204 ruger coal

patchy · February 23, 2009, 08:23 PM

Looking for some ideas on bullet seating.Loading32gr.v max with IMR4895 ,cci450.I cant get bullet close to the lands.Shooting this setup in a t/c encore.

rn22723 · February 23, 2009, 09:23 PM

Follow the data in the reloading manual or call up Hornday? Factory chambers are generous. Get a load that works then mess with COAL.

Hodgdon Powder Company
Cartridge Load Recipe Report - 2/23/2009
data.hodgdon.com 204 Ruger
Load Type: Rifle Powder: IMR 4895

Cartridge Information
Case: Hornady Barrel Length: 24"
Twist: 1:12" Trim Length: 1.840"
Primer: Federal 205M

204 Ruger
Cartridge Load Data Starting Loads

--------------------------------------------------------------------------------
Maximum Loads

--------------------------------------------------------------------------------

Bullet Weight (Gr.) Powder Bullet Diam. C.O.L. Grs. Vel. (ft/s) Pressure Grs. Vel. (ft/s) Pressure
32 GR. HDY V-MAX IMR 4895 .204" 2.250" 27.0 3627 40,500 PSI 29.0C 3949 51,900 PSI
35 GR. BER HP IMR 4895 .204" 2.240" 26.5 3550 43,300 PSI 28.3C 3864 55,500 PSI
40 GR. HDY V-MAX IMR 4895 .204" 2.250" 26.0 3415 44,700 PSI 27.8C 3695 56,000 PSI
50 GR. BER HPBT IMR 4895 .204" 2.300" 24.0 3092 45,400 PSI 26.2C 3344 56,000 PSI

NEVER EXCEED MAXIMUM LOADS

mesillajim · February 24, 2009, 12:20 PM

Patchy:
Get yourself a Stoney Point O.A.L Gauge and the threaded .204 cartridge. You can then use it to measure OAL with each bullet you use. Examples in my CZ .204: With Sierra 32 BK the OAL is 2.447"; with a Sierra 39 BK OAL is 2.441". The OAL measurements will vary slightly due to the variations in the tip conditions (lead tip sometimes is dented; hollowpoints are uneven, etc) so I use what I call the Base to Ogive (BTO) measurement. Get a bullet comparator (Sinclair, Stoney Point, etc) to use with you calipers and when using the OAL gauge instead of measuring from base to tip measure from base to ogive. Much more consistent.
My .204 seems to shoot best in 32 grain with a .015" setback. Experiment and see what your chamber responds to.
Good shooting!

mesillajim · February 24, 2009, 12:37 PM

Patchy:
The Base to Ogive measurements on my CZ .204: 32 Sierra BK is 1.997"; 39 Sierra BK is 1.990". I seat my 32 Sierras at 1.985" (- .015") and with 27.5 H335 five shots measured .472" at 100 yards. Four of the five shots measured an almost unbelievable .198". I have not had anything like that with the 39 grain Sierras.
The cartridge overall length (COAL; OAL) found in the manuals are a reflection of 1) SAMMI specs, and 2) the magazine size in the rifle and do not reflect the leade in the rifle's chambering. My CZ magazine's max OAL is 2.235" which leaves .010" clearance for the bullet tip. It really has nothing to do with the most efficient bullet "jump" to reach the lands. I don't use my magazine as I have replaced it with a CZ 527 Magazine Follower by James Calhoun. That way I can load the cartridge that has the OAL that I want, and I find the single-shot mode is just fine.
Mesillajim

patchy · February 24, 2009, 08:01 PM

mesillajim:Thanks for the info on the oal gauge.Looks like i need to do some shopping.

steve4102 · February 24, 2009, 10:35 PM

Accurate Powder.

SPECIAL NOTE ON CARTRIDGE OVERALL LENGTH “COL”
It is important to note that the SAAMI “COL” values are for the firearms and ammunition manufacturers industry and must
be seen as a guideline only.
The individual reloader is free to adjust this dimension to suit their particular firearm-component-weapon combination.
This parameter is determined by various dimensions such as 1) magazine length (space), 2) freebore-lead dimensions of
the barrel, 3) ogive or profile of the projectile and 4) position of cannelure or crimp groove.

February 23, 2009, 08:23 PM	#1
patchy Junior Member Join Date: January 25, 2009 Posts: 12	204 ruger coal Looking for some ideas on bullet seating.Loading32gr.v max with IMR4895 ,cci450.I cant get bullet close to the lands.Shooting this setup in a t/c encore.

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February 23, 2009, 09:23 PM	#2
rn22723 Junior member Join Date: December 10, 2001 Location: Burbs of Minneapolis Posts: 676	Follow the data in the reloading manual or call up Hornday? Factory chambers are generous. Get a load that works then mess with COAL. Hodgdon Powder Company Cartridge Load Recipe Report - 2/23/2009 data.hodgdon.com 204 Ruger Load Type: Rifle Powder: IMR 4895 Cartridge Information Case: Hornady Barrel Length: 24" Twist: 1:12" Trim Length: 1.840" Primer: Federal 205M 204 Ruger Cartridge Load Data Starting Loads -------------------------------------------------------------------------------- Maximum Loads -------------------------------------------------------------------------------- Bullet Weight (Gr.) Powder Bullet Diam. C.O.L. Grs. Vel. (ft/s) Pressure Grs. Vel. (ft/s) Pressure 32 GR. HDY V-MAX IMR 4895 .204" 2.250" 27.0 3627 40,500 PSI 29.0C 3949 51,900 PSI 35 GR. BER HP IMR 4895 .204" 2.240" 26.5 3550 43,300 PSI 28.3C 3864 55,500 PSI 40 GR. HDY V-MAX IMR 4895 .204" 2.250" 26.0 3415 44,700 PSI 27.8C 3695 56,000 PSI 50 GR. BER HPBT IMR 4895 .204" 2.300" 24.0 3092 45,400 PSI 26.2C 3344 56,000 PSI NEVER EXCEED MAXIMUM LOADS

February 24, 2009, 12:20 PM	#3
mesillajim Junior Member Join Date: February 20, 2009 Posts: 3	Patchy: Get yourself a Stoney Point O.A.L Gauge and the threaded .204 cartridge. You can then use it to measure OAL with each bullet you use. Examples in my CZ .204: With Sierra 32 BK the OAL is 2.447"; with a Sierra 39 BK OAL is 2.441". The OAL measurements will vary slightly due to the variations in the tip conditions (lead tip sometimes is dented; hollowpoints are uneven, etc) so I use what I call the Base to Ogive (BTO) measurement. Get a bullet comparator (Sinclair, Stoney Point, etc) to use with you calipers and when using the OAL gauge instead of measuring from base to tip measure from base to ogive. Much more consistent. My .204 seems to shoot best in 32 grain with a .015" setback. Experiment and see what your chamber responds to. Good shooting!

February 24, 2009, 12:37 PM	#4
mesillajim Junior Member Join Date: February 20, 2009 Posts: 3	Patchy: The Base to Ogive measurements on my CZ .204: 32 Sierra BK is 1.997"; 39 Sierra BK is 1.990". I seat my 32 Sierras at 1.985" (- .015") and with 27.5 H335 five shots measured .472" at 100 yards. Four of the five shots measured an almost unbelievable .198". I have not had anything like that with the 39 grain Sierras. The cartridge overall length (COAL; OAL) found in the manuals are a reflection of 1) SAMMI specs, and 2) the magazine size in the rifle and do not reflect the leade in the rifle's chambering. My CZ magazine's max OAL is 2.235" which leaves .010" clearance for the bullet tip. It really has nothing to do with the most efficient bullet "jump" to reach the lands. I don't use my magazine as I have replaced it with a CZ 527 Magazine Follower by James Calhoun. That way I can load the cartridge that has the OAL that I want, and I find the single-shot mode is just fine. Mesillajim

February 24, 2009, 08:01 PM	#5
patchy Junior Member Join Date: January 25, 2009 Posts: 12	mesillajim:Thanks for the info on the oal gauge.Looks like i need to do some shopping.

February 24, 2009, 10:35 PM	#6
steve4102 Senior Member Join Date: December 23, 2005 Location: Minnesota Posts: 2,952	Accurate Powder. SPECIAL NOTE ON CARTRIDGE OVERALL LENGTH “COL” It is important to note that the SAAMI “COL” values are for the firearms and ammunition manufacturers industry and must be seen as a guideline only. The individual reloader is free to adjust this dimension to suit their particular firearm-component-weapon combination. This parameter is determined by various dimensions such as 1) magazine length (space), 2) freebore-lead dimensions of the barrel, 3) ogive or profile of the projectile and 4) position of cannelure or crimp groove.