At the range with the 257 Roberts

[Alderman]

The group at the left is the last of my first attempt with the Nosler 115 Ballistic Tip. I'm going to up the powder and see what happens with these.
The group at the top is some old reloads with the Nosler 100 Ballistic Tip. They were my go to load when I drew an Antelope tag.
Having fun this week playing in the reloading room.

So I added some more powder---CAUTION!!! Max book load
And seated the bullets longer---CAUTION!!!! Longer than book loads. Thanks to a recommendation from a fellow member of this site.
Fired three and see this improvement. Will need to shoot again to verify. This is certainly good enough for deer hunting out here where the shots are usually 200 yards or less.

 

[DrMike]

The old load certainly sets a high standard for the rifle. You'll find the load that works, without a doubt.

 

[Alderman]

I hope I'm on the right track now.

 

[OU812]

Great looking groups with both bullet weights.

 

[Darkhorse]

True, both are good looking groups. But I would be more comfortable in knowing exactly what the OAL is to my lands, then adjusting your seating depth from that known dimension. You don't want to jam a bullet well into the lands with a hot load.

 

[Alderman]

I could be wrong so feel free to school me on this. The loads cycle through the gun with no sign of the bullet ogive hitting the lands, the fired cases don't show excessive pressure signs. I'm thinking I'm good to go with these, but don't want to blow myself up.

 

[gerry]

I could be wrong so feel free to school me on this. The loads cycle through the gun with no sign of the bullet ogive hitting the lands, the fired cases don't show excessive pressure signs. I'm thinking I'm good to go with these, but don't want to blow myself up.

Sounds like you are good to go, both the 100 and 115 gr BT look very good. Great shooting.

 

[JD338]

Nice. You are on your way to making her sing. Seat them out farther. The 700 classic is a long action with a long throat. You should be able to get to a COL of 2.900" with ease.
Keep listening to the fellow forum member, he knows the 257 Bob.

JD338

 

[gerry]

Yes the above "fellow forum member" has some experience with the Bob in the great Rem 700 classic....... :lol:

 

[Alderman]

The last target is with the COL at 2.905.

 

[JD338]

The last target is with the COL at 2.905.

Take a fired case and push the case mouth on a hard surface to make it slightly out of round. Seat a bullet into the case mouth to a COL over 3.00 inch and carefully chamber the dummy round. The bullet should make contact with the lands and push it deeper into the case. Carefully remove the dummy round and measure the COL. You might want to do this 3-5 times to ensure you are getting the same COL. Once done, you will have the true COL to the lands. Then all you have to do is subtract .015" and you will know how far you are off the lands.

Here is what I am getting with my Bob.

JD338

 

[Darkhorse]

That's the method I use to establish my measurement to the lands. You can go a step further and purchase a bullet comparator. This measures off the ogive right where the bullet contacts the lands.
All my seating depths are measured off the rifling using a comparator.
If you change bullets it's worth rechecking this distance as bullet shapes will change somewhat.

 

[JD338]

Its the poor man's comparator method.

JD338

 

[SJB358]

Very nice! Great shooting. Man, I need to quit looking at all of these fabulous 257's!