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Showing results for tags 'n350'.
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Lots of cracked slides these days caused by less than perfect metallurgy, hardness, fitting, etc.. compounded by high pressure 9major loads. My goal in developing a great load is to maximize performance while NOT destroying me or my gun. The common sense recommendation is to use a slower powder to reduce case pressure. OK, slower powders measured & ranked how? Powder manufacturers charts are considered 'guidelines' as to 'relative' burn rates, and should maybe be considered most accurate with their own product? Add to this, the different burn rate charts available have conflicting ranks among the most popular powders used for 9major. And now for the rule of thumb Slower powders usually require more charge weight than fast powders to achieve the same velocity (assuming same bullet, barrel, primer & cart.). More conflict. So all of this has got me thinking... (probably over-thinking) The following is compiled from my own 9major load data over the years. This is a high level comparison - not a true apples to apples, since this is with 4 different barrel configurations, different temps, etc.. The last column is the charge weight of a 100% full 9mm case. Nice for relative density comparisons.
I picked up a new Czechmate and am starting to test loads. I have reamed the barrel so I can load longer. N350 fills the case almost to the top. but it is clean. So I went and did some testing last night. All were loaded in mixed range pickup brass with Precision Delta 124JHP N350 OAL 1.160 Autocomp OAL 1.155 Gn AV ES Sd PF Gn AV ES Sd PF 6.4 1271 60 20 157.6 6.4 1306 56 18 161.9 6.8 1284 56 20 159.2 6.6 1325 59 16 164.3 6.8 1325 47 11 164.3 6.8 1351 37 12 167.5 7.0 1354 33 9 167.8 7.0 1384 34 11 171.6 N350 at 7.0 gn @ 17 yards group was 3/4" Autocomp At 7.0 gn @ 17 yards group was 1"
So after 15 years, I've been forced to change powder since VV N350 is no longer available. Seems 3N38 is the only other VV option still in stock. Does anyone have a proven load for 38 Super 5" (32 Twist) 3 port HybriComp barrel, and 115gr bullets? Or something that will get me started? Thanks, Dave Pruitt davidpruitt.com