unexplained high velocity with H335 and damage.

Quote:further ..... when playing any "chase the lands" type of game, you first need to work from a standard COAL to determine whats safe at those lengths - and then SLOWLY and extremely carefully adjust your COAL from there. Preferably after measuring where exactly the lands make contact with the Ogive of the bullet with a comparator and a COAL type gauge.

so can you give us the CBTO max length to lands in your rifle with the 69 SMK? and what was the CBTO of the cartridges you loaded?


^^^^^^^^^^^^This. Stated much more succinctly than my rambling attempt!

Regards,
hm
 
Originally Posted By: Plant.One
further ..... when playing any "chase the lands" type of game, you first need to work from a standard COAL to determine whats safe at those lengths - and then SLOWLY and extremely carefully adjust your COAL CBTO from there.

i would like to clarify a bit on this, since i posted in the wee hours of the AM last night...

fist off - i should have said adjust your CBTO and not COAL. Use book COAL for your starting point and then get your baseline CBTO from there. bullet design does not lend to enough consistency to use the COAL measurement for this adjustment. even high quality bullets can have a +/- .005 base to tip OAL measurement.

when i say slowly and extremely carefully... i'm talking .001 adjustments on your CBTO and ONLY your CBTO as measured with a comparator.


sorry for the mixup there. i hope i have clarified sufficently. ( i will edit my post to reflect the CBTO vs the COAL in the amended section of my quote above)
 
I want to thank all those who trusted me and suggested bore obstruction or chamber problem. I will also thank the others, who were after all just trying to help. I took the upper to an old time smith for bore scope job. I explained that I had overpressure issues and was confident in my reloading. He asked as did someone else along the line, are your cases too long. No. 1.75. He said I'll shoot some of my loads in it. I told I was pretty confident that it wasn't me and please bore scope first, then shoot it if wanted to. He said huh, and held it up to the window and looked down the the chamber. Then he said , Oh god no, you don't want to shoot this. Something is very wrong. Don't know exactly what yet
 


Write your reply...
Back
Top