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Prc329
04-19-2008, 10:35 PM
Could anyone run some numbers for me real um quick :)

308, 24" barrel, seated to 2.815 with 155 scenars and 175g SMKs. I know Randall ran a few before but they were with 26" barrels and 2.8 seating depth. Much appreciated if anyone can run this. If not, thanks anyway.

ar15barrels
04-19-2008, 10:57 PM
Cartridge : .308 Win.
Bullet : .308, 175, Sierra HPBT MatchK 2275
Cartridge O.A.L. L6: 2.815 inch or 71.50 mm
Barrel Length : 24.0 inch or 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.

Matching Maximum Pressure: 60000 psi, or 413 MPa

or a maximum loading ratio or filling of 105 %

These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

60 loads produced a Loading Ratio below user-defined minimum of 80%. These powders have been skipped.

Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
SNPE Vectan SP 11 105.0 47.8 3.10 2751 99.5 59562 8871 1.152 !DANGEROUS LOAD-DO NOT USE!
IMR 4895 102.0 44.0 2.85 2737 100.0 60000 8248 1.142 !DANGEROUS LOAD-DO NOT USE!
Norma 203B 102.6 45.2 2.93 2731 99.6 60000 8621 1.164 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-15 102.1 45.0 2.91 2729 99.3 60000 8651 1.164 !DANGEROUS LOAD-DO NOT USE!
Raufoss RA11 102.1 45.0 2.91 2729 99.3 60000 8651 1.164 !DANGEROUS LOAD-DO NOT USE!
Winchester 748 94.1 44.6 2.89 2728 100.0 60000 8201 1.157 !DANGEROUS LOAD-DO NOT USE!
SNPE Vectan Sp 7 101.9 48.1 3.12 2727 99.3 60000 8668 1.161 !DANGEROUS LOAD-DO NOT USE!
IMR 3031 99.8 42.1 2.73 2717 100.0 60000 7699 1.162 !DANGEROUS LOAD-DO NOT USE!
Vihtavuori N550 105.0 48.3 3.13 2715 98.1 55880 9163 1.188 ! Near Maximum !
Hodgdon BL-C2 94.9 45.5 2.95 2712 99.9 60000 8361 1.169 !DANGEROUS LOAD-DO NOT USE!
IMR 4320 100.6 45.1 2.92 2710 99.5 60000 8327 1.151 !DANGEROUS LOAD-DO NOT USE!


Cartridge : .308 Win.
Bullet : .308, 155, Lapua Scenar GB491
Cartridge O.A.L. L6: 2.815 inch or 71.50 mm
Barrel Length : 24.0 inch or 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.

Matching Maximum Pressure: 60000 psi, or 413 MPa

or a maximum loading ratio or filling of 105 %

These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

58 loads produced a Loading Ratio below user-defined minimum of 80%. These powders have been skipped.

Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
IMR 4895 104.0 46.4 3.01 2919 99.8 60000 8803 1.080 !DANGEROUS LOAD-DO NOT USE!
Winchester 748 96.1 47.1 3.05 2914 99.9 60000 8773 1.094 !DANGEROUS LOAD-DO NOT USE!
Norma 203B 104.7 47.7 3.09 2912 99.0 60000 9149 1.101 !DANGEROUS LOAD-DO NOT USE!
IMR 3031 102.1 44.5 2.88 2911 100.0 60000 8244 1.097 !DANGEROUS LOAD-DO NOT USE!
Raufoss RA11 104.1 47.5 3.08 2910 98.6 60000 9167 1.101 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-15 104.1 47.5 3.08 2910 98.6 60000 9167 1.101 !DANGEROUS LOAD-DO NOT USE!
SNPE Vectan Sp 7 103.9 50.7 3.29 2906 98.6 60000 9179 1.098 !DANGEROUS LOAD-DO NOT USE!
Hodgdon BL-C2 96.8 48.0 3.11 2894 99.7 60000 8900 1.106 !DANGEROUS LOAD-DO NOT USE!
Accurate No.2520 97.9 47.6 3.08 2892 100.0 60000 8536 1.112 !DANGEROUS LOAD-DO NOT USE!
IMR 4320 102.5 47.5 3.08 2888 98.8 60000 8819 1.089 !DANGEROUS LOAD-DO NOT USE!


Something to watch...
Quickload shows only 0.092" of bullet seated into the neck on the 155's at 2.815" in a 2.014" long case.
This has to do with the long boattail on the scenars.
At the same OAL, the 175 SMK has 0.280" in the case neck.

Prc329
04-19-2008, 10:59 PM
Hmm. Could that be why the 175g SMK seems so much more consistent?

ar15barrels
04-19-2008, 11:01 PM
Hmm. Could that be why the 175g SMK seems so much more consistent?

Only if the bullets are moving during chambering.
Check the run-out of a dozen loaded rounds.
If they are not consistent, seat them deeper or make other changes to tooling/technique such as a fitted seating stem on BR style dies.

The general guideline that I was taught in respects to seating depth of the bullet shank in the case neck is that you want one caliber's worth.
So, 0.224" of bullet in a 223, 0.308" of bullet in a 308 etc...
Following this logic, 0.092" is not very much for a 308 and that's what made me mention it above.

Prc329
04-19-2008, 11:02 PM
Only if the bullets are moving during chambering.
Check the run-out of a dozen loaded rounds.
If they are not consistent, seat them deeper.

Thanks. I have been thinking of playing with the seating depth on the scenars.

ar15barrels
04-20-2008, 1:16 AM
Thanks. I have been thinking of playing with the seating depth on the scenars.

Something else that can help is to partial neck size.
Only size the top half of the neck.
This leaves the bottom half to center the case in the chamber better.

StraightShooter
04-20-2008, 11:04 AM
How come all of those loads in QuickLoad except for one say "dangerous load do not use." Is it just so you can compare different powders against each other and not to necessarily use them?

ar15barrels
04-20-2008, 12:47 PM
How come all of those loads in QuickLoad except for one say "dangerous load do not use." Is it just so you can compare different powders against each other and not to necessarily use them?

That's a default parameter in Quickload.
It says that when you are within 3% or 5% of the max specified pressure.
If I changed the max pressure to 67,000 PSI and asked for 60,000 PSI loads, the warning would be different.
Quickload does not want you to just grab the max listed load and run with it.
You still have to work up your own loads in your own rifle.
This is just a comparison of possible loads, showing which powder will most likely make the highest velocity with a specified set of conditions.
Changing ANY condition will often change the order.
For example, if I dropped the temperature 50 degrees, some powders would rank higher because other powders would lose burn rate.