Hi all,
I've got a ruger precision rifle in 6.5 creedmoor that I've been playing with. I'm shooting 147 ELDM with RL17, hornady brass, RWS large rifle primers from 1977 all seated to 2.840" (longest the stock magazine will allow, but jumping maybe .090" or more).
My ladder up to 42gr resulted in no measurable case head growth or flattening of the primers, but the cratering and primer extrusion into the pin hole gets worse as I go up. 40.5gr is 2670fps, 41gr is 2700, 41.8 is 2750, 42 was 2770. I stopped there because the craters were standing 0.020" proud at that point and I didn't want to risk piercing a cup. I've got some Fed 210 and some CCI 250 magnum primers in hand for other guns and thought I'd give them a try here. Any advice on how much to dial it down for the change in primers? Would a few tenths be ok? Ladder from 41.5 on up for each primer again?
At 40.3, 41, and 41.7 it groups pretty nice: holding 0.5MOA out to 800yards (furthest I've gone so far on paper) with single digit SD and low teens for ES. I've been very pleased with it. It's very rewarding to shoot the 6.5 Creedmoor with this rifle platform after spending more than a decade behind a 300 Savage in a Mauser 98 hunting rifle shooting 155s at 2600fps. Feels almost like cheating.
The thing is a laser beam as far as I'm concerned!
On a related note, does anyone know if Greg (GreTan) can bush the rpr bolts? He's not too far from me. If no one knows, I'll get in touch with him.
Thanks
I've got a ruger precision rifle in 6.5 creedmoor that I've been playing with. I'm shooting 147 ELDM with RL17, hornady brass, RWS large rifle primers from 1977 all seated to 2.840" (longest the stock magazine will allow, but jumping maybe .090" or more).
My ladder up to 42gr resulted in no measurable case head growth or flattening of the primers, but the cratering and primer extrusion into the pin hole gets worse as I go up. 40.5gr is 2670fps, 41gr is 2700, 41.8 is 2750, 42 was 2770. I stopped there because the craters were standing 0.020" proud at that point and I didn't want to risk piercing a cup. I've got some Fed 210 and some CCI 250 magnum primers in hand for other guns and thought I'd give them a try here. Any advice on how much to dial it down for the change in primers? Would a few tenths be ok? Ladder from 41.5 on up for each primer again?
At 40.3, 41, and 41.7 it groups pretty nice: holding 0.5MOA out to 800yards (furthest I've gone so far on paper) with single digit SD and low teens for ES. I've been very pleased with it. It's very rewarding to shoot the 6.5 Creedmoor with this rifle platform after spending more than a decade behind a 300 Savage in a Mauser 98 hunting rifle shooting 155s at 2600fps. Feels almost like cheating.

On a related note, does anyone know if Greg (GreTan) can bush the rpr bolts? He's not too far from me. If no one knows, I'll get in touch with him.
Thanks