep an eye on your primer pockets with that load. 44 grains of H4350 behind a 140 class bullet is a stout load.

I agree with Dadajack, if you are getting that velocity with a 140 (which is possible with that charge weight) you are hitting the brass really hard.  But, if you do not have difficult extraction, the primer pockets are holding primers firm and are minimizing the sizing of the brass you may be just fine if a reduced case life is acceptable.

I'm really not sure of the veracity of my ballistic calculation to estimate the velocity of my charges of 44 gr of H4350, I think sincerely that it is overrated because I have no sign of overpressure and my primer Pocket are right! (I tested 44.2 gr H4350 it's good too!)

That's why I will want to get an estimate of my speed by Quick load... (COAL : 2.820'', Norma Case, RWS 5341, LAPUA scénar 139 gr, 44 gr h4350)
I read this topic in another forum , it's confirm my overrated velocity ...

Some more data that I got from other forum
6.5 Creedmoor load over 139 Lapua
H4350:
42.1.....2534
42.6.....2594, 2588, 2578
43.1.....2624
43.6.....2661
Notes: No pressure seen.
H4350: (decided to continue up to see where pressure is seen)
44.....2745
44.5.....2766
45.....2772
45.5.....2783
Notes: No pressure seen. 45, and 45.5 were compressed loads. Also the same two were through the same hole.

http://65creedmoor.com/index.php?topic=4.0

Pleasure to read you.

A+
Laurent.

[AFraser]

Bergeon
Have you considered RS60 (Reload Swiss)? 
It is a high energy powder that gets you either higher velocity at the same pressure as H4350, or the same velocity at lower pressure.
I use it with 139 Scenars and it delivers very consistent velocities.

[Cold Trigger Finger]

Bergeon ; its great reading about your 6.5 Creedmoor shooting and reloading adventures.  ! . 44.2 grains of H 4350 is ALot of powder in a 140gr class bullet. I max out at 43.3 grains of H 4350.
 Strange , the international commerce laws , I  can get Ramshot Hunter here in Alaska but it is not available in France ?. If I remember correctly,  Jon Barsness had good accuracy and velocity with that powder in the 6.5 Creedmoor. 
 Tho I have an Shooters Chrony,  everyone here tells me I need a Magneto Speed.  And  I agree with them .

[BERGEON]

Bergeon
Have you considered RS60 (Reload Swiss)? 
It is a high energy powder that gets you either higher velocity at the same pressure as H4350, or the same velocity at lower pressure.
I use it with 139 Scenars and it delivers very consistent velocities.

Yes i triey the RS60 (the same Swiss factory macker that RL17  )in my RPR, but I stop to use this "double base" beacause I have a bad accuracy whith my LAPUA Scenar 139 gr
(2789 ft/s)

I use now the RS62 (single base) with a better accuracy with LAPUA 139 gr    :
(sorry I don't know the volocity!)

A+
Laurent

[BERGEON]

Bergeon ; its great reading about your 6.5 Creedmoor shooting and reloading adventures.  ! . 44.2 grains of H 4350 is ALot of powder in a 140gr class bullet. I max out at 43.3 grains of H 4350.
 Strange , the international commerce laws , I  can get Ramshot Hunter here in Alaska but it is not available in France ?. If I remember correctly,  Jon Barsness had good accuracy and velocity with that powder in the 6.5 Creedmoor. 
 Tho I have an Shooters Chrony,  everyone here tells me I need a Magneto Speed.  And  I agree with them .

I'll be able to measure the velocity of my 44 gr H4350 with my crono PACT N°1   

I phone a Belgium gunsmith to buy the RAMSHOT Hunter, I learned the Ramshot powder isn't available in Belgium because there is a forbiden element in the composition of the Hunter in the European Community. The old  stock of Hunter it was destroyed and a new formula has been developed but is approval by Western Powder for the American market... And we do not know when the new production will be put up for sale after this approval 2 months or a year...
But the good news is that my Belgian gunsmith found me two cans of old powder Hunter !

For my RPR I have 3 loads we works well at 300 m with a good accuracy in my RPR ant the strange thing it's the same load  44gr wyth thoses 3 powders !!!





A+
Laurent.

[AFraser]

Bergeon
For what it's worth, my accuracy node with RS60 and the 139 scenars came a little higher, at ~42.6gr.

[BERGEON]

Bergeon
For what it's worth, my accuracy node with RS60 and the 139 scenars came a little higher, at ~42.6gr.

I have this not very good accuracy at 328 yards, with 42.5 gr RS60 (The X measured 1.96'')
(V0= 2834ft/s)


And this same load  (42.5 RS 60 with the LAPUA Scenar 136 gr "L") give this accuracy (not good for me!) at 656 yards (The black visuel measured 15.74''diameter ,and the X 3.15'' diameter )


A+
Laurent.

[AFraser]

Fair enough Bergeon - you've done your homework!

[BERGEON]

Hello guys, Sorry to disturb you! I have an ejection problem with my new cases HORNADY in my RPR, they fall into my ejection window and I have to pull out them with my right finger ! While with NORMA 6.5CM and LAPUA (. 22-250 REM) cases, I haven't ejection problems !!! Have already meet you this ejection problem with Hornady cases (lot # 4160138)years has a RPR bolt?