dmftoy1
Member
Ok, my second batch of .223 (5.56) loads was shot today and I'm trying to figure out which way i want to go with the next batch. Here's the spec:
LC04 Case
Winchester SRP
H335 Powder (24.4 grains)
55 grain Winchester FMJ bullet
2.240 COL
Rifle - 20 Inch RRA A3 with wylde chamber. (homemade lower)
My first 10 shot string (after fowling) had the following stats:
2961 fps (high)
2855 fps (low)
2906 fps (Avg)
35.49 (Std Dev)
My second 10 shot string:
2928 fps (high)
2812 fps (low)
2885 fps (Avg)
45.73 (Std. Dev)
The strings were fired "relatively" rapid fire . .say 5-7 seconds between shots. Basically enough time to glance from the scope over to the readout to see if the chrono had registered the shot.
I'm not a great "rest" shooter but this stuff wasn't as accurate as the XM193 that I was shooting before. There was a light wind and I was shooting off a bag of corncob media and put 4 shots into an inch and 1/4 at 100 yards (was going to be a 5 shot string but used one more fowling than I thought I did. )
I'm not seeing the velocities that the manuals say I should for this amount of H335. Could that be because the rifle is pretty new? (It's had maybe 100 rounds through it). I'm thinking my next step is to length out the COL to 2.250
Any and all input is welcomed.
Have a good one,
Dave
LC04 Case
Winchester SRP
H335 Powder (24.4 grains)
55 grain Winchester FMJ bullet
2.240 COL
Rifle - 20 Inch RRA A3 with wylde chamber. (homemade lower)
My first 10 shot string (after fowling) had the following stats:
2961 fps (high)
2855 fps (low)
2906 fps (Avg)
35.49 (Std Dev)
My second 10 shot string:
2928 fps (high)
2812 fps (low)
2885 fps (Avg)
45.73 (Std. Dev)
The strings were fired "relatively" rapid fire . .say 5-7 seconds between shots. Basically enough time to glance from the scope over to the readout to see if the chrono had registered the shot.
I'm not a great "rest" shooter but this stuff wasn't as accurate as the XM193 that I was shooting before. There was a light wind and I was shooting off a bag of corncob media and put 4 shots into an inch and 1/4 at 100 yards (was going to be a 5 shot string but used one more fowling than I thought I did. )
I'm not seeing the velocities that the manuals say I should for this amount of H335. Could that be because the rifle is pretty new? (It's had maybe 100 rounds through it). I'm thinking my next step is to length out the COL to 2.250
Any and all input is welcomed.
Have a good one,
Dave