[mrm14]

I'm setting up to shoot 210 gr. Berger Target BT Long Range bullets in my 300 Win. Mag. target rifle. I'll be using IMR 4350 and IMR 7828ssc as I develop my load. It has also been suggested by a couple of shooting club members that I also try RE-22.

The rifle has been done since early in Feburary this year but with the work load I'm under now, all I've had time to do is work eat and sleep. (10 to 12 hour days, 6 to 7 days a week) I havn't even had time to break in the barrel yet.

I'm curious; Were you using H1000 only for your 210 gr. loads?

[Silvertip 44]

Yes, mrm14, H1000 is all that I have loaded with at this time and I have stuck with the 165 gr. Accubond. I have a pound of RL 22 and a pound of H4831 but have not tried them yet.
I will be having surgery for a right salivary gland tumor on the 29th so that will probably slow me down for a while on the recoiling rifles.
I have had good luck with both Winchester Magnum primers and CCI Mag primers. I tried some Federal, Winchester and CCI large rifle primers and they won't shoot good groups. After my rt jaw recovers I will start with 180 gr. Accubonds.
I have had a lot of comments that H1000 and RL 22 are two of the better powders for the .300.
Primers seem to be a big influence on group size. I have plenty of Winchester Mags but the only other in decent supply is Remington 91/2 Mags. I hate like the devil to buy 1000 of them and then find they don't group well. CCI seems to be the best and then Winchester.
When you develop a good load PM me and tell me about it. Working with the .300 is all new ground for me.