320pf,

A thread for 300 whisper powders sounds great.....I have been mostly trying super-sonic loads recently and would like to find out what others are trying....If you start the thread I'll contribute what I have to this point....If loads made at sea level +6', 90 degrees, and 80% humidity are of interest...

kurtz

Kurtz,

All loads are of intrest. Check out the new post

320pf

kurtz,

Things seem to be moving along as the reamer is supposed to have just shipped. After rereading I kinda feel bad cause it seems like I stepped on your post somewhat by saying the case may not feed without really knowing if you had solved the mag issue which it seems you have.

My design goal was to keep it all a standard AR changing only the barrel out. In doing this and maintaining the same functionality the cartridge uses same taper and the shoulder is only slightly blown out. Couple of changes were made to the print after it was sent to accomodate those who may want to shoot 155gr palma match bullets although I intended it mainly for 125gr loads so only testing will tell. Internal ballistic software shows 2600+ fps with the 125s at 55000 psi but I have learned that computer software just can't figure all the variables so I no longer put much stock in the numbers just a reference.

320pf,

I will second your finding on lil' gun generating some of the highest velocities with the lowest pressure signs. One of the best double base powders I have used as far as velocity goes. Got to admit though I am a little single minded (BR shooter) and I still like the extruded single base powders even though the velocity is down. I hope to get you that 20" barrel data with the 155gr SPMs but it may be a little while as I am starting a new job.

if anyone is interested in cutting a 300 whisper chamber for super-sonic loads there is a reamer listed on ebay....

http://cgi.ebay.com/ws/eBayISAPI.dll...MESE:IT&ih=015

super-sonic 300 whisper range results
 

went to the range today to try a few super sonic loads: 24" 1:11 CZ527

19gr 4895 125gr nosler BT 1.605" at ogive = 1505 fps
19gr 1680 125gr nosler BT 1.605" at ogive = 2125 fps
19gr H110 125gr nosler BT 1.605" at ogive = 2375 fps
19gr lil'gun 125gr nosler BT 1.605" at ogive = 2470 fps

20gr 1680 125gr nosler BT 1.605" at ogive = 2160 fps
20gr H110 125gr nosler BT 1.605" at ogive = 2450 fps
20gr lil'gun 125gr nosler BT 1.605" at ogive = 2565 fps

found that loads of H110 that would shoot over 2500 fps on 90 degree days were over 100 fps slower on a 70 degree day....1680 loads we around 75 fps slower.....

this was my first experience with lil'gun, wanted to wait til fall/winter to try....very tight deviation and groups in the 20gr loads, as little as 6 fps in three round strings......the deviation was greater in the lower charge loads, around 35 fps.....velocity was good and pressure signs were OK....shot (5) 3 round clovers at 100 yds.....looks like it will be my go to powder for the winter time..........

kurtz