Results of .270 Win Rem 700 with new receiver

[NYDAN]

I did get a chance to do a little shooting yesterday with Remington M700 NA Custom in .270 Winchester after the receiver was replaced. I will try to attach the results below.

I had cross winds gusting to about 10 mph during the session. However, since I was shooting out the garage I couldn't feel it and I didn't try to wait for calm periods. I just shot when I was ready. I have no idea of how much, in any, of the right and left variations were due to the wind.

Also, I was struggling with a "floater" in my left eye and I didn't feel like I was consistent in settling into the rifle. I don't feel confident had I am holding it the same each time. I am still on the learning curve for shooting left handed.

The outdoor temperatures during my previous sessions was much warmer probably averaging about 85 degrees. Yesterday was in the mid 50's here. I don't know how much of the variation in the factory velocities was due to cooler temperatures or due to the new receiver.

Previous velocities in the Nosler factory loads averaged 3070 fps. Now I am measuring about 3035 fps. The Remington loads previously averaged 2900 fps. Now I get something closer to 2800 fps. The Federal loads previously measured 3034 fps. Now they are running 3019 fps.

Based on this very small sampling (not statistically significant) the rifle seems to like the AB bullets better than BT bullets.

My velocities with the 140 gr AB and 58 gr. of H4831sc were disappointing to say the least. They are lower than before but I seated the bullets to match the Nosler factory loads C.O.A.L. of 3.250". Before I had set them a few thousands off the lands at 3.410 ". That might account for some of the velocity drop. Note that the 140 gr BT's loaded to 3.409 had velocities closer to the 2850 fps that I had attained before with 140 gr AB and 58 gr. of H4831sc.

I have a RCBS precision Mic on order to measure the spent cartridge headspaces. I plan to compare the spent cartridge cases from the original receiver with the cases from the replacement receiver.

I like the group I got with 140 AB and H4831sc if I can only get the velocity up to 2905 fps. Am I beating a dead horse if I stay with this powder? Should I try the H4350 or the IMR7828 that I have on hand or am I destined to go on a search for IMR4831 or RL22?

 

[DrMike]

I have two suggestions. Since velocity is your primary goal at this point, consider another powder. QL projections suggests a number of potential candidates.

Cartridge : .270 Win. (SAAMI)
Bullet : .277, 140, Nosler AccuBond 54765
Useable Case Capaci: 59.393 grain H2O = 3.856 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 22.0 inch = 558.8 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 64000 psi, or 441 MPa
or a maximum loading ratio or filling of 105 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

10 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Norma MRP 105.0 60.0 3.89 3055 99.1 61521 13943 1.066 ! Near Maximum !
Alliant Reloder-17 95.3 54.7 3.55 3041 100.0 64000 12449 1.049 ! Near Maximum !
Elcho 17 95.3 54.7 3.55 3041 100.0 64000 12449 1.049 ! Near Maximum !
IMR 7828 SSC 105.0 59.1 3.83 3020 96.7 61397 13613 1.056 ! Near Maximum !
ADI AR 2209 104.0 56.6 3.67 3013 98.2 64000 12989 1.041 ! Near Maximum !
PB Clermont PCL 511 96.9 56.5 3.66 3012 99.7 64000 12778 1.055 ! Near Maximum !
Alliant Reloder-19 104.6 57.3 3.71 3011 98.3 64000 13073 1.049 ! Near Maximum !
Ramshot Hunter 100.1 56.6 3.67 3010 99.7 64000 12760 1.055 ! Near Maximum !
Hodgdon H414 94.6 54.8 3.55 3007 99.4 64000 12787 1.056 ! Near Maximum !
Winchester 760 94.6 54.8 3.55 3007 99.4 64000 12787 1.056 ! Near Maximum !
Somchem S365 102.0 55.5 3.60 3007 100.0 64000 11893 1.062 ! Near Maximum !
Bofors RP14 ~approximation 105.0 57.5 3.73 2994 98.2 63294 12940 1.055 ! Near Maximum !
Norma URP 99.7 54.0 3.50 2992 100.0 64000 12250 1.061 ! Near Maximum !
Bofors RP19 ~approximation 99.7 54.0 3.50 2991 100.0 64000 12247 1.061 ! Near Maximum !
Vihtavuori N550 96.8 54.2 3.51 2991 100.0 64000 12393 1.065 ! Near Maximum !
Accurate 4350 98.8 54.1 3.51 2987 100.0 64000 12224 1.077 ! Near Maximum !
Norma 204 99.2 56.1 3.63 2986 98.1 64000 12719 1.050 ! Near Maximum !
Raufoss RA4 102.4 56.1 3.63 2986 98.1 64000 12719 1.050 ! Near Maximum !
Bofors RP4 ~approximation 102.4 56.1 3.63 2986 98.1 64000 12719 1.050 ! Near Maximum !
Vihtavuori N560 105.0 58.7 3.81 2985 95.6 58149 13853 1.091 ! Near Maximum !
Somchem S385 104.8 58.0 3.76 2976 99.0 64000 12535 1.067 ! Near Maximum !
ADI AR 2213 105.0 58.1 3.77 2975 96.2 59601 13344 1.070 ! Near Maximum !
IMR 4831 104.5 54.8 3.55 2974 100.0 64000 11989 1.069 ! Near Maximum !
Bofors RP4 NT ~approximation 100.0 55.6 3.60 2965 99.2 64000 12316 1.061 ! Near Maximum !
Winchester Supreme 780 102.9 59.4 3.85 2961 98.1 64000 12378 1.053 ! Near Maximum !
Hodgdon H4831 SC 105.0 58.1 3.77 2960 96.1 62587 12712 1.057 ! Near Maximum !
Bofors RP5/NP ~approximation 105.0 58.1 3.77 2960 97.5 57615 13419 1.100 ! Near Maximum !
Raufoss RA15 105.0 58.1 3.77 2960 97.5 57615 13419 1.100 ! Near Maximum !
Alliant Reloder-22 105.0 58.1 3.77 2960 97.5 57615 13419 1.100 ! Near Maximum !
Accurate MAGPRO 105.0 61.1 3.96 2960 93.8 57328 13798 1.104 ! Near Maximum !
Rottweil R904 103.2 55.7 3.61 2955 97.2 64000 12368 1.052 ! Near Maximum !
Alliant Reloder-15 90.7 49.7 3.22 2954 100.0 64000 11659 1.065 ! Near Maximum !
Raufoss RA11 90.7 49.7 3.22 2954 100.0 64000 11659 1.065 ! Near Maximum !
Bofors RP11 ~approximation 90.7 49.7 3.22 2954 100.0 64000 11659 1.065 ! Near Maximum !
Hodgdon Hybrid 100V 102.3 54.2 3.51 2953 100.0 64000 11294 1.060 ! Near Maximum !
Norma 203B 91.2 49.9 3.23 2951 100.0 64000 11561 1.067 ! Near Maximum !
Lovex S070 99.2 53.7 3.48 2951 99.4 64000 12127 1.069 ! Near Maximum !
Hodgdon H4350 102.0 54.6 3.54 2950 98.9 64000 12075 1.054 ! Near Maximum !
IMR 4350 100.1 54.5 3.53 2949 99.0 64000 12055 1.055 ! Near Maximum !
Hodgdon H380 92.0 51.5 3.34 2949 100.0 64000 11821 1.068 ! Near Maximum !
Ramshot Magnum 105.0 62.6 4.06 2946 98.1 58071 12931 1.089 ! Near Maximum !
Bofors RP3 92.4 51.1 3.31 2938 100.0 64000 11374 1.080 ! Near Maximum !
Norma 203 old 92.4 51.1 3.31 2938 100.0 64000 11374 1.080 ! Near Maximum !
Rottweil R903 94.4 51.1 3.31 2934 100.0 64000 11289 1.079 ! Near Maximum !
Elcho TR140 - preliminary data 91.7 51.8 3.36 2933 100.0 64000 11523 1.065 ! Near Maximum !
Rottweil R907 96.9 52.1 3.38 2930 99.0 64000 11904 1.063 ! Near Maximum !
Bofors RP7 96.9 52.1 3.38 2930 99.0 64000 11904 1.063 ! Near Maximum !
Somchem S355 94.6 50.7 3.28 2930 100.0 64000 11296 1.073 ! Near Maximum !
IMR 4007 SSC 93.9 52.1 3.38 2929 99.0 64000 11896 1.063 ! Near Maximum !
Lovex S065 98.1 52.5 3.40 2929 99.8 64000 11697 1.069 ! Near Maximum !
Somchem S361 102.0 59.5 3.85 2920 96.4 64000 12082 1.062 ! Near Maximum !
Accurate 4064 91.9 49.2 3.19 2895 100.0 64000 10679 1.100 ! Near Maximum !
Rottweil R902 90.8 47.9 3.11 2889 100.0 64000 10690 1.076 ! Near Maximum !
Rottweil R905 105.0 57.1 3.70 2887 94.9 55541 12812 1.120 ! Near Maximum !
Accurate 2700 93.9 53.7 3.48 2882 98.8 64000 11235 1.067 ! Near Maximum !
SNPE Vectan SP 12 105.0 61.4 3.98 2881 95.2 52520 13326 1.137
PB Clermont PCL 517 105.0 61.4 3.98 2875 94.9 52218 13316 1.140
Accurate 3100 105.0 57.5 3.73 2874 99.2 57510 12040 1.134 ! Near Maximum !
Bofors RP15 105.0 56.9 3.68 2873 96.2 52580 13087 1.148
Winchester WXR 105.0 56.9 3.68 2873 96.2 52580 13087 1.148
Hodgdon H4831 105.0 55.9 3.62 2834 94.3 54523 12210 1.125

Alternatively, increase your charge of H4831SC in 0.5 grain increments until you either achieve your desired velocity or see clear signs of pressure.

Cartridge : .270 Win. (SAAMI)
Bullet : .277, 140, Nosler AccuBond 54765
Useable Case Capaci: 59.393 grain H2O = 3.856 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Hodgdon H4831 SC

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 85 46.80 2338 1700 31850 9692 84.2 1.437
-18.0 87 47.97 2401 1791 34102 10047 85.7 1.399
-16.0 89 49.14 2463 1887 36521 10396 87.2 1.361
-14.0 91 50.31 2527 1985 39123 10737 88.6 1.316
-12.0 93 51.48 2591 2086 41924 11070 89.9 1.274
-10.0 95 52.65 2655 2191 44941 11392 91.2 1.232
-08.0 97 53.82 2720 2300 48197 11702 92.4 1.192
-06.0 99 54.99 2785 2411 51712 11998 93.5 1.153
-04.0 101 56.16 2850 2526 55516 12280 94.6 1.116 ! Near Maximum !
-02.0 104 57.33 2916 2644 59634 12545 95.5 1.080 ! Near Maximum !
+00.0 106 58.50 2982 2765 64105 12791 96.4 1.045 ! Near Maximum !
+02.0 108 59.67 3049 2890 68964 13017 97.2 1.011 !DANGEROUS LOAD-DO NOT USE!
+04.0 110 60.84 3115 3017 74255 13222 97.9 0.979 !DANGEROUS LOAD-DO NOT USE!
+06.0 112 62.01 3182 3148 80015 13403 98.5 0.947 !DANGEROUS LOAD-DO NOT USE!
+08.0 114 63.18 3249 3282 86283 13560 99.0 0.916 !DANGEROUS LOAD-DO NOT USE!
+10.0 116 64.35 3317 3420 93142 13689 99.4 0.887 !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 106 58.50 3135 3056 76943 12805 99.7 0.967 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 106 58.50 2784 2410 52295 12146 89.1 1.145

This will increase velocity incrementally, putting you in charge of overseeing the acceptance of your load.

 

[FOTIS]

rl22 WILL DO IT.

 

[DrMike]

If RL22 is not available, RL19 or RL17 should give you a boost in velocity. H414 or W760 is another alternative that should be reasonably easy to secure.

 

[SJB358]

I would give RL22 a go, along with 19 or 17 if you can find them. I would almost bet you'll get your speed back out of 22 while staying within your PSI goals. IMR7828 should work as well.

 

[BeeTee]

I saw in your notes that the rifle was returned because of uneven contact of the bolt lugs. In my experience and from what I've read, I've learned that factory rifles rarely produce even bolt lug contact. This is one of the things that is done to a bolt action rifle during an "accurizing" process by a careful and talented gunsmith.

I have two factory Rem 700s. Neither produces even bolt lug contact. The Ruger Scout 308 I bought last year doesn't produce even bolt lug contact either. All shoot well enough. A couple of them are very accurate.

Just my thoughts... BT

 

[NYDAN]

BeeTee,

Yes, I agree with your comments about "factory" rifles not having even contact on the bolt lugs. However, this rifle is the Remington North American Custom out of the Remington Custom shop. It is advertised as being blue printed and having equal bolt lug contact. It costs more than a production rifle. When I called them about the uneven contact they had me bring it right in. There were no questions and no arguments from Remington. They replaced the receiver at no cost to me and I had it back in a month. I really do have to compliment Remington on their treatment of me.

With the limited shooting I have done before and after replacement I do believe that it is more accurate now across a wider range of ammo.

 

[BeeTee]

NYDAN, thanks for clearing that up. Of course you're right, if it is advertised as having even bolt lug contact, then it should. That's part of why custom rifles cost more. I guess I wasn't aware of what a "M700 NA Custom" was. I hope you get it shooting the way you want/expect. BT

 

[JD338]

Try RL 22.

JD338

 

[IdahoCTD]

Try 55.0grs of IMR4350 with a 130gr bullet (this is a warm load so work up to it. Velocity is usually in the 3050-3100fps range). It's obvious Remington likes that powder too as does your rifle. Every .270 I've shot that load in has been exceptionally accurate. H4350 performs well also.

 

[NYDAN]

I received the RCBS Precision Mic today and measured the head space length on spent cartridges from both the old receiver and the new receiver. Depending on the brass the head space on cartridges fired in the old receiver measured from +.001" to +.003". The head space on the cartridges fired in the new receiver averaged 000". So, apparently the velocity differences I was measuring between the old receiver and the new receiver was from differences in the outside temperature rather than headspace differences.