UPDATE 300 win mag better accuracy

[addicted]

immediately after shooting open the bolt so that the barrel cools evenly from both ends.

[bobcat]

It is a good idea to do your shooting when temperatures are low. That helps a lot with shortening the amount of time you need to wait between groups. I always like to go as early in the morning as I can. And, like jackelope said, always have at least two rifles to shoot, so one can cool while you're shooting the other.

[fremont]

I think there are better bedding instructions out there.... 

[CAMPMEAT]

Buy a T/C Encore 300 mag.....

[addicted]

buy a TRG 300 win mag

[grizzlyadams]

What brand is the rifle. I own a Tikka 300 WM and the thing is a tack driver at 200 yards even while hot. I can put about 12 rounds down range at a slow pace within each range session on a cool fall day with no problems with heating poi. Some barrels are made out of high grade material. Some are not. The cheaper the barrel, the more cooling is required. Higher grade barrels are made from steel that disapate heat very quckly and hold true when heated. Also, the flinch factor is a huge concern with a 300. I have to really concentrate and will often put a sand bag between my shoulder and the butt when my shoulder begins to get sore.