243 powder

If you shoot in the summer heat then H4350 is your best bet but if speed is what you are after Reloder 26 will be king but it can spike pressure above 85 F
 
H414 with a 100 Hornady BTSP works in most of the guns I loaded for. Kills deer super good.
 
I currently have three .243 rifles. Two have 1-9" twist, and the custom, long range one has 1-8" twist. All three show excellent accuracy with 100 grain bullets. The 1-8" barrel shows superb accuracy with 108 grain Sierra or Bergers. I've loaded Win 760 under hunting bullets and H4350 under the 108s. I can't complain about either powder. Both do their job, but if faced with temperature extremes, I'd go with the H4350. -Ed
 
R#26 with CCI 250, 100g Hornady btsp will be all over 3200 fps if not a tad more, depending on your barrel length.

In my bone stock Remington 243's, I use a load of IMR or H4350 with the 100g Hornady BTSP, accuracy will be at a max load for the rifle. The Hornady 100g btsp is a great bullet for the larger hogs and deer in your 9T barrel.
 
I am working up loads for my 243 that I just finished up building. I have a McGowan 24 inch barrel with a 1-9 twist and I am thinking about 80 to 100 grain bullets for deer. What powder do you guys use I am thinking IMR 4350 or H 4350.
Either one of the 4350's will perform well in the your .243 My Remington Model Seven (short barrel) likes 38.5 gr of IMR4350 and 38.2 gr of H4350 with 100 gr Nosler Partitions CCI200 primers and Federal Brass. Very accurate, sub MOA at 200yds with a very similar POI.
 
I dialed in my rifle for 100 gr spbt using hybird 100v, ramshot hunter, and superformance. I use 87 gr V-max for varminting. I have a 9.125 twist and 26 inch barrel Holland brake. 8 X 32 60mm

Mule deer and antelope have always been DRT with one shot. I did lots of chrono and paper time and dialed the 100 grain back to 3100 fps to make it easier to print out ballistic charts for the elevation and temp... I would be hunting at. Laser range finders really help

 

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I am working up loads for my 243 that I just finished up building. I have a McGowan 24 inch barrel with a 1-9 twist and I am thinking about 80 to 100 grain bullets for deer. What powder do you guys use I am thinking IMR 4350 or H 4350.
I worked up a load with Reloader 26, 100 grain Hornady BTSP. I have a 22" Hart barrel. I am a grain below max from what Alliant data recommends and the load is chronographed at 3133 and shoots just over .5" at 100. I took an antelope this past season and the temperature was in the high 90's and had no pressure spikes.
 
Bought me a Remington 700 in a 243 to build a custom rifle out of and was curious as to how it would shoot. With 4064 and 65 gr hornady bt it shot two in one hole and the third one not quite touching. The 100gr hornady sp with reloader 19 not so good in fact it was awful. Might try some 4831 and seat closer to rifling.
 
I am working up loads for my 243 that I just finished up building. I have a McGowan 24 inch barrel with a 1-9 twist and I am thinking about 80 to 100 grain bullets for deer. What powder do you guys use I am thinking IMR 4350 or H 4350.
My 2 loads for pre-64 Model 70 243:
IMR 4350, 46.5 gn & 70 gn Sierra Blitzking @ 3280 fps; Also IMR 4350, 42.5 gn & 95 gn Nosler Ballistic tip @ 2970 fps. Just FWIW!
 

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