Determining a safe load?

[Bigcat_hunter]

Ok, I have recently bought a sako 75 finnlight 300 WSM. I was surprised to see that it is a long action. I bought a full length magazine so I can run 200 grain accubonds seated close to the lands.

The max load for IMR 7828 in the book is 68 grains with an overall length of 2.860". With my bullets 0.020 off the lands my overall length is 3.100.

That leaves me 0.24 of extra case capacity. How can I safely determine a maximum load before heading to the range.

 

[old #7]

You should always start low and work up.
If you are interested in is finding the max load and the highest velocity before going after accuracy try this.
Load up to the max in .5gr increments. Shoot over your chrony and examine your cases after every shot.
Look for flattening primers, ejector marks on the head, of course pay attention to bolt lift and watch your velocity.
Sometimes when you get near max your velocity will stop increasing as the powder charge increases.

Always start low and work up.

 

[FOTIS]

Ok, I have recently bought a sako 75 finnlight 300 WSM. I was surprised to see that it is a long action. I bought a full length magazine so I can run 200 grain accubonds seated close to the lands.

The max load for IMR 7828 in the book is 68 grains with an overall length of 2.860". With my bullets 0.020 off the lands my overall length is 3.100.

That leaves me 0.24 of extra case capacity. How can I safely determine a maximum load before heading to the range.

Help is on the way Big cat....


Cartridge : .300 WSM (CIP)
Bullet : .308, 200, Nosler AccuBond 54618
Cartridge O.A.L. L6: 3.100 inch or 78.74 mm
Barrel Length : 24.0 inch or 609.6 mm
Powder : IMR 7828 SSC

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 82 56.80 2328 2406 32186 9603 89.6 1.605
-18.0 85 58.22 2389 2535 34452 9925 91.0 1.561
-16.0 87 59.64 2451 2668 36884 10235 92.3 1.517
-14.0 89 61.06 2513 2805 39497 10531 93.5 1.468
-12.0 91 62.48 2576 2946 42308 10812 94.7 1.421
-10.0 93 63.90 2638 3091 45333 11076 95.7 1.375
-08.0 95 65.32 2701 3240 48595 11322 96.6 1.331
-06.0 97 66.74 2764 3392 52112 11548 97.5 1.288
-04.0 99 68.16 2826 3547 55910 11752 98.2 1.247 ! Near Maximum !
-02.0 101 69.58 2889 3706 60019 11934 98.8 1.208 ! Near Maximum !
+00.0 103 71.00 2951 3868 64471 12091 99.2 1.170 !DANGEROUS LOAD-DO NOT USE!
+02.0 105 72.42 3013 4032 69301 12222 99.6 1.133 !DANGEROUS LOAD-DO NOT USE!
+04.0 107 73.84 3075 4200 74551 12326 99.9 1.097 !DANGEROUS LOAD-DO NOT USE!
+06.0 109 75.26 3137 4370 80268 12402 100.0 1.062 !DANGEROUS LOAD-DO NOT USE!
+08.0 111 76.68 3199 4543 86510 12451 100.0 1.029 !DANGEROUS LOAD-DO NOT USE!
+10.0 113 78.10 3260 4719 93337 12491 100.0 0.997 !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 71.00 3087 4231 78677 11617 100.0 1.080 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 103 71.00 2758 3378 52097 11881 93.7 1.285



and.............................................................


Cartridge : .300 WSM (CIP)
Bullet : .308, 200, Nosler AccuBond 54618
Cartridge O.A.L. L6: 3.100 inch or 78.74 mm
Barrel Length : 24.0 inch or 609.6 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 !

128 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 102.4 71.7 4.64 2961 100.0 64000 12111 1.187 ! Near Maximum !
Vihtavuori N560 104.2 71.4 4.63 2958 98.9 64000 12505 1.183 ! Near Maximum !
Accurate MAGPRO 104.5 74.5 4.83 2951 97.9 64000 12606 1.189 ! Near Maximum !
IMR 7828 SSC 102.9 70.9 4.59 2945 99.2 64000 12076 1.173 ! Near Maximum !
Raufoss RA15 104.5 70.8 4.59 2934 99.8 64000 11982 1.189 ! Near Maximum !
Alliant Reloder-22 104.5 70.8 4.59 2934 99.8 64000 11982 1.189 ! Near Maximum !
Bofors RP5/NP ~approximation 104.5 70.8 4.59 2934 99.8 64000 11982 1.189 ! Near Maximum !
ADI AR 2213 103.8 70.4 4.56 2930 99.1 64000 11981 1.173 ! Near Maximum !
SNPE Vectan SP 12 105.0 75.2 4.87 2899 99.1 59659 12130 1.211 ! Near Maximum !
PB Clermont PCL 517 105.0 75.2 4.87 2895 99.0 59302 12141 1.214 ! Near Maximum !
Ramshot Magnum (Big Boy) 105.0 75.0 4.86 2891 99.0 58968 12142 1.217 ! Near Maximum !
ADI AR 2209 100.7 67.1 4.35 2890 99.7 64000 11348 1.181 ! Near Maximum !
Alliant Reloder-19 101.2 67.9 4.40 2889 99.7 64000 11416 1.188 ! Near Maximum !
Bofors RP14 ~approximation 102.0 68.4 4.43 2882 99.7 64000 11336 1.189 ! Near Maximum !
Rottweil R905 105.0 69.9 4.53 2881 98.7 62595 11662 1.202 ! Near Maximum !
Ramshot Hunter 93.8 67.0 4.34 2879 100.0 64000 10964 1.195 ! Near Maximum !
Winchester 760 91.4 64.8 4.20 2877 100.0 64000 11009 1.197 ! Near Maximum !
Hodgdon H4350 96.4 64.3 4.17 2877 100.0 64000 10784 1.189 ! Near Maximum !
Winchester WXR 105.0 69.6 4.51 2869 99.4 59464 11848 1.229 ! Near Maximum !
Hodgdon H4831 SC 103.4 70.1 4.54 2868 98.2 64000 11379 1.185 ! Near Maximum !
Norma 204 96.0 66.5 4.31 2865 99.6 64000 11122 1.190 ! Near Maximum !
Raufoss RA4 99.2 66.5 4.31 2865 99.6 64000 11122 1.190 ! Near Maximum !
Bofors RP4 ~approximation 99.2 66.5 4.31 2865 99.6 64000 11122 1.190 ! Near Maximum !
IMR 4831 104.3 67.0 4.34 2857 100.0 64000 10643 1.208 ! Near Maximum !
Somchem S365 98.3 65.5 4.25 2856 100.0 64000 10162 1.208 ! Near Maximum !
Vihtavuori N550 93.6 64.1 4.15 2855 100.0 64000 10620 1.207 ! Near Maximum !
Norma URP 96.3 63.9 4.14 2853 100.0 64000 10478 1.203 ! Near Maximum !
Bofors RP19 ~approximation 96.3 63.9 4.14 2853 100.0 64000 10475 1.203 ! Near Maximum !
IMR 4350 101.1 64.9 4.21 2852 99.2 64000 11027 1.192 ! Near Maximum !
Somchem S385 101.4 68.7 4.45 2851 99.9 64000 10867 1.208 ! Near Maximum !
Accurate 4350 99.7 64.0 4.14 2848 100.0 64000 10424 1.220 ! Near Maximum !
ADI AP 2214 105.0 73.1 4.74 2840 98.6 58066 11629 1.223 ! Near Maximum !
IMR 7828 105.0 68.4 4.43 2838 98.3 56653 11788 1.240 ! Near Maximum !
Rottweil R904 100.0 66.1 4.29 2837 99.1 64000 10873 1.192 ! Near Maximum !
Ramshot BigGame 92.8 62.2 4.03 2830 100.0 64000 10108 1.202 ! Near Maximum !
SNPE Vectan SP 11 90.0 62.3 4.04 2829 100.0 64000 10094 1.203 ! Near Maximum !
Alliant Reloder-25 105.0 70.0 4.54 2813 100.0 53312 11410 1.278
Rottweil R907 93.9 61.8 4.01 2805 99.9 64000 10331 1.205 ! Near Maximum !
IMR 4007 SSC 91.0 61.9 4.01 2805 99.9 64000 10324 1.205 ! Near Maximum !
Hodgdon H4831 105.0 68.4 4.43 2798 97.5 58983 11161 1.229 ! Near Maximum !
Vihtavuori N165 105.0 69.6 4.51 2792 99.7 60552 10538 1.229 ! Near Maximum !
Rottweil R903 93.9 60.5 3.92 2790 100.0 64000 9649 1.224 ! Near Maximum !
Somchem S355 91.5 60.0 3.89 2788 100.0 64000 9677 1.217 ! Near Maximum !
Hodgdon VARGET 90.7 58.8 3.81 2784 100.0 64000 9662 1.198 ! Near Maximum !
ADI AR 2208 90.4 58.8 3.81 2784 100.0 64000 9662 1.198 ! Near Maximum !
Vihtavuori N160 105.0 67.5 4.37 2776 98.6 60657 10552 1.224 ! Near Maximum !
IMR 4064 91.1 57.7 3.74 2773 100.0 64000 9457 1.203 ! Near Maximum !
Accurate 2700 92.1 63.8 4.13 2760 99.9 64000 9764 1.209 ! Near Maximum !
Hodgdon H4895 90.2 58.5 3.79 2756 100.0 64000 9140 1.205 ! Near Maximum !
Accurate 4064 92.7 58.1 3.77 2745 100.0 64000 9119 1.246 ! Near Maximum !
Vihtavuori N150 96.5 61.1 3.96 2744 100.0 64000 9132 1.218 ! Near Maximum !
Vihtavuori N140 93.1 60.0 3.89 2741 100.0 64000 9076 1.211 ! Near Maximum !
Norma MRP 2 105.0 70.4 4.56 2737 97.4 48761 11885 1.342
Vihtavuori N570 105.0 74.2 4.81 2730 91.5 46899 12662 1.354
Accurate 3100 105.0 66.6 4.31 2696 99.9 53590 10289 1.326
Vihtavuori N135 92.7 56.4 3.65 2693 100.0 64000 8426 1.232 ! Near Maximum !
Hodgdon H1000 105.0 69.6 4.51 2678 96.6 48412 11122 1.330
Hodgdon Retumbo 105.0 70.8 4.59 2615 98.1 41767 11555 1.427
ADI AR 2218 105.0 75.0 4.86 2578 87.0 41934 12085 1.423
Vihtavuori 24N41 105.0 75.0 4.86 2552 82.8 44456 10769 1.395
Vihtavuori N170 105.0 69.6 4.51 2532 88.9 44303 10392 1.428
Hodgdon H870 105.0 72.7 4.71 2510 89.4 37489 11468 1.512
Hodgdon US 869 105.0 75.0 4.86 2474 86.1 37973 10995 1.501
Hodgdon 50BMG 105.0 71.5 4.63 2375 74.4 36451 9910 1.537
SNPE Vectan SP 13 105.0 71.9 4.66 2329 83.1 33053 9867 1.600
Vihtavuori 20N29 105.0 75.8 4.91 2272 77.8 31117 9752 1.649
PB Clermont PCL 513/520/9520 105.0 71.9 4.66 2268 79.7 31139 9527 1.638
Accurate 8700 105.0 72.1 4.67 2239 79.6 30473 9413 1.647
NC A3502 ,test only 105.0 68.9 4.46 2089 55.4 29619 7191 1.693
TLP A 502(RH) ,test only 105.0 68.9 4.46 2067 60.0 27715 7647 1.740
V1734 7-multiperf ,test only 105.0 68.9 4.46 1487 27.4 15585 3530 2.250

 

[Bigcat_hunter]

THANKS POP

 

[Big Squeeze]

Ok, I have recently bought a sako 75 finnlight 300 WSM. I was surprised to see that it is a long action. I bought a full length magazine so I can run 200 grain accubonds seated close to the lands.

The max load for IMR 7828 in the book is 68 grains with an overall length of 2.860". With my bullets 0.020 off the lands my overall length is 3.100.

That leaves me 0.24 of extra case capacity. How can I safely determine a maximum load before heading to the range.

................Regardless of what your OAL is, go by the book anyway and work your loads up carefully.

I took some load samples off of the "reloadersnest" site to try in my own 300 WSM.....One particular loading used a 200 gr. Nosler AccuBond with 68 gr. Rel #19 with an OAL of 2.860" fired from a 24" barrel that I duplicated. It is still posted there.

The result was 2930 fps MV from his rifle. Each rifle has its own individual tolerence level for max. loads, I discovered that my Ruger M77 Frontier was able to handle another grain @ 69 grains, as 68 grains showed no pressure signs in my rifle.

But testing @ 69 gr. there were some slightly visible pressure signs with the primers. However there were no bolt lift or extraction problems and no case head shiny marks that day shooting in 90 degree weather.

At 69 gr. Rel 19, with the 200 A/B, I was able to chrony 2828 fps. from my little 16.5" tubed Frontier w/ 1.20" average groupings; outside hole to outside hole dimension.

Another powder that you may want to try later in your 300 WSM as I will do in mine when available, is the new REL 17. Supposedly, it is designed specifically for the WSM`s to give the best velocity along with the better accuracy vs all other 300 WSM powders that are listed in the Speer manual,,,according to Alliant.

 

[Bigcat_hunter]

Ok, I have recently bought a sako 75 finnlight 300 WSM. I was surprised to see that it is a long action. I bought a full length magazine so I can run 200 grain accubonds seated close to the lands.

The max load for IMR 7828 in the book is 68 grains with an overall length of 2.860". With my bullets 0.020 off the lands my overall length is 3.100.

That leaves me 0.24 of extra case capacity. How can I safely determine a maximum load before heading to the range.

................Regardless of what your OAL is, go by the book anyway and work your loads up carefully.

I took some load samples off of the "reloadersnest" site to try in my own 300 WSM.....One particular loading used a 200 gr. Nosler AccuBond with 68 gr. Rel #19 with an OAL of 2.860" fired from a 24" barrel that I duplicated. It is still posted there.

The result was 2930 fps MV from his rifle. Each rifle has its own individual tolerence level for max. loads, I discovered that my Ruger M77 Frontier was able to handle another grain @ 69 grains, as 68 grains showed no pressure signs in my rifle.

But testing @ 69 gr. there were some slightly visible pressure signs with the primers. However there were no bolt lift or extraction problems and no case head shiny marks that day shooting in 90 degree weather.

At 69 gr. Rel 19, with the 200 A/B, I was able to chrony 2828 fps. from my little 16.5" tubed Frontier w/ 1.20" average groupings; outside hole to outside hole dimension.

Another powder that you may want to try later in your 300 WSM as I will do in mine when available, is the new REL 17. Supposedly, it is designed specifically for the WSM`s to give the best velocity along with the better accuracy vs all other 300 WSM powders that are listed in the Speer manual,,,according to Alliant.

I use reloader 19 for my 30-06 and have noticed every time I buy a new pound of powder, the velocity will change. I don't think reloader 19 is very consistant from lot to lot.

 

[Big Squeeze]

Ok, I have recently bought a sako 75 finnlight 300 WSM. I was surprised to see that it is a long action. I bought a full length magazine so I can run 200 grain accubonds seated close to the lands.

The max load for IMR 7828 in the book is 68 grains with an overall length of 2.860". With my bullets 0.020 off the lands my overall length is 3.100.

That leaves me 0.24 of extra case capacity. How can I safely determine a maximum load before heading to the range.

................Regardless of what your OAL is, go by the book anyway and work your loads up carefully.

I took some load samples off of the "reloadersnest" site to try in my own 300 WSM.....One particular loading used a 200 gr. Nosler AccuBond with 68 gr. Rel #19 with an OAL of 2.860" fired from a 24" barrel that I duplicated. It is still posted there.

The result was 2930 fps MV from his rifle. Each rifle has its own individual tolerence level for max. loads, I discovered that my Ruger M77 Frontier was able to handle another grain @ 69 grains, as 68 grains showed no pressure signs in my rifle.

But testing @ 69 gr. there were some slightly visible pressure signs with the primers. However there were no bolt lift or extraction problems and no case head shiny marks that day shooting in 90 degree weather.

At 69 gr. Rel 19, with the 200 A/B, I was able to chrony 2828 fps. from my little 16.5" tubed Frontier w/ 1.20" average groupings; outside hole to outside hole dimension.

Another powder that you may want to try later in your 300 WSM as I will do in mine when available, is the new REL 17. Supposedly, it is designed specifically for the WSM`s to give the best velocity along with the better accuracy vs all other 300 WSM powders that are listed in the Speer manual,,,according to Alliant.

I use reloader 19 for my 30-06 and have noticed every time I buy a new pound of powder, the velocity will change. I don't think reloader 19 is very consistant from lot to lot.

.................That could be!.....#17 may be different though!.......