44Blam
11-26-2018, 12:23 AM
Well, I cast some nice hard boolits and finally got to shoot them today.
My results are interesting. I was shooting out of an AR10 style 308 with a 1:10 twist. It has a 20" barrel that slugs at .308.
I made 50 boolits: 25 sized to .311 and 25 sized to .309. These boolits are 174 grain cast from 3:2 ww:linotype and they are very hard. I gas checked and powder coated them.
I had feeding / cycling issues with the .311 boolits even after testing for function. I shot a couple with good accuracy but decided they were giving me too much problem and were a little too fat/seated wrong/etc.
So, I shot the ones sized to .309.
I found good accuracy and a good spread around 2300 fps. The spread for that load was: 2321,2369,2324,2353,2322 So, three shots in the 2320 fps range. For the 5 shots, my group was all within 1" with one I pulled that was about 2" away from the group.
Interestingly, 1 grain lower in powder gave me horrible accuracy and wild spreads in velocity: 2201,2277,2301,2267,2292 A couple boolits were close together, but one was 5" to the right and I don't know where one went.
Also, 1 grain up gave me a nice spread, but not as good accuracy. The spread was: Err, 2419,2417,2360,2432 They were all within 2", but a bit spread out.
I ran a scope up the bore and I found flakes of powder coat in the bore but no leading. After cleaning, I had a nice shiny bore with no lead. I also had no lead at the muzzle break. I did not have any signs of high pressure on any cases either.
I think I'm going to try to just lube the boolits instead of powder coating and see if I can size a little bigger, get them a little faster and get a little better accuracy.
My results are interesting. I was shooting out of an AR10 style 308 with a 1:10 twist. It has a 20" barrel that slugs at .308.
I made 50 boolits: 25 sized to .311 and 25 sized to .309. These boolits are 174 grain cast from 3:2 ww:linotype and they are very hard. I gas checked and powder coated them.
I had feeding / cycling issues with the .311 boolits even after testing for function. I shot a couple with good accuracy but decided they were giving me too much problem and were a little too fat/seated wrong/etc.
So, I shot the ones sized to .309.
I found good accuracy and a good spread around 2300 fps. The spread for that load was: 2321,2369,2324,2353,2322 So, three shots in the 2320 fps range. For the 5 shots, my group was all within 1" with one I pulled that was about 2" away from the group.
Interestingly, 1 grain lower in powder gave me horrible accuracy and wild spreads in velocity: 2201,2277,2301,2267,2292 A couple boolits were close together, but one was 5" to the right and I don't know where one went.
Also, 1 grain up gave me a nice spread, but not as good accuracy. The spread was: Err, 2419,2417,2360,2432 They were all within 2", but a bit spread out.
I ran a scope up the bore and I found flakes of powder coat in the bore but no leading. After cleaning, I had a nice shiny bore with no lead. I also had no lead at the muzzle break. I did not have any signs of high pressure on any cases either.
I think I'm going to try to just lube the boolits instead of powder coating and see if I can size a little bigger, get them a little faster and get a little better accuracy.