Tuesday, November 19, 2013

Load Data for .307 Win and LeverEvolution Powder

In my ongoing quest with this powder, decided to bite the proverbial bullet and try it in my Marlin 336 with a .307 Win conversion. Seems everything I ran into about using this powder said it might not give any benefits, but that it will work obviously. Also, the general consensus is that the Hornady load data is extremely conservative. So I did some ladder testing with the exact components used.

90* ambient @ 72% humidity (Converted Marlin 336/20" bbl)

38gr LVR--2110fps__ES/40.6 SD/21.2 (this is close to their suggested start of 37.8)
40gr LVR--2214fps__ES/14.6 SD/10.7 (.4gr under their listed max, still a very weak load)
42gr LVR--2309fps__ES/34.0 SD/17.0 (now this started to feel like what a real .307 should)
43gr LVR--2411fps__ES/54.3 SD/27.0 (slightest bit of heavy extraction deemed this as max)

Now, you have to keep in mind and realize mine is a converted Marlin with a match chamber that really doesnt take well to any kind of full power/high pressure loads. Usually I meet it's pressure limits about 1gr shy of published max loads with most powders. Even the older factory ammo gives me sticky extraction. So, this being said.........I backed off from the 43gr load by a half grain to see the results:

42.5gr LVR--2440fps__ES/35.0 SD/18.3

As you can see, the consistancy improved as well as the velocity went up!!!


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