Problems

[Finney]

First I am a new member here. I have been lurking for a while and decided to join.
I have a 243 that I had built in 1974 on a Mauser action. It had a 30in Federal barrel with a 1 in 10 twist. Last years prairie dog hunt finished off the barrel.
I sent it to Douglas for a new barrel. 24in 1 in 12 twist.,At my age I like the less weight)Same contour as the old one. I then had it rebedded.
I started working up loads for it. The best I got was, 70gr BlitzKing 36.5gr 4064 Winchester primers = .52 group. 85gr BTHP Sierra 43.5gr IMR4350 Winchester primers = .71 group.
I ran out of the Winchester primers and the only thing avaiable were MagTech. I loaded some with the MagTech and the groups went to 1-1/2'
Am I missing something or can primers make that much difference?

 

[Preacher]

Some guns like a particular primer, and it seems to show up in yours...

 

[gambleone]

Finney,
You might try cci-br2 or federal 210m. I wouldn't give up on the barrel yet. There are more combinations to try.

 

[Finney]

Thanks guys, Winchester are not avaiable here. I found some CCI/BR. I will pick tem up today.

 

[Winchester69]

Winchester primers are hotter than other brands. Re-tune your loads by adjusting the powder; it may come around.