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Posted: 9/14/2010 11:05:56 AM EDT
[#1]
check hogdons site it will give you a clue
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Posted: 9/14/2010 11:13:51 AM EDT
[#2]
With a 20" barrel, you should be getting around 2,650 fps, +/- 50fps.
BL-C(2) is too slow to be effective with a 55gr bullet. |
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Posted: 9/14/2010 11:15:11 AM EDT
[#3]
Quoted:
With a 20" barrel, you should be getting around 2,650 fps, +/- 50fps. BL-C(2) is too slow to be effective with a 55gr bullet. What are you considering effective? |
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Posted: 9/14/2010 11:26:22 AM EDT
[#4]
Something with a MV over 3,000 fps.
BL-C(2) is the canister grade version of WC-846. After the powder debate, Olin took powder on the fast side of WC-846, and christened it WC-844. This was to be used in the 5.56. H-335 is the canister grade version of WC-844. For ball powders, TAC, H-335, AA-2230, AA-2460, and even W-748 (if you do not push it), are better choices for a 55gr bullet. |
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Posted: 9/14/2010 11:53:33 AM EDT
[#5]
Quoted:
Something with a MV over 3,000 fps. BL-C(2) is the canister grade version of WC-846. After the powder debate, Olin took powder on the fast side of WC-846, and christened it WC-844. This was to be used in the 5.56. H-335 is the canister grade version of WC-844. For ball powders, TAC, H-335, AA-2230, AA-2460, and even W-748 (if you do not push it), are better choices for a 55gr bullet. HMMM... Guess I'll have to get a chrono because I am very satisfied with the accuracy so far. I'm not doubting your expertise as I have none, but your original post seems a bit low for FPS. Checking hodgdon's site they don't list 55g NBT's but other 55's list a lot higher velocity. I realize these might be test loads in 24" barrels. Also they list H335 and BLC-2 using the same 55 bullet. Max load of 27g BLC-2 is 3220 fps with 51,500 psi. H335 max load is 22.8 3099 fps with 51,800 psi. Clearly H335 is a faster powder but it looks like you can get higher velocity using BLC-2 at less pressure. FWIW - I do plan to try some TAC in the near future. |
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Posted: 9/14/2010 1:21:27 PM EDT
[#6]
Quoted:
Quoted:
Something with a MV over 3,000 fps. BL-C(2) is the canister grade version of WC-846. After the powder debate, Olin took powder on the fast side of WC-846, and christened it WC-844. This was to be used in the 5.56. H-335 is the canister grade version of WC-844. For ball powders, TAC, H-335, AA-2230, AA-2460, and even W-748 (if you do not push it), are better choices for a 55gr bullet. HMMM... Guess I'll have to get a chrono because I am very satisfied with the accuracy so far. I'm not doubting your expertise as I have none, but your original post seems a bit low for FPS. Checking hodgdon's site they don't list 55g NBT's but other 55's list a lot higher velocity. I realize these might be test loads in 24" barrels. Also they list H335 and BLC-2 using the same 55 bullet. Max load of 27g BLC-2 is 3220 fps with 51,500 psi. H335 max load is 22.8 3099 fps with 51,800 psi. Clearly H335 is a faster powder but it looks like you can get higher velocity using BLC-2 at less pressure. FWIW - I do plan to try some TAC in the near future. Hodgdon uses 24" Barrel with their data and use .223 Remington Chambers, not 5.56 Chambers. Hornady says they get ~2,600 fps with a 14" Barreled .223 Contender. (25.4gr of BL-C(2)) Hodgdon says they get 2,558 fps with a 15" Barreled .223 Encore. (25.5gr of BL-C(2)) Rifle: AR-15 Barrel Length: 20" SS Chamber: 5.56x45 Twist: 1/12" Case: Winchester Primer: Remington 7 1/2 Trim Length: 1.750" COAL: 2.26" Bullet: 55gr Speer SP 25.0gr BL-C(2) 2,589 fps 26.0gr BL-C(2) 2,751 fps 27.0gr BL-C(2) 2,899 fps. |
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Posted: 9/14/2010 1:52:50 PM EDT
[#7]
IMO, if you're punching paper, don't chase a velocity number. Choose the most accurate load and know your dope for various ranges.
If you're hunting, OTOH, especially with a bullet that depends on velocity for expansion or fragmentation, then a compromise might be made in terms of accuracy versus velocity. JMHO. YMMV. |
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Posted: 9/14/2010 1:59:22 PM EDT
[#8]
I'm glad you are getting good results because I haven't found a good load with 55grn and blc2. I have been playing around with Hornady 55grn Vmax though.
Anyway, at 25.5 grns of blc2 behind the 55grn Vmax, I was getting 2,906 fps Avg. I settled at 26.5 running about 2,958 fps. I say settled because I've found very little consistancy with that powder/bullet combination. Like someone else said, it may be becasue it's better suited with the heavier bullets, It may be because it's been damn hot here all summer. I've read it's temperature sensitive 
ETA....20inch stainless barrel. |
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Posted: 9/14/2010 2:37:32 PM EDT
[#9]
Quoted:
I'm glad you are getting good results because I haven't found a good load with 55grn and blc2. I have been playing around with Hornady 55grn Vmax though. Anyway, at 25.5 grns of blc2 behind the 55grn Vmax, I was getting 2,906 fps Avg. I settled at 26.5 running about 2,958 fps. I say settled because I've found very little consistancy with that powder/bullet combination. Like someone else said, it may be becasue it's better suited with the heavier bullets, It may be because it's been damn hot here all summer. I've read it's temperature sensitive
ETA....20inch stainless barrel. Your velocity sounds more like what I am looking for. I have a Leupold Mark AR 6-18x40 that is calibrated for 55gr bullets at 3100 fps so I would like to get close to that and still be accurate. My top results so far are: 5 rounds at 100 yds - .565" 10 rounds at 200 yds - 1.736" 25.5 grains BLC-2 / 55gr NBT / LC08 Brass / BR4 primer - 2.24" COL This was using a backpack and rear bag seated on a bench. This is just for punching paper right now and hopefully some small critters. I also have a load using 69g SMK's that shows some promise. |
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Posted: 9/14/2010 4:38:48 PM EDT
[#10]
Quoted:
Quoted:
I'm glad you are getting good results because I haven't found a good load with 55grn and blc2. I have been playing around with Hornady 55grn Vmax though. Anyway, at 25.5 grns of blc2 behind the 55grn Vmax, I was getting 2,906 fps Avg. I settled at 26.5 running about 2,958 fps. I say settled because I've found very little consistancy with that powder/bullet combination. Like someone else said, it may be becasue it's better suited with the heavier bullets, It may be because it's been damn hot here all summer. I've read it's temperature sensitive
ETA....20inch stainless barrel. Your velocity sounds more like what I am looking for. I have a Leupold Mark AR 6-18x40 that is calibrated for 55gr bullets at 3100 fps so I would like to get close to that and still be accurate. My top results so far are: 5 rounds at 100 yds - .565" 10 rounds at 200 yds - 1.736" 25.5 grains BLC-2 / 55gr NBT / LC08 Brass / BR4 primer - 2.24" COL This was using a backpack and rear bag seated on a bench. This is just for punching paper right now and hopefully some small critters. I also have a load using 69g SMK's that shows some promise. Sounds to me like you need a chronograph. Chronographs aren't that expensive unless you need a really good one. I bought the Pro Chrono from Cabelas for $100. I really like it assuming it's accurate. Plus, if you know your velocities, you can always dial your scope in instead of always using one load that you hope matches up with your scope. As for your groups, I would be exstatic with .565". The best I've been able to do is an inch, but 1.25 - 1.5 is typical. I've had better luck with 69 grn SMK's and Varget. Have you said what twist your barrel is? |
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Posted: 9/14/2010 4:39:22 PM EDT
[#11]
Quoted:
Quoted:
I'm glad you are getting good results because I haven't found a good load with 55grn and blc2. I have been playing around with Hornady 55grn Vmax though. Anyway, at 25.5 grns of blc2 behind the 55grn Vmax, I was getting 2,906 fps Avg. I settled at 26.5 running about 2,958 fps. I say settled because I've found very little consistancy with that powder/bullet combination. Like someone else said, it may be becasue it's better suited with the heavier bullets, It may be because it's been damn hot here all summer. I've read it's temperature sensitive
ETA....20inch stainless barrel. Your velocity sounds more like what I am looking for. I have a Leupold Mark AR 6-18x40 that is calibrated for 55gr bullets at 3100 fps so I would like to get close to that and still be accurate. My top results so far are: 5 rounds at 100 yds - .565" 10 rounds at 200 yds - 1.736" 25.5 grains BLC-2 / 55gr NBT / LC08 Brass / BR4 primer - 2.24" COL This was using a backpack and rear bag seated on a bench. This is just for punching paper right now and hopefully some small critters. I also have a load using 69g SMK's that shows some promise. Sounds to me like you need a chronograph. Chronographs aren't that expensive unless you need a really good one. I bought the Pro Chrono from Cabelas for $100. I really like it assuming it's accurate. Plus, if you know your velocities, you can always dial your scope in instead of always using one load that you hope matches up with your scope. As for your groups, I would be exstatic with .565". The best I've been able to do is an inch, but 1.25 - 1.5 is typical. I've had better luck with 69 grn SMK's and Varget. Have you said what twist your barrel is? |
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Posted: 9/14/2010 5:05:01 PM EDT
[#12]
1:8
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Posted: 9/14/2010 5:38:45 PM EDT
[#13]
Quoted:
I'm glad you are getting good results because I haven't found a good load with 55grn and blc2. I have been playing around with Hornady 55grn Vmax though. Anyway, at 25.5 grns of blc2 behind the 55grn Vmax, I was getting 2,906 fps Avg. I settled at 26.5 running about 2,958 fps. I say settled because I've found very little consistancy with that powder/bullet combination. Like someone else said, it may be becasue it's better suited with the heavier bullets, It may be because it's been damn hot here all summer. I've read it's temperature sensitive
ETA....20inch stainless barrel. What bullet are you using in your BLC2 load? |
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