The Firing Line Forums - View Single Post - 7.62x39 cast load work-up

Rangefinder · May 18, 2010, 01:07 PM

More tests today---Now I'm getting things worked in with the minor details.
These were fired from prone flopped out in the gravel. I'm sure they would tighten up quite a bit with a nice bag rest and a bench--just didn't feel like trucking the whole set-up out for a couple quick shots before the rain caught up to me.

25 yards 5-shot group
OAL 2.13 no crimp
The brown spot is because my coffee cup likes target shooting as much as I do

50 yards 3 separate 3-shot groups

Group 1 is the three in the bottom of the circle.
OAL 2.13 no crimp

Group 2 in the three just high and right.
OAL 2.16 no crimp

Group 3 is the two center and low right flier--(my fault on the flier--bad rest).
OAL 2.16 with slight roll crimp

What I've found so far:
Cycling is great all the way through. However, seat as far out as your magazine and lands will allow, then finish with a slight crimp. Without the crimp I noticed just a hint of incomplete burn occurring. WITH the crimp, burn appears more uniform, complete, and the bullet seems to prefer it as well. Sight slide was set at 100 for all groups. On a side note, H335 meters extremely well with a Lee dipper. 1CC dipper pulls a consistent 15 grains. I still weighed them individually just to confirm, but every dip came up even-money. From here out, I'm thinking it's going to be straight dipper for me on this load.

May 18, 2010, 01:07 PM	#10
Rangefinder Senior Member Join Date: August 4, 2005 Posts: 2,017	More tests today---Now I'm getting things worked in with the minor details. These were fired from prone flopped out in the gravel. I'm sure they would tighten up quite a bit with a nice bag rest and a bench--just didn't feel like trucking the whole set-up out for a couple quick shots before the rain caught up to me. 25 yards 5-shot group OAL 2.13 no crimp The brown spot is because my coffee cup likes target shooting as much as I do 50 yards 3 separate 3-shot groups Group 1 is the three in the bottom of the circle. OAL 2.13 no crimp Group 2 in the three just high and right. OAL 2.16 no crimp Group 3 is the two center and low right flier--(my fault on the flier--bad rest). OAL 2.16 with slight roll crimp What I've found so far: Cycling is great all the way through. However, seat as far out as your magazine and lands will allow, then finish with a slight crimp. Without the crimp I noticed just a hint of incomplete burn occurring. WITH the crimp, burn appears more uniform, complete, and the bullet seems to prefer it as well. Sight slide was set at 100 for all groups. On a side note, H335 meters extremely well with a Lee dipper. 1CC dipper pulls a consistent 15 grains. I still weighed them individually just to confirm, but every dip came up even-money. From here out, I'm thinking it's going to be straight dipper for me on this load. __________________ "Why is is called Common Sense when it seems so few actually possess it?" Guns only have two enemies: Rust and Politicians. Last edited by Rangefinder; May 18, 2010 at 03:46 PM.