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I've found that almost any cast bullet in the 150gr to 160gr weight range and 5.5gr or 6.0gr of bullseye in the 357mag cases will make excellent blammo ammo/plinking reloads. At 1 time I cast 10+ .358" bullets in that weight range and would burn them up with that bullseye/357mag combo.
Was playing around a couple years ago and put a scope on a 686 and was blasting away with a cramer "hunter" cast 158gr rn hp and a 640 series cast 158gr fn hp. The target looks like chicken scratch but I was simply testing 6-shot groups @ 50yds.
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The left top & bottom targets were 5.5gr of bullseye.
The right top & bottom targets were 6.0gr of bullseye.
The top targets were the hunter bullet.
The bottom targets were the 640 series bullets.
Nothing special, didn't take a lot of time shooting strings and used a front rest only. Measurements were done with a simple tape measure and all measurements are outside edge to outside edge of the bullet holes in the targets.
Basically all groups were 2" or less @ 50yds. Others might want better results, for me that's good enough for range fodder plinking/blammo ammo.
Very good groups. Glad to see someone using a tape measure or ruler to measure groups. So much more practical than a caliper.