357Mag
11-01-2012, 12:41 AM
Hey kids -
... .You say.... .35 Rem brass is gettin' harder to find... and ...you just cracked the
neck on one. Is THAT what's botherin' you... Bunkie ?!
" WELL... cheer up..... and take a walk in the sun " !
Just for grins, I took the neck clean-off the case, and ran w/ a bullet that has a
"rebated" boat tail. The idea being, have the flat surfce of the bullet base at the top of the boat tail; serve as the gas sealing point.
The bullet is from " Dead Center Duplex", and is their .357" calibre swaged
195 SPBT. These I pulled from a 12ea scab pack of .45cal sabotted ML rounds.
I patched w/ nylon self-stick "Dymo" label maker tape, after recalling fomer
S & W " Nyclad " ammo.
The question was combustion:
I figured I'd need the bullets jammed into the lands, in-order to do what I could to aid in dependable ignition/combustion. DCD's 175SPBTs do not reach the lands; even when fairly-thickly patched. The 195SPBTs DO.
The top of the boatail ( both weights ) runs .310".
Fortunately for me, my custom RCBS case forming die set to make .22-35 wildcat brass... includes a first-step .308" neck-down die.
I cut-off the cracked portion of the case' neck, tamped the shoulder of the case
w/ the .308 neck-down die; and trimmed in my Wilson case trimmer ve-wee
ve-wee care-fo-weee... to arrive @ a case mouth opening of .310". But most of all..... a good, flat/square case mouth opening. Then, I made another 5...
so that I could group test.
Since I was out in La La Land, I decided to try a conservative initial load of
16.2gr IMR4759 and Rem 91/2 ( based on experiences shooting 140 & 150gr
"J-words" w/ reduced IMR4759 charges @ 100.
I pushed a thin tripled-up layer of tissue paper over the powder, and then filled each case w/ "PuffLon" ; until the stuff would end up being compressed by the seated 195s.
I rushed to the range, in-time to make only the final 2 ( approx 15min ) relays.
First relay, I shot a trial "J"-word loads... 140 FTX over 17.1gr IMR4759.
Second relay, it was Scheutzen city, while I single-loaded each bulleted case;
w/ the 195s dangling near out of the case mouths. Aaacckkk ! Wished I had taken time to fashion a makeshift breech seater tool for the bullets, out of the plastic bullet seater tip DCD includes in their 12pac !
With the clock running out, I machine-gunned 5-shots 100yds down range; w/o any regard for watching the windlflag I had set-out earlier. Last shot landed 15 sec before the "cease fire ".
" Tell him what he won, Bob":
I was suprised to find the 195s shot some 12" higher @ 100 than the 140FTX loads ! I also pulled-off a 2.13" 5-shot group, one shot going rather wide.
- The 16.2gr load had fine pressure indications, and the fired cases don't emerge
sooty on their shoulders.
- Cases were all previously fire-formed,
and NOT FL sized.
- Chamber did not strike me as being overly dirty, atall ( 5 shots )
Next time out:
- Breech seater tool for the bullets
- Higher powder charge(s)
- Watch the flag
- Take more time
Film @ 11:00....
Regards,
357Mag
... .You say.... .35 Rem brass is gettin' harder to find... and ...you just cracked the
neck on one. Is THAT what's botherin' you... Bunkie ?!
" WELL... cheer up..... and take a walk in the sun " !
Just for grins, I took the neck clean-off the case, and ran w/ a bullet that has a
"rebated" boat tail. The idea being, have the flat surfce of the bullet base at the top of the boat tail; serve as the gas sealing point.
The bullet is from " Dead Center Duplex", and is their .357" calibre swaged
195 SPBT. These I pulled from a 12ea scab pack of .45cal sabotted ML rounds.
I patched w/ nylon self-stick "Dymo" label maker tape, after recalling fomer
S & W " Nyclad " ammo.
The question was combustion:
I figured I'd need the bullets jammed into the lands, in-order to do what I could to aid in dependable ignition/combustion. DCD's 175SPBTs do not reach the lands; even when fairly-thickly patched. The 195SPBTs DO.
The top of the boatail ( both weights ) runs .310".
Fortunately for me, my custom RCBS case forming die set to make .22-35 wildcat brass... includes a first-step .308" neck-down die.
I cut-off the cracked portion of the case' neck, tamped the shoulder of the case
w/ the .308 neck-down die; and trimmed in my Wilson case trimmer ve-wee
ve-wee care-fo-weee... to arrive @ a case mouth opening of .310". But most of all..... a good, flat/square case mouth opening. Then, I made another 5...
so that I could group test.
Since I was out in La La Land, I decided to try a conservative initial load of
16.2gr IMR4759 and Rem 91/2 ( based on experiences shooting 140 & 150gr
"J-words" w/ reduced IMR4759 charges @ 100.
I pushed a thin tripled-up layer of tissue paper over the powder, and then filled each case w/ "PuffLon" ; until the stuff would end up being compressed by the seated 195s.
I rushed to the range, in-time to make only the final 2 ( approx 15min ) relays.
First relay, I shot a trial "J"-word loads... 140 FTX over 17.1gr IMR4759.
Second relay, it was Scheutzen city, while I single-loaded each bulleted case;
w/ the 195s dangling near out of the case mouths. Aaacckkk ! Wished I had taken time to fashion a makeshift breech seater tool for the bullets, out of the plastic bullet seater tip DCD includes in their 12pac !
With the clock running out, I machine-gunned 5-shots 100yds down range; w/o any regard for watching the windlflag I had set-out earlier. Last shot landed 15 sec before the "cease fire ".
" Tell him what he won, Bob":
I was suprised to find the 195s shot some 12" higher @ 100 than the 140FTX loads ! I also pulled-off a 2.13" 5-shot group, one shot going rather wide.
- The 16.2gr load had fine pressure indications, and the fired cases don't emerge
sooty on their shoulders.
- Cases were all previously fire-formed,
and NOT FL sized.
- Chamber did not strike me as being overly dirty, atall ( 5 shots )
Next time out:
- Breech seater tool for the bullets
- Higher powder charge(s)
- Watch the flag
- Take more time
Film @ 11:00....
Regards,
357Mag