New to us Rem 700 SPS in 25 Whelen

[FOTIS]

Via 240 Bee. 90 gr AB at 3510 fps

 

[35 Whelen]

How far Fotis?

 

[35 Whelen]

jBack out again today with Chronograph, the readings blew
Me aways even though we do have a 24" barrel, the avg vel
With 53.5 grs 4831sc was 3240 fps here is the grouping

 

[35 Whelen]

But this was the one that got me, PPU case, CcI mag primer, 57 gr of RL 25, 117gr SST, here is the actual vel
Of that load, ??? Is this not 257 Weatherbee stuff???

Two shots raised the turret a few clicks and two more from this load.
I am now wondering if those loads I posted with RL 25 and 100gr bullets over 3600fps
May actually be true??

 

[FOTIS]

How far Fotis?

15 feet I have a witness! :mrgreen: :mrgreen: :mrgreen:

 

[JD338]

Earle,

Nice shooting. Give Retumbo a try with the Hornady 117 gr SST.
It should get you where you want to be.

JD338

 

[FOTIS]

Either your chrony is off or your pressures are astronomical. Anything over 3100-3200 is crazy.

 

[FOTIS]

Cartridge          : .25-06 Rem.
Bullet             : .257, 117, Hornady SST InterLock 25522
Useable Case Capaci: 60.162 grain H2O = 3.906 cm³
Cartridge O.A.L. L6: 3.250 inch = 82.55 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-25

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-20.0   83    45.60   2447    1556   28170  10495     92.6    1.595
-18.0   85    46.74   2512    1639   30098  10841     94.0    1.555
-16.0   87    47.88   2577    1725   32163  11167     95.3    1.516
-14.0   89    49.02   2642    1814   34378  11471     96.4    1.478
-12.0   91    50.16   2708    1905   36751  11752     97.4    1.441
-10.0   93    51.30   2773    1997   39297  12006     98.3    1.395
-08.0   95    52.44   2838    2092   42032  12231     99.0    1.350
-06.0   97    53.58   2902    2188   44968  12426     99.5    1.308
-04.0   99    54.72   2966    2286   48126  12590     99.8    1.267
-02.0  101    55.86   3030    2385   51527  12720    100.0    1.228
+00.0  103    57.00   3093    2485   55191  12820    100.0    1.190
+02.0  105    58.14   3155    2585   59142  12912    100.0    1.153  ! Near Maximum !
+04.0  107    59.28   3216    2687   63408  13000    100.0    1.118  ! Near Maximum !
+06.0  110    60.42   3277    2790   68019  13084    100.0    1.084  !DANGEROUS LOAD-DO NOT USE!
+08.0  112    61.56   3337    2893   73015  13163    100.0    1.051  !DANGEROUS LOAD-DO NOT USE!
+10.0  114    62.70   3397    2998   78430  13237    100.0    1.019  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba    103    57.00   3231    2712   68245  12308    100.0    1.092  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    103    57.00   2883    2160   44125  12941     96.7    1.316

 

[SJB358]

Yeah, I'd have to agree with Fotis, about 3200 would be the ceiling. I'd suspect you'd notice something as far as PSI signs at 3400+.

Looks like it's shooting relatively well though. Shouldn't be long before it'll be tearing up the yotes

 

[FOTIS]

Chrony FULLY OPENED? I done that before.

 

[DrMike]

Excellent point, Fotis. I believe all of us have made that mistake at least once. A little ice can play havoc with fully opening the Chrony.

 

[FOTIS]

Oh yes. 308 Norma magnum launching 200 gr partitons at 3200 fps from a 22 inch tube!

 

[35 Whelen]

Yea,
Seamed crazy high to me as well, chrono was opened all the way, these loads appear to show zero signs of high
Preasures.......... no sticky bolt lift, raise it with one finger,no flattening of primers...... RL 25 does sound louder,
Kick harder, and not group as well and seamed to consistantly show 175fps more vel???
Sounds like maybe the chrony has gone nuts?

 

[SJB358]

It's probably just the way you were shooting over the chrono. I've had the same thing happen a few times.

You'd see some sorta signs with a 117 at 3400. Even a 257 Weatherby would be close to top end with that sorta speed.

 

[35 Whelen]

I think I may have solved the chrono problem!
After closer examination of the unit I realized that the QD block that goes with the tripod , which attaches to the bottom, was indeed restriction the full travel of the chrono two halfs to open absolutely flat ! It wasn't much but thought I would measure exactly how much, OUCH.
View attachment 1 2.6 degrees ..... :shock:
Something tells me that needs to be addressed!


Update here is the new and improved model! That's better

 

[DrMike]

That would be enough to give some pretty high readings, to be sure.

 

[35 Whelen]

I bet your right again Mike! And maybe this will help someone else sometime! Wonder if 1 degree is about
75fps?? :?

 

[SJB358]

That'll do it right there! Glad you got that sorted out.

 

[35 Whelen]

Here is the actual 5 shot avg with 57 gr of RL25
Powder, once the Chrony was opened completely!
Using 117gr SSTs. CCI mag primers and Hornady cases.

 

[SJB358]

That's good speed right there. How are the groups looking?