range results 7x57 Rolling block

[atr]

I shot this 10 shot group yesterday morning using a #5 Rem Rolling Block and 160 gr cast with 16 gr of 2400.271786271787
271788

the range was 50 yards. My eye sight is not as good as it used to be!

atr

I USED A LYMAN MOLD #287308 / 162 GR / SIZED 0.286

[El Gato]

Nice shooting!

Which mold did you use and what size were the bullets?

I have had luck with Lyman 287405 bullets sized to .288 in my Venezuelan and Chilean Mausers.

[Der Gebirgsjager]

Nothing to complain about there! Good shooting!

DG

[koger]

I am currently loading some 168gr out of my RCBS mold to try in my 7x57 Rolling block. Mine has a mint bore, an am anxious to see how it shoots with cast.

[broomhandle]

Hi atr,

Did you use standard 7 mm & fire form it with this load?

Did you take the extra step to resize it to 30 cal. & reduce back to 7mm to better fill in the overbore pre SAMMI chamber specs. in the Rolling block barrel?
The first time I shot the #5 I was VERY surprised with the now double neck ion the case! I found out here, it was normal! I read some were on line the Rolling block 7mm bullet will be more accurate with the second step as it fills the chamber better. Your thoughts?

This is a on going project for me. so your input & other peoples thoughts are very helpful to me.

Thanks in advance for getting me back on track,
broom

[El Gato]

Awesome shooting!

[atr]

trying to answer the questions from broomhandle:
1. The brass was fire formed and then just neck sized.
2. I did NOT resize to 30 cal. and I have not had a problem with the double neck you mentioned
3. when I seat the boolits I seat them just short of the rifling. Bear in mind that the RRB's have a long throat so long boolits work best.
4. the boolits are seated in two steps: first I seat for overall length NO Crimping. the second step is the crimp so I back off the seating depth and screw the die down until the crimping action is engaged. I think that getting a good, uniform crimp is a key to accuracy.
I hope this helps

as an aside, I did shoot the second half of the box of 20 shooting at red clay disks at 100 yds. Those disks, the ones the shotgunner use for practice measure a little over 3" in diameter, and I found that I could hit them easily at the 100 yd range.
atr

[broomhandle]

Hi atr,

I'm told my RB is a later model 1910 as it has a band front sight. I'll try your loads soon & get back to you.
If you have the time, can you post a picture or two of your fired cases? It would be a big help to me.

Thanks for your reply,
broom