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Does anyone have good load data for .243 Sierra 100 grain spitzer with either IMR 4895 or H380? Any reliable info would be appreciated.
 

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The Troll Whisperer (Moderator)
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Have you checked your loading manual(s)?
 

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Welcome to ShootersForum, Lowndleft.

The 3rd edition of the Sierra manual shows the following loads for 243 with their 100gr bullets:

IMR4895 -- 31.5 starting charge : 36.2 maximum charge
H380 -- 32.8 starting charge : 36.4 maximum charge

Both powders fall short of best velocity as they are a little too fast for this cartridge capacity and bullet weight combination. They would be better with lighter bullets. Pick a flavor of 4350, 4831, or maybe RL19 for better performance.
 

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The Sierra fifth edition shows a starting load of 31.6 grns. and max at 36.2 for imr 4895
and a starter at 32.8 max at 35.3 for h 380. I don't use either of these powders with 100 grn bullets so use caution when working up towards max (read the sticky above on pressure signs). Hope this helps.
 

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My 243 loves Winchester WXR [Rel-22] under the 100 gr Gameking. Out of a 20" barrel I get 3000fps and MOA sized groups.
 

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Welcome to ShootersForum, Lowndleft.

The 3rd edition of the Sierra manual shows the following loads for 243 with their 100gr bullets:

IMR4895 -- 31.5 starting charge : 36.2 maximum charge
H380 -- 32.8 starting charge : 36.4 maximum charge

Both powders fall short of best velocity as they are a little too fast for this cartridge capacity and bullet weight combination. They would be better with lighter bullets. Pick a flavor of 4350, 4831, or maybe RL19 for better performance.
I agree. I use IMR-4895 for my 85 grs. When shooting 100's, I have found that IMR-4350 works great! If a .243 won't shoot with one of these powders, taking into account bullet weight, I'd be surprised. These two powders seem like they were made for this caliber.
 

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I've was thinking IMR 4064. I've had very good results in cartridge cases of this size with it and has worked very well in my 358 Win and 35 Rem.

When I looked in my Sierra manual ironically it's the powder they recommend as a hunting load (36.2 grns for 2900 fps). They start at 30.7 grns and max at 36.2. TAC would be another I would try.
 

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The most accurate combination I've found is Reloader 17 and Nosler 95 grain Ballistic Tips seated .010 off the lands.
 

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My M77 (which is the only decent-shooting Ruger I've ever fired.) loves a max charge of H414 with 100 grainers.
 

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If you want to try something else for powder, I load IMR 4831 behind a 100Gr Sierra Gameking for my son's M77. Supposedly it shoots MOA in his Ruger and and even better in his buddy's M700.
 
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