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Load development 300 win mag with Sierra TMK 195 bullets

I"m back, Shot under 1/2 " today with 70.4 grains of reader 22 100 yards. Went up to 72.5 and shot 3" at 775 yards . First load was at book Oal. second was .225 over
 
The only TMK's I've worked with are the 30cal 168gr TMK in 308win. I loaded them 0.018" in the lands and used the same load as with regular SMK's and they shot like a benchrest gun from a tactical rifle off bi-pod.

Got some 69gr TMK's to try soon in a 223rem R700 20"bbl.

I tried RL-22 and it was VERY temp sensitive for me to consider using ever again.
My dope changed too much in the same day from mid-day to evening. Colder front moved in and it was around a 20 deg fahrenheit difference in ambient air temp had me dialing more clicks in the evening.
 
Zero333 said:
The only TMK's I've worked with are the 30cal 168gr TMK in 308win. I loaded them 0.018" in the lands and used the same load as with regular SMK's and they shot like a benchrest gun from a tactical rifle off bi-pod.

Got some 69gr TMK's to try soon in a 223rem R700 20"bbl.

I tried RL-22 and it was VERY temp sensitive for me to consider using ever again.
My dope changed too much in the same day from mid-day to evening. Colder front moved in and it was around a 20 deg fahrenheit difference in ambient air temp had me dialing more clicks in the evening.
Click to expand...
I hear you on the RL -22,so what powder did you have the best luck with? I do have some 168 match but have not worked up a load with it
 
muleman69 said:
I hear you on the RL -22,so what powder did you have the best luck with? I do have some 168 match but have not worked up a load with it
Click to expand...

H-4831 always works in my 300 winmags.

With 195 gr bullets 69 to 73 gr H-4831 is a good window to work with.
With 180 grainers 72 to 74 gr of H-4831.

The 168 TMK I mentioned was in a 308win. Sorry for the confusion.

The reason why I mentioned RL-22 is because I really hate chasing my dope. It's a good powder and for short to mid range hunting is no problem. But for target rifles, especially ones that shoot targets at different ranges and first round hits are something to be proud of, the powder has to be stable, or you'll be chasing your tail wondering what's going on.

You can also use H-1000 and try from 75 to 79 gr.
I tried IMR-7977 and it wasn't as accurate as H-4831.
The only powder I tried in any of my 300winmags that shot as good as H-4831 was RL-33, but that was with 240gr SMK. RL-33 is too slow burning for anything lighter than 215 gr in the 300winmag.

Another good stable powder is RETUMBO.
With 208gr ELD-M I settled on 79 gr with 215m primers. CCI-250 primers worked good until I tried the 215m primers and groups got much smaller.

With H-4831 you can use 210M primers instead of 215m if you want. I've tested both and there was no difference in Point of impact and velocity was the same too. Chronoed 10 shot strings and the 215M primers averaged 3 fps faster which is a irrelevant statistical difference in this scenario.
 
Zero333 said:
H-4831 always works in my 300 winmags.

With 195 gr bullets 69 to 73 gr H-4831 is a good window to work with.
With 180 grainers 72 to 74 gr of H-4831.

The 168 TMK I mentioned was in a 308win. Sorry for the confusion.

The reason why I mentioned RL-22 is because I really hate chasing my dope. It's a good powder and for short to mid range hunting is no problem. But for target rifles, especially ones that shoot targets at different ranges and first round hits are something to be proud of, the powder has to be stable, or you'll be chasing your tail wondering what's going on.

You can also use H-1000 and try from 75 to 79 gr.
I tried IMR-7977 and it wasn't as accurate as H-4831.
The only powder I tried in any of my 300winmags that shot as good as H-4831 was RL-33, but that was with 240gr SMK. RL-33 is too slow burning for anything lighter than 215 gr in the 300winmag.

Another good stable powder is RETUMBO.
With 208gr ELD-M I settled on 79 gr with 215m primers. CCI-250 primers worked good until I tried the 215m primers and groups got much smaller.

With H-4831 you can use 210M primers instead of 215m if you want. I've tested both and there was no difference in Point of impact and velocity was the same too. Chronoed 10 shot strings and the 215M primers averaged 3 fps faster which is a irrelevant statistical difference in this scenario.
Click to expand...
Thanks for the great info,Im trying to work up a load with the 195 TMK. I do like the 4831 and 215m and 210 primers
 
IMR 7828 SSC is also a great powder for the .300 Win Mag. I used H1000 for a while and it worked well. However, my accuracy and velocity is better with 7828. Bullets I use are 230 Hybrid, 215 Hybrid, and 208 Amax.
 
JBT said:
IMR 7828 SSC is also a great powder for the .300 Win Mag. I used H1000 for a while and it worked well. However, my accuracy and velocity is better with 7828. Bullets I use are 230 Hybrid, 215 Hybrid, and 208 Amax.
Click to expand...
I have both of those powders, How many grains of 7828 ? Are the Hybrids a Berger Bullet? I see were a lot of folks are using the heaver bullets,what is there reasoning?
 
71.5gr with 215 Berger Hybrid. The heavier Bullets are being used because of the high Ballistic coefficients.
 
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