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Quick question. Loaded up some 357 max with H110 and 180gr XTP . I used the cantilure closer to the base to give a longer COL and put the bullet closer to the lands. Started at 20gr powder and loaded up 10 rounds each at increasing increments. What I noticed is that there is a good bit of space in the casing. I put 24 grains in a case and mesure just to see. Even with 24 grains in there is a little extra space. I know that H110 doesnt like a lot of empty space. Will 20gr still be safe with the bullet seated in the cantilure closer to the base or will it create a pressure spike from too much empty room?
 

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I'm shooting 21.0 of H110 with a 180 XTP. I'm seated in the top groove because mine aren't double grooved. I've weighed several and there are 180 gr. I'm getting 1975 fps. No crimp. No pressure signs. I've shot 19.0, 20.0, 21.0 so far. At 19.0 I had vertical stringing. At 20.0 and 21.0 it went horizontal but tightened up. Going to reshoot with a better scope when weather allows.
2742D8EC-8BF0-496D-914E-FFD0449EC5A0.png
 

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You did not list your AOL.

I used Quickload (QL) and estimated an AOL of 2.03 based on a fill of 99.6% at 24 gr of H110.

I then dropped back to 20 gr and found a fill of 83% and QL predicted 1858 fps at 32.1 ksi.

As a warning, based on the Hodgdon test data, QL seems to be underestimating pressure by as much as 3,000 psi for these loads (assuming their 47000 cup is close to the current published limit for the 357 max, 40000 psi). I also do not know if you are shooting a cast iron SB1 or the steel SB2, so you need to understand what you are doing before you try to using anything in this post.

I seem to recall getting more consistent ignition at something like 85% to 90% fill.

Code:
Cartridge          : .357 Maximum (SAAMI)
Bullet             : .357, 180, Hornady HP/XTP 35771
Useable Case Capaci: 24.365 grain H2O = 1.582 cm³
Cartridge O.A.L. L6: 2.030 inch = 51.56 mm
Barrel Length      : 20.0 inch = 508.0 mm
Powder             : Hodgdon H110

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
%       %    Grains   fps   ft.lbs    psi    psi      %        ms
-04.8   83    20.00   1858    1380   32132   3002     96.6    1.322
-04.3   83    20.10   1867    1393   32598   3015     96.8    1.314
-03.8   84    20.20   1875    1405   33071   3028     96.9    1.306
-03.3   84    20.30   1884    1418   33550   3041     97.1    1.298
-02.9   85    20.40   1892    1431   34036   3054     97.2    1.291  ! Near Maximum !
-02.4   85    20.50   1900    1443   34528   3066     97.3    1.283  ! Near Maximum !
-01.9   85    20.60   1909    1456   35028   3079     97.5    1.275  ! Near Maximum !
-01.4   86    20.70   1917    1469   35534   3091     97.6    1.268  ! Near Maximum !
-01.0   86    20.80   1925    1481   36048   3103     97.7    1.260  ! Near Maximum !
-00.5   87    20.90   1933    1494   36568   3115     97.8    1.253  ! Near Maximum !
+00.0   87    21.00   1942    1507   37096   3126     98.0    1.245  ! Near Maximum !

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     87    21.00   2028    1644   44897   3042    100.0    1.159  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     87    21.00   1824    1330   29688   3061     92.1    1.361

Just in case you want to try dropping back to the 1.980" AOL used in the Hodgdon load data I also ran that length:

Code:
Cartridge          : .357 Maximum (SAAMI)
Bullet             : .357, 180, Hornady HP/XTP 35771
Useable Case Capaci: 23.098 grain H2O = 1.500 cm³
Cartridge O.A.L. L6: 1.980 inch = 50.29 mm
Barrel Length      : 20.0 inch = 508.0 mm
Powder             : Hodgdon H110

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
%       %    Grains   fps   ft.lbs    psi    psi      %        ms
-04.9   84    19.30   1829    1338   31873   2869     96.0    1.334
-04.4   85    19.40   1838    1350   32360   2882     96.2    1.326
-03.9   85    19.50   1847    1363   32853   2896     96.3    1.317
-03.4   86    19.60   1855    1376   33354   2909     96.5    1.309
-03.0   86    19.70   1864    1389   33862   2922     96.6    1.301
-02.5   87    19.80   1873    1402   34378   2935     96.8    1.293  ! Near Maximum !
-02.0   87    19.90   1881    1414   34902   2947     96.9    1.285  ! Near Maximum !
-01.5   88    20.00   1890    1427   35433   2960     97.1    1.277  ! Near Maximum !
-01.0   88    20.10   1898    1440   35972   2972     97.2    1.269  ! Near Maximum !
-00.5   88    20.20   1907    1453   36519   2984     97.4    1.261  ! Near Maximum !
+00.0   89    20.30   1916    1467   37075   2996     97.5    1.253  ! Near Maximum !

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     89    20.30   2003    1604   45002   2928     99.9    1.166  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     89    20.30   1797    1290   29577   2921     91.3    1.371
 

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Discussion Starter #5
Thanks for all the good info. I will mesure an acurate COL when I get back home to my real calipers and post it up.

Also it is the stronger of the two frames. Sorry if forget which is which. But it was a rifle frame from a .270 I sent in and had the 357 barrel fitted to back when they were still doing that.
 

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With the stronger frame, your gun has lots of margin.

I do not like the 40 ksi rating on the 357 max because a reloader can not really detect when his loads go above this value. Sticky extraction and ugly primers are not effective in this case.

Lots of reloaders for the 357 max are willing to go above the SAAMI rating. This is not a big deal in a Contender, Encore, CVA single shot or Handy SB2. These guns are safe for the 223 that runs 55 ksi. The early revolvers were also darn stout, but I do not think were really understand their limits as well as the 4 guns listed above. I think some of my IHMSA ammo with a 200 gr bullet and WW296 may have run close to 50 ksi. They just seemed to shoot better the hotter I was willing to go. Probably due to the increase in fill percentage.

I am reluctant to post QL output for the 357 max much above the SAAMI rating. I would be more willing to share this kind of info via PM.
 

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Pop the stock off, if the back of the reciever is solid it's an SB1. From what I've found 21.0 of H110 is max with a 180 gr bullet. I have shot 19.0, 20.0, and 21.0 in mine with no pressure signs. Some guys load hotter but I wouldn't do it on an SB1 frame.
 

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I have a 1982 handi in 357 max. Would it be an SB1 or 2?
Neither, SB designation didn't exist until NEF started production in 1987, all single barrel frames prior were ductile cast iron similar to SB1.

Tim
 
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