SCPigpen
Member
What follows is some data collected while shooting various load and rifle combinations.
Data was colected using a Master Chrony about 15feet from the muzzle. Temp was about 90 degrees and sunny. We noticed extreme velocity speads with a couple of loads in particular.(see below)
At first I thought I had screwed the pooch on a couple of rounds but then my brother got similar velocity spreads on some of his loads. His loads were 5.56 from an AR using 20 somthing grs of WC846.
I don't have the 5.56 data but here is what I have in my little book:
M91/30
7.62x54R
147gr FMJ BT .311
Privi Brass
47.5gr H4895
Win. LR Primers
AOL:3.10"
1. 2648
2. 2607
3. 3286
4. 3247
5. 2502
ES. 787.3
SD. 377.7
I also had some 8mm I shot over the chrony:
M48
8mm Mauser
220gr Honady Spire Point
49grs H4350
Win. LR Primer
RP Brass
AOL:3.05"
1. 2464
2. 2454
3. 2463
4. 2455
5. 2466
ES. 12.0
SD. 5.47
Some from the G-1
7.62x51
147gr FMJ BT
42gr WC846
TZ Brass
Win LR Primer
AOL: 2.75"
1. 3088
2. 3137
3. 3099
4. 3102
5. 3103
ES. 48.84
SD. 18.41
All of the ammo was stored in the trunks/bed of our vehicles and sat in the sun for an undetermined length of time. Only thing we could surmise was that the heat/sun is the cause of these spreads. It's always good to get other opinions.
So, what do you think?
Data was colected using a Master Chrony about 15feet from the muzzle. Temp was about 90 degrees and sunny. We noticed extreme velocity speads with a couple of loads in particular.(see below)
At first I thought I had screwed the pooch on a couple of rounds but then my brother got similar velocity spreads on some of his loads. His loads were 5.56 from an AR using 20 somthing grs of WC846.
I don't have the 5.56 data but here is what I have in my little book:
M91/30
7.62x54R
147gr FMJ BT .311
Privi Brass
47.5gr H4895
Win. LR Primers
AOL:3.10"
1. 2648
2. 2607
3. 3286
4. 3247
5. 2502
ES. 787.3
SD. 377.7
I also had some 8mm I shot over the chrony:
M48
8mm Mauser
220gr Honady Spire Point
49grs H4350
Win. LR Primer
RP Brass
AOL:3.05"
1. 2464
2. 2454
3. 2463
4. 2455
5. 2466
ES. 12.0
SD. 5.47
Some from the G-1
7.62x51
147gr FMJ BT
42gr WC846
TZ Brass
Win LR Primer
AOL: 2.75"
1. 3088
2. 3137
3. 3099
4. 3102
5. 3103
ES. 48.84
SD. 18.41
All of the ammo was stored in the trunks/bed of our vehicles and sat in the sun for an undetermined length of time. Only thing we could surmise was that the heat/sun is the cause of these spreads. It's always good to get other opinions.
So, what do you think?